Fit Nutrition library
Calculators
Free nutrition and fitness calculators for the numbers that guide real decisions — daily calories and TDEE, protein and macro targets, BMI, body fat, and water intake. Pick a category, open the tool that fits your goal, and get a clear starting estimate you can actually use.
27 calculators
All calculators
01
TDEE Calculator: Total Daily Energy Expenditure
Your TDEE is the number of calories you burn in a day. Enter your details and activity level to estimate it and see what to eat to maintain, lose or gain.
02Waist-to-Hip Ratio (WHR) Calculator
Two tape measurements tell you where your body stores fat — and the WHO risk band that goes with it.
03Water Intake & Hydration Calculator (By Weight & Activity)
A practical daily fluid target from your weight, activity and climate — in liters, ounces and cups.