Free Health Calculators

Instant answers, right on this page. No signup, no email, no gimmicks β€” just the numbers, computed with published formulas.

Daily Calorie Needs (TDEE)

Mifflin-St Jeor equation β€” the formula clinical dietitians actually use. Your maintenance calories, plus a sensible range for losing weight without crashing.

Next: eat more while staying under your number Β· what to do when the scale stalls

Daily Protein Target

Grams per day based on your weight and goal β€” the ranges used in sports-nutrition guidance, split into per-meal portions so it's actually usable.

Next: how much protein you really need Β· does timing matter?

Daily Water Baseline

A weight-based starting point (30-35 ml per kg), adjusted for exercise and hot weather. Thirst still outranks any formula β€” this is a baseline, not a rule.

Next: how much water supports weight loss Β· water and appetite

These calculators give general educational estimates, not medical advice β€” individual needs vary with health conditions, medications and more. See how this site works, and talk to a clinician before big changes.