Calculators
Ten tools that show their working. Each one names the equation it uses and says where that equation stops being reliable, because a number without its error bars is worse than no number.
-
BMI calculator
Work out your body mass index, see the healthy weight range for your height, and read what BMI cannot tell you.
-
Calorie calculator
Maintenance calories, the deficit for weight loss and a macro split — every step of the calculation, not just the final number.
-
TDEE calculator
What you burn in a day at every activity level, side by side, and how to check the estimate against your own scale.
-
Calorie deficit calculator
Daily calories for the rate you choose, and two goal dates: one if you adjust as you go, one if weight loss slows because you don't.
-
BMR calculator
Your basal metabolic rate from Mifflin-St Jeor, Harris-Benedict and Katch-McArdle, compared, so you can see how much they disagree.
-
Protein calculator
Your daily protein intake in grams, set by what you are actually asking your body to do.
-
Macro calculator
Your daily macros in grams for weight loss, maintenance or gain, in four diet styles, split across your meals.
-
Ideal weight calculator
Four ideal body weight formulas side by side, plus the healthy weight range that is the more defensible target.
-
Body fat calculator
Estimate your body fat percentage with the US Navy tape method — three measurements, and an honest account of the error bars.
-
Water intake calculator
Your daily water intake from body weight, exercise and climate — and why thirst tracks the requirement better than this number does.