Free Health & Fitness Calculators
Fast, accurate calculators for BMI, daily calories, macros, body fat, ideal weight, hydration, one-rep max, and running pace. Every tool works in both metric and imperial units — no sign-up, no cost.
Health calculators you can actually trust
Healthy Calculator Hub brings the most-used health and fitness calculators together in one fast, clean place. Each tool uses a recognised formula — Mifflin-St Jeor for calories, the U.S. Navy method for body fat, Epley and Brzycki for one-rep max — and shows both a clear number and a plain-language interpretation so you know what the result actually means.
Whether you're setting a calorie target, checking whether your weight sits in a healthy range, dialling in your macros, or planning a race pace, you'll get an instant answer without adverts burying the tool or a sign-up wall in the way. Start with a BMI check, estimate your daily calories, then split them with the macro calculator.
Estimates for education, not medical advice
Every calculator here provides general estimates for educational purposes only. Formulas are built for populations, so individual results vary with age, genetics, health conditions, and measurement accuracy. Nothing on this site is a substitute for professional care — please consult a qualified healthcare provider before making decisions about your health, diet, or exercise. You can read more on our about page.