Tools

Every calculator here shows the arithmetic, the sources underneath, and the date we last redid it by hand. Typing a number is the easy part.

What you can check here

4 calculators27 sources

Body fat calculatorFour published formulas estimate your body fat from circumferences, from skinfolds, or from nothing but your height and weight. On the same man they return 12 to 20 per cent. Every one of them states its own standard error, and those run from 3.3 to 4.8 percentage points. This calculator sets them side by side and rounds to whole per cent.
TDEE calculatorEvery TDEE calculator hands you one confident number, and for one person in four that number is wrong by tens of per cent. So we give a band.
1RM calculatorEvery 1RM calculator picks one formula and hands you a number. We fill in ten, show you they land 9 per cent apart, and are the only one that asks which lift you did.
Protein intake calculatorTen published figures address how much protein you need in a day. Five come from a European authority and five from the sports literature. No authority has set a figure for athletes at all. This calculator asks for your weight, your training and your goal, lines all ten up and picks no number out of them.