Health Calculator: BMI & TDEE

This app is not a medical device and does not diagnose, treat, cure, or prevent any medical condition. All results are estimates based on published scientific formulas and are provided for general information only. Always consult a doctor or another qualified healthcare professional before making decisions about your health, diet, or exercise.

Health Calculator is a reference tool, not a tracker. It gives you 50+ health and fitness calculators in one place, and for every single result it shows you the formula it used, the numbers it put into that formula, and who published it.

WHY THE FORMULA IS ON SCREEN

Most calculator apps hand you a number and expect you to trust it. This one does not. Open "How this is calculated" under any result and you get the equation in symbols, the same equation with your own values substituted in, the name of the researcher or organisation that published it, and a link to the source. If you want to check the arithmetic yourself, everything you need is there.

WHAT IS INSIDE

Body composition: BMI with the WHO classification, body fat by several methods, ideal and adjusted body weight, lean body mass, fat-free mass index, body surface area, waist-to-height and waist-to-hip ratios.

Energy and metabolism: BMR and RMR by Mifflin-St Jeor, Harris-Benedict, Katch-McArdle and others, TDEE, maintenance calories, target calories, calorie density.

Nutrition: macro splits, protein, carbohydrates, net carbs, fat intake, keto macros, daily water, weight planning.

Strength: one-rep max by Brzycki, Epley, Lombardi and more, bench, squat and deadlift estimates, and a percentage-of-1RM table generated from the formula you pick.

Cardio and running: maximum heart rate, target heart rate, zone 2, full heart rate zones, pace, race time prediction, VO2 max from the Cooper test, pace conversion, split times.

Steps and activity: steps to distance in kilometres or miles, distance to steps, steps to calories, walking distance and time.

Calories burned: walking, running and cycling from the ACSM metabolic equations, which take your speed, the gradient or the power output into account, plus a general activity calculator using metabolic equivalents published by the CDC.

Lifestyle: sleep and wake times by sleep cycle, caffeine content using USDA data.

HOW IT TREATS YOU

Results are stated neutrally. A classification is quoted as what it is, a published standard, not as a verdict on you. There are no streaks, no progress graphs, no comparisons, no colour-coded judgements of your body. Calorie targets are limited to safe minimums in the calculation itself rather than shown and then warned about.

Metric and imperial throughout, including stones. Switching units converts what you have already typed instead of clearing it. Available in 85+ languages.

PRIVACY

No account. No sign-in. No subscription. The measurements you type are used to produce the result on screen and are not stored, not uploaded, and not shared. There is no fitness tracker integration and the app requests no health permissions.