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Fitness Calculators

Browse 13 tools, including Calorie Calculator, Body Fat Calculator, BMR Calculator.

Calorie Calculator

Estimate adult resting energy using Mifflin–St Jeor and maintenance energy using an explicit activity multiplier.

Estimate adult body-fat percentage from the published circumference equations, with explicit measurement units.

Estimate adult resting energy using Mifflin–St Jeor and maintenance energy using an explicit activity multiplier.

Allocate an entered calorie target between protein, fat and carbohydrate.

Calculate running/walking pace per kilometer or mile and average speed.

Calculate the waist-to-height ratio used by the Army’s July 2026 body-composition standard.

Calculate fat mass and lean mass from body weight and an entered body-fat estimate.

Estimate activity energy expenditure from an entered MET value, body weight and duration.

Estimate a one-repetition maximum with the Epley equation from a short set.

Estimate age-predicted maximum heart rate and general moderate/vigorous activity zones.

Convert a chosen grams-per-kilogram protein factor into a daily protein quantity.

Estimate adult resting energy using Mifflin–St Jeor and maintenance energy using an explicit activity multiplier.

Calculate the best-eight average from exactly 20 official Score Differentials.

13 working tools. Each page explains its inputs, formula and assumptions.