Title: How Many Calories in Bacon? | Common Science Space
Headings: 
How Many Calories in Bacon?
What does the internet say about the calories in bacon?
The experiment
Figure 1. Two slices each of two different sources of bacon.
The same slices, fried.
The results
Grams per 100 grams of raw starting bacon
Average: 4.0 9.4 12.9
Calories: 36 56.4 51.6
Total Calories: 144
Fat Calories: 41%
The average calorie content for these samples of cooked bacon, representing three different brands and not differing much from each other, was 144 Calories per 100 grams of raw bacon.
The average slice weighed 49 grams before cooking, and yielded cooked bacon with 71 Calories per slice.
The average slice weighed just 16 grams after cooking, for an average energy content of the bacon as eaten of 4.4 Calories per gram, if you want to do the calculation that way.
The cooked bacon contained about 41% of its calories in fat (present in the fat itself, and as part of the cracklings). The streaks of meat, and the meat present in the cracklings, contained the rest.
Caveats about eating a lot of bacon
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Content: That doesn’t help much, because it doesn’t tell us how big the slice was to begin with — was it thin cut or thick? — The “Fitbit” site gives very confusing information. One page you get if you Google “Fitbit bacon calories” claims that 1 slice of thick bacon, fried, provides 42 Calories, none of these from fat! But it then gives a value of 29 grams of fat, which would contain about 260 Calories. On another Fitbit page, you learn that a serving of 2 slices of cooked bacon contains 70 Calories, with 50 of these coming from fat. That’s not unreasonable for very thin, short slices. But then, on the same page, a serving of 13 grams of cooked bacon provides those same values — 70 Calories total, 50 from fat. That’s 71% from fat. Wiki gives a value of 66 Calories per slice, Fitbit only 35. — The “Myfitnesspal” site provides two values for the Calories in a slice of bacon, 37 and 45, with fat accounting for 68% of the total.