Body Formula: Calculators That Show Their Working

Why it surfaced

Its one-rep-max calculator runs seven published formulas side by side, showing a 253–268 lb range for the sample set rather than pretending there is one exact answer. The site also prints method limits and error bars, including the warning that one-rep-max estimates become unreliable above ten repetitions.

A fitness calculator suite for strength, running, sleep, body composition, calories, and protein that compares formulas instead of hiding them.