In England, the length and width of the common brick has remained fairly constant over the centuries (but see brick tax), but the depth has varied from about two inches (about 51 mm) or smaller in earlier times to about two and a half inches (about 64 mm) more recently.
In the United States, modern standard bricks are specified for various uses;[REF] most are sized at about 8 × × inches (203 × 92 × 57 mm).