opinion: Adaucto CHAVEZ-MEZA, Petitioner
  v.
  UNITED STATES.
  No. 17-5639.
  Supreme Court of the United States
  Argued April 23, 2018.
  Decided June 18, 2018.
  Todd A. Coberly, Santa Fe, NM, appointed by this Court, for Petitioner.
  Rod J. Rosenstein, Baltimore, MD, for Respondent.
  Jeffrey T. Green, Derek A. Webb, Sidley Austin LLP, Washington, D.C., Sarah O'Rourke Schrup, Northwestern Supreme Court Practicum, Steven J. Horowitz, Sidley Austin LLP, Chicago, IL, Todd A. Coberly, A. Nathaniel Chakeres, Coberly & Martinez, LLLP, Santa Fe, NM, for Petitioner.
  Noel J. Francisco, Solicitor General, John P. Cronan, Acting Assistant Attorney General, Eric J. Feigin, Morgan L. Goodspeed, Assistants to the Solicitor General, Alexander P. Robbins, Attorney, Department of Justice, Washington, D.C., for Respondent.
  Justice BREYER delivered the opinion of the Court.
  This case concerns a criminal drug offender originally sentenced in accordance with the Federal Sentencing Guidelines. Subsequently, the Sentencing Commission lowered the applicable Guidelines sentencing range; the offender asked for a sentence reduction in light of the lowered range; and the District Judge reduced his original sentence from 135 months' imprisonment to 114 months'. The offender, believing he should have obtained a yet greater reduction, argues that the District Judge did not adequately explain why he imposed a sentence of 114 months rather than a lower sentence. The Court of Appeals held that the judge's explanation was adequate. And we agree with the Court of Appeals.
  I
  A
  The Sentencing Guidelines require a sentencing judge to consider certain listed characteristics of the offender and the offense for which he was convicted. Those characteristics (and certain other factors) bring the judge to a Guidelines table that sets forth a range of punishments, for example, 135 to 168 months' imprisonment. A sentencing judge often will choose a specific penalty from a Guidelines range. But a judge also has the legal authority to impose a sentence outside the range either because he or she "departs" from the range (as is permitted by certain Guidelines rules) or because he or she chooses to "vary" from the Guidelines by not applying them at all. See United States v. Booker, 543 U.S. 220, 258-265, 125 S.Ct. 738, 160 L.Ed.2d 621 (2005) (holding the Sentencing Guidelines are advisory). The judge, however, must always take account of certain statutory factors. See 18 U.S.C. § 3553(a) (requiring the judge to consider the "seriousness of the offense" and the need to "afford adequate deterrence," among other factors). And, of particular relevance here, the judge "shall state in open court the reasons for [the] imposition of the particular sentence." § 3553(c). If the sentence is outside the Guidelines range (whether because of a "departure" or a "variance"), the judge must state "the specific reason for the imposition of a ... different" sentence. § 3553(c)(2). If the sentence is within the Guidelines range, and the Guidelines range exceeds 24 months, the judge must also state "the reason for imposing a sentence at a particular point within the range." § 3553(c)(1).
  B
  We here consider one aspect of the judge's obligation to provide reasons. In an earlier case, we set forth the law that governs the explanation requirement at sentencing. In Rita v. United States, 551 U.S. 338, 127 S.Ct. 2456, 168 L.Ed.2d 203 (2007), the offender sought a downward departure from the Guidelines. The record, we said, showed that the sentencing judge "listened to each argument[,] ... considered the supporting evidence[,] ... was fully aware of defendant's various physical ailments[,]" imposed a sentence at the bottom of the Guidelines range, and, having considered the § 3553(a) factors, said simply that the sentence was " 'appropriate.' " Id., at 358, 127 S.Ct. 2456. We held that where "a matter is as conceptually simple as in the case at hand and the record makes clear that the sentencing judge considered the evidence and arguments, we do not believe the law requires the judge to write more extensively." Id., at 359, 127 S.Ct. 2456.
  We also discussed more generally the judge's obligation to explain. We wrote that the statute calls
  "for the judge to 'state' his 'reasons.' And that requirement reflects sound judicial practice. Judicial decisions are reasoned decisions. Confidence in a judge's use of reason underlies the public's trust in the judicial institution. A public statement of those reasons helps provide the public with the assurance that creates that trust." Id., at 356, 127 S.Ct. 2456.
  But, we continued,
  "we cannot read the statute (or our precedent) as insisting upon a full opinion in every case. The appropriateness of brevity or length, conciseness or detail, when to write, what to say, depends upon circumstances. Sometimes a judicial opinion responds to every argument; sometimes it does not; sometimes a judge simply writes the word 'granted' or 'denied' on the face of a motion while relying upon context and the parties' prior arguments to make the reasons clear. The law leaves much, in this respect, to the judge's own professional judgment." Ibid.
  At bottom, the sentencing judge need only "set forth enough to satisfy the appellate court that he has considered the parties' arguments and has a reasoned basis for exercising his own legal decisionmaking authority." Ibid.
  When a judge applies a sentence within the Guidelines range, he or she often does not need to provide a lengthy explanation. As we said in Rita, "[c]ircumstances may well make clear that the judge rests his decision upon the Commission's own reasoning that the Guidelines sentence is a proper sentence (in terms of § 3553(a) and other congressional mandates) in the typical case, and that the judge has found that the case before him is typical." Id., at 357, 127 S.Ct. 2456.
  We have followed this same reasoning in other sentencing cases, including Gall v. United States, 552 U.S. 38, 128 S.Ct. 586, 169 L.Ed.2d 445 (2007), which we decided the same year as Rita . Cf. Kimbrough v. United States, 552 U.S. 85, 109, 128 S.Ct. 558, 169 L.Ed.2d 481 (2007) (suggesting a district judge's decision to vary from the Guidelines range may be entitled to greater respect when the judge finds a particular case " 'outside the "heartland" ' " of the Guidelines). Indeed, the case before us differs from the Guidelines cases that Rita describes in only one significant respect. It concerns a limited form of re sentencing.
  C
  The relevant lower court proceedings are not complicated. In 2013, petitioner pleaded guilty to a federal crime, namely, possessing methamphetamine with the intent to distribute it. The judge reviewed the Guidelines, determined that the applicable range was 135 to 168 months' imprisonment and imposed a sentence at the bottom of that range: 135 months. Pursuant to its statutory authority, the Sentencing Commission subsequently lowered the relevant Guidelines range from 135 to 168 months to 108 to 135 months. United States Sentencing Commission, Guidelines Manual App. C, Amdt. 782 (Supp. Nov. 2012-Nov. 2016) (USSG); see also 28 U.S.C. § 994(o ). Petitioner then sought and obtained a sentence modification. See 18 U.S.C. § 3582(c)(2) ; USSG § 1B1.10. He asked the judge to lower his sentence to the bottom of the new range, namely 108 months. But the judge instead lowered it to 114 months, not 108 months. The order was entered on a form issued by the Administrative Office of the United States Courts. The form certified the judge had "considered" petitioner's motion and "tak[en] into account" the § 3553(a) factors and the relevant Guidelines policy statement. App. 106-107 (under seal).
  Petitioner appealed, claiming that the judge did not adequately explain why he rejected petitioner's 108-month request. The Court of Appeals rejected his argument. 854 F.3d 655 (C.A.10 2017). In its view, "absent any indication the court failed to consider the § 3553(a) factors, a district court ... need not explain choosing a particular guidelines-range sentence." Id., at 659. Petitioner sought certiorari, and we granted his petition.
  II
  A
  The Government, pointing out that this is a sentence-modification case, argues that this fact alone should secure it a virtually automatic victory. That is because, unlike an ordinary Guidelines sentencing case, the statute governing sentence-modification motions does not insist that the judge provide a "reason for imposing a sentence at a particular point within the range." Compare § 3553(c)(1) with § 3582(c)(2). It adds that sentence modifications also differ procedurally from sentencing in that the offender is not entitled to be present in court at the time the reduced sentence is imposed. See Dillon v. United States, 560 U.S. 817, 828, 130 S.Ct. 2683, 177 L.Ed.2d 271 (2010) (citing Fed. Rule Crim. Proc. 43(b)(4) ). As we have said before, "Congress intended to authorize only a limited adjustment to an otherwise final sentence and not a plenary resentencing proceeding." Dillon, supra, at 826, 130 S.Ct. 2683. These procedural features, the Government asserts, mean that "the court has no duty" to provide an "on-the-record explanation" of its reasons. Brief for United States 12, 19.
  We need not go so far. Even assuming (purely for argument's sake) district courts have equivalent duties when initially sentencing a defendant and when later modifying the sentence, what the District Court did here was sufficient. At the original sentencing, the judge "must adequately explain the chosen sentence to allow for meaningful appellate review." 552 U.S., at 50, 128 S.Ct. 586 ; see also Rita, 551 U.S., at 356, 127 S.Ct. 2456 ("The sentencing judge should set forth enough to satisfy the appellate court that he has considered the parties' arguments and has a reasoned basis for exercising his own legal decisionmaking authority"). Just how much of an explanation this requires, however, depends, as we have said, upon the circumstances of the particular case. Id., at 356-357, 127 S.Ct. 2456. In some cases, it may be sufficient for purposes of appellate review that the judge simply relied upon the record, while making clear that he or she has considered the parties' arguments and taken account of the § 3553(a) factors, among others. But in other cases, more explanation may be necessary (depending, perhaps, upon the legal arguments raised at sentencing, see id., at 357, 127 S.Ct. 2456 ). That may be the case even when there is little evidence in the record affirmatively showing that the sentencing judge failed to consider the § 3553(a) factors. If the court of appeals considers an explanation inadequate in a particular case, it can send the case back to the district court for a more complete explanation. Cf. Molina-Martinez v. United States, 578 U.S. ----, ----, 136 S.Ct. 1338, 1348, 194 L.Ed.2d 444 (2016) ("[A]ppellate courts retain broad discretion in determining whether a remand for resentencing is necessary").
  B
  Petitioner argues that the judge should have explained more here because there is, or should be, some kind of presumption that the judge will choose a point within the new lower Guidelines range that is "proportional" to the point previously chosen in the older higher Guidelines range. We are not aware of any law or any convincing reason, however, suggesting that this is so.
  As a technical matter, determining just what "proportionality" means in this context would often prove difficult when the sentence is somewhere in the middle of the Guidelines range. The Sentencing Table calculates punishments according to a logarithmic scale. Take petitioner's original and amended Guidelines ranges, for example. The original range was 135 to 168 months, a difference of 33 months. The amended range, by comparison, is 108 to 135 months, a difference of 27 months. And viewed logarithmically, what may seem the middle of a new lower range is not necessarily proportionate to what may seem the middle of the old higher range. Nothing in the Guidelines, or elsewhere, encourages arguments about such matters among lawyers or judges who are not experts in advanced mathematics.
  More importantly, the Guidelines ranges reflect to some degree what many, perhaps most, judges believed in the pre-Guidelines era was a proper sentence based upon the criminal behavior at issue and the characteristics of the offender. Thus, a judge's choice among points on a range will often simply reflect the judge's belief that the chosen sentence is the "right" sentence (or as close as possible to the "right" sentence) based on various factors, including those found in § 3553(a). Insofar as that is so, it is unsurprising that changing the applicable range may lead a judge to choose a nonproportional point on the new range. We see nothing that favors the one or the other. So, as is true of most Guidelines sentences, the judge need not provide a lengthy explanation if the "context and the record" make clear that the judge had "a reasoned basis" for reducing the defendant's sentence. Rita, supra, at 356, 359, 127 S.Ct. 2456.
  C
  Turning to the facts of this case, we find that the District Court's explanation satisfies the standard we used in Rita and Gall, assuming it applies to sentence modifications. In Rita, as we earlier said, we upheld as lawful a sentencing judge's explanation that stated simply that the Guidelines sentence imposed was " 'appropriate.' " 551 U.S., at 358, 127 S.Ct. 2456. We noted that, in respect to the brevity or length of the reasons the judge gives for imposing a particular Guidelines sentence, the "law leaves much" to "the judge's own professional judgment." Id., at 356, 127 S.Ct. 2456. We pointed out that the sentencing judge in that case had "set forth enough to satisfy the appellate court that he ha[d] considered the parties' arguments and ha[d] a reasoned basis for exercising his own legal decisionmaking authority." Ibid. The same is true here.
  At petitioner's original sentencing, he sought a variance from the Guidelines range (135 to 168 months) on the ground that his history and family circumstances warranted a lower sentence. The judge denied his request. In doing so, the judge noted that he had "consulted the sentencing factors of 18 U.S.C. 3553(a)(1)." He explained that the "reason the guideline sentence is high in this case, even the low end of 135 months, is because of the [drug] quantity." He pointed out that petitioner had "distributed 1.7 kilograms of actual methamphetamine," a "significant quantity." And he said that "one of the other reasons that the penalty is severe in this case is because of methamphetamine." He elaborated this latter point by stating that he had "been doing this a long time, and from what [he] gather[ed] and what [he had] seen, methamphetamine, it destroys individual lives, it destroys families, it can destroy communities." App. 25.
  This record was before the judge when he considered petitioner's request for a sentence modification. He was the same judge who had sentenced petitioner originally. Petitioner asked the judge to reduce his sentence to 108 months, the bottom of the new range, stressing various educational courses he had taken in prison. The Government pointed to his having also broken a moderately serious rule while in prison. The judge certified (on a form) that he had "considered" petitioner's "motion" and had "tak[en] into account" the relevant Guidelines policy statements and the § 3553(a) factors. Id ., at 106-107 (under seal). He then reduced the sentence to 114 months. The record as a whole strongly suggests that the judge originally believed that, given petitioner's conduct, 135 months was an appropriately high sentence. So it is unsurprising that the judge considered a sentence somewhat higher than the bottom of the reduced range to be appropriate. As in Rita, there was not much else for the judge to say.
  The dissent would have us ignore the record from the initial sentencing and consider only what the judge said when modifying petitioner's sentence. See post, at 1969 - 1970 (opinion of KENNEDY, J.). But, as we have made clear before, a sentence modification is "not a plenary resentencing proceeding." Dillon, 560 U.S., at 826, 130 S.Ct. 2683. We therefore need not turn a blind eye to what the judge said at petitioner's initial sentencing. The dissent suggests the judge's failure to grant petitioner a proportional reduction "limits the relevance of the initial sentencing proceeding." Post, at 1970. To the contrary, the record of the initial sentencing sheds light on why the court picked a point slightly above the bottom of the reduced Guidelines range when it modified petitioner's sentence. Our decision is not (as the dissent claims) based on mere "speculation." Post, at 1971. Rather, we simply find the record as a whole satisfies us that the judge "considered the parties' arguments and ha[d] a reasoned basis for exercising his own legal decisionmaking authority." Rita, supra, at 356, 127 S.Ct. 2456.
  This is not to say that a disproportionate sentence reduction never may require a more detailed explanation. It could be that, under different facts and a different record, the district court's use of a barebones form order in response to a motion like petitioner's would be inadequate. As we said above, the courts of appeals are well suited to request a more detailed explanation when necessary. See supra, at 1965 - 1966. The dissent asserts that appellate courts would not need to remand for further explanation if district courts provided an additional "short statement or check[ed] additional boxes" on the form order. Post, at 1971. That may be so, and nothing in this decision prevents judges from saying more when, in their professional judgment, saying more is appropriate. Providing a more detailed statement of reasons often serves "a salutary purpose" separate and apart from facilitating appellate review. Rita, 551 U.S., at 357, 127 S.Ct. 2456. But our task here is to decide the case before us. And given the simplicity of this case, the judge's awareness of the arguments, his consideration of the relevant sentencing factors, and the intuitive reason why he picked a sentence above the very bottom of the new range, the judge's explanation (minimal as it was) fell within the scope of the lawful professional judgment that the law confers upon the sentencing judge. See Id. at 356, 127 S.Ct. 2456.
  The Court of Appeals concluded the same. Its judgment is therefore affirmed.
  It is so ordered.
  Justice GORSUCH took no part in the consideration or decision of this case.
  When the District Court reduced petitioner Adaucto Chavez-Meza's sentence, it entered its order on a terse "AO-247" form. An example of this form is attached as an Appendix, infra . On the form order, the District Court checked a box next to preprinted language stating that it had "considered" Chavez-Meza's motion for a reduced sentence and that it had "tak[en] into account the policy statement set forth at USSG § 1B1.10 and the sentencing factors set forth in 18 U.S.C. § 3553(a), to the extent that they are applicable." App. 106-107 (under seal). The District Court checked another box indicating that Chavez-Meza's motion was granted, and the court stated that it was reducing his sentence to 114 months. Ibid. But the District Court did not explain why it chose that particular sentence or why it had not sentenced Chavez-Meza to the bottom of his Guidelines range, as it had done at his original sentencing. Under these circumstances, in my view the District Court's order was insufficient to allow for meaningful appellate review, a conclusion that requires this respectful dissent.
  My disagreement with the majority is based on a serious problem-the difficulty for prisoners and appellate courts in ascertaining a district court's reasons for imposing a sentence when the court fails to state those reasons on the record; yet, in the end, my disagreement turns on a small difference, for a remedy is simple and easily attained.
  Just a slight expansion of the AO-247 form would answer the concerns expressed in this dissent in most cases, and likely in the instant one. If the form were expanded to include just a few more categories covering the factors most often bearing on a trial court's sentencing determination, the objections petitioner raises likely would be met. The statute would be satisfied; district judges would have a helpful form that might well reduce the time for consideration of cases-and even if not would help ensure the full consideration which tends to result in uniformity and fairness; the Courts of Appeals, from the outset, would have far more assistance in determining whether appeals have merit; and this in turn would yield judicial efficiencies that the sentencing system must have to be effective and that Courts of Appeals must have to ensure that the relevant statute can be administered and applied in an efficient, fair, and uniform way. The Court today, however, gives its full approval to a conclusory order. Its resulting holding is detrimental to the judicial system and to prisoners alike.
  The Sentencing Reform Act of 1984 authorizes a district court to reduce a prisoner's sentence when he "has been sentenced to a term of imprisonment based on a sentencing range that has subsequently been lowered by the Sentencing Commission." 18 U.S.C. § 3582(c)(2). Congress specified that district courts may reduce a defendant's sentence only "after considering the factors set forth in section 3553(a) to the extent that they are applicable, if such a reduction is consistent with applicable policy statements issued by the Sentencing Commission." Ibid.
  In United States v. Taylor, 487 U.S. 326, 336, 108 S.Ct. 2413, 101 L.Ed.2d 297 (1988), this Court addressed a statutory scheme that, like § 3582(c)(2), required district courts to consider specific statutory factors when they exercised their discretion. The Court held that "[w]here, as here, Congress has declared that a decision will be governed by consideration of particular factors, a district court must carefully consider those factors as applied to the particular case and, whatever its decision, clearly articulate their effect in order to permit meaningful appellate review." Id., at 336-337, 108 S.Ct. 2413.
  Here, the form order fails to provide sufficient information either to give adequate and efficient instruction to the trial court or to permit meaningful appellate review. The form order discloses no basis for determining why the District Court did not sentence Chavez-Meza to the bottom of his new Guidelines range, as it had when it imposed his original sentence.
  The Court points out that there is no presumption in favor of a proportional reduction when a judge reduces a prisoner's sentence pursuant to § 3582(c)(2). Ante, at 1965 - 1966. That is true, as far as it goes. The issue here, however, is not whether district courts must grant proportional reductions; rather, the issue is what explanation should be required to permit meaningful review of a trial court's resentencing order.
  The amount of necessary explanation might be different when a district court grants a proportional reduction-for example, when it sentences a defendant to the top or the bottom of his Guidelines range for both the initial and reduced sentence. In that circumstance, in most instances, an appellate court properly can infer that the district court's reasons were the same as those it gave when it imposed the initial sentence. See Brief for National Association of Criminal Defense Lawyers et al. as Amici Curiae 6-11 (explaining that district courts typically grant proportional reductions and that the Sentencing Commission often assumes they will do so). Less explanation is necessary, not because proportional reductions are favored as a legal matter but because the initial sentencing proceeding provides a record from which an appellate court can make prompt and reliable inferences as to the reasons that informed the trial court's decision to resentence a defendant to the same relative point on his amended Guidelines range. Contrary to the Court's suggestion, furthermore, one need not have an advanced degree in mathematics, much less a calculator, to draw this reasonable inference. District courts, as a matter of routine, regularly grant proportional reductions; and it seems unlikely that they conduct intricate logarithmic computations before doing so.
  In contrast to a proportional reduction in a prisoner's sentence, a nonproportional reduction suggests that the district court's reasons for choosing a particular sentence might be different from those it gave when it imposed the sentence in the first instance. Accordingly, a more specific explanation-but by no means an elaborate one-is necessary for an appellate court to determine why the district court chose a new point on the revised Guidelines range.
  The Court's analogy to Rita v. United States, 551 U.S. 338, 356, 127 S.Ct. 2456, 168 L.Ed.2d 203 (2007), fails as well. See ante, at 1966 - 1967. In Rita, the District Court imposed the defendant's sentence at a hearing. The record made clear that "the sentencing judge listened to each argument," "considered the supporting evidence," and then determined that a 33-month sentence was "appropriate."
  551 U.S., at 357-358, 127 S.Ct. 2456. But here there was no hearing when the District Court reduced Chavez-Meza's sentence in light of the amended Guidelines. The District Court's reasoning must be surmised from its terse, largely uninformative order. At Chavez-Meza's initial sentencing there was a hearing similar to the one in Rita . But the fact that the District Court did not grant Chavez-Meza a proportional reduction when it later reconsidered his sentence limits the relevance of the initial sentencing proceeding.
  The District Court may well have had a legitimate reason for reducing Chavez-Meza's sentence to 114 months instead of 108 months. And even a brief explanation stating that reason likely would have sufficed, for district courts need not write at length each time they rule upon a § 3582(c)(2) motion.
  The Court is quite correct to point out that a trial judge "need only 'set forth enough to satisfy the appellate court that he has considered the parties' arguments and has a reasoned basis for exercising his own legal decisionmaking authority.' " Ante, at 1970 (quoting Rita, supra, at 356, 127 S.Ct. 2456 ). It is likely that even a checkbox form would suffice in most cases, provided the form lists enough of the common reasons so that an appellate court, in most cases, can easily ascertain why the district court chose a particular sentence. Here, for example, the District Court simply could have added a sentence or two to the AO-247 form's "Additional Comments" box. Or, perhaps preferably, trial courts could use an expanded version of the AO-247 form that allows judges to indicate, even by checking a box, the reason or reasons for choosing a particular sentence.
  In this case, however, the District Court's reasons remain a mystery. The Court today speculates that the District Court sentenced Chavez-Meza to 114 months because he distributed a large quantity of methamphetamine. Ante, at 1966 - 1967. For its part, the Court of Appeals speculated that the reason might have been "an incident of misconduct while in prison." See 854 F.3d 655, 660 (C.A.10 2017). But there is no basis for these assumptions in the District Court's order. The sort of guesswork the Court relies upon in today's decision is insufficient to provide meaningful appellate review of a district court's exercise of its discretion under § 3582(c)(2). See Taylor, 487 U.S., at 342-343, 108 S.Ct. 2413.
  According to the Court of Appeals, the relevant provisions of the Sentencing Reform Act must be read to allow a trial court not to give or state any reasons at all for a resentencing order. 854 F.3d, at 658. This was error. The Court of Appeals reached its conclusion by comparing the provisions that relate to original sentencing- § 3553(c) -with the provisions that pertain to the resentencing process- § 3582(c)(2). It reasoned that, because the former has an express requirement to state reasons while the latter does not, the statutory structure eliminates any requirement for reasons upon resentencing. The Court of Appeals' analysis, however, ignores the scope of the statutory text in § 3553(c). That section pertains to a procedure that is a full-scale adversary proceeding, where the defendant and counsel are present. As part of that procedure, the statute states: "The court, at the time of sentencing, shall state in open court the reasons for its imposition of the particular sentence." § 3553(c).
  The statute does not require a full-scale adversary proceeding when resentencing is being considered after a Guidelines reduction. But it is incorrect to conclude that the absence of all those requirements forecloses the necessity to make a record that allows an appellate court to exercise meaningful review of the reasons for the resentencing order. This conclusion follows from this Court's decision in Taylor, holding that courts must "clearly articulate" their reasoning "in order to permit meaningful appellate review," even without any specific statutory command. 487 U.S., at 336-337, 108 S.Ct. 2413. So the fact that Congress adopted a detailed explanatory requirement in another part of the statute does not displace Taylor 's background rule that district courts must provide enough reasoning for appellate courts to review their decisions when they exercise discretion under a statute like § 3582(c)(2).
  The Court quite correctly rejects the Government's invitation to adopt the Court of Appeals' interpretation. See ante, at 1965 - 1966. The Court's ensuing analysis, however, is, in my respectful view, still incorrect. On the one hand, the Court holds that appellate courts may determine on a case-by-case basis whether a form order like the one here provides enough explanation. See ante, at 1965 - 1966, 1967 - 1968. Thus, any prisoner can appeal and argue that the order was insufficient in his case. On the other hand, the Court does not impose any serious requirement that a district court state its reasons on the front end-that is, before the appeal, when the district court rules on the § 3582(c)(2) motion. Thus, in cases like this one, appeals will often be based on speculation that requires the prisoner, the Government, and the Court of Appeals to hypothesize the potential reasons for the prisoner's sentence when a reduction is weighed and considered.
  This is an unwise allocation of judicial resources. District courts, to state the obvious, are best positioned to explain their reasons for imposing a particular sentence. Under the majority's opinion, however, appellate courts will often lack clarity as to a district court's reasoning and will be forced to either speculate (as the Court does today) based on their own view of the record, or remand the case for further explanation, likely followed by another appeal. What could have taken a sentence or two at the front end now can, and likely will, produce dozens of pages of briefs, bench memoranda, orders, and judicial opinions as the case makes its way first to the appellate court, then back down to the trial court and perhaps back to the appellate court again.
  A better, more efficient rule would require trial courts in cases like this one to provide their reasons in their initial decisions either by giving a short statement or checking additional boxes. We must be conscious of the fact that retroactive amendments to the Guidelines can result in thousands of resentencings. That is all the more reason the inefficiencies resulting from today's decision ought to be avoided. And given the uncertainty that will ensue from today's decision, district courts would be wise to say more than the court said in this case, even in the absence of a holding requiring it to do so on the specific facts at issue here.
  For these reasons, I respectfully dissent.
  APPENDIX