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Fitness Calculators

14 tools

All 14 calculators

One Rep Max Calculator

Calculate your one-rep max (1RM) from any weight and rep set with Epley, Brzycki and Lombardi formulas, plus a full training percentage table.

Calculate →BENCH

Bench Press Max Calculator

Estimate your bench press max from any rep set. Epley, Brzycki and Lombardi formulas with a percentage training table for pressing days.

Calculate →SQUAT

Squat Max Calculator

Estimate your squat max from any rep set with three validated formulas plus a full percentage training table.

Calculate →DEADLIFT

Deadlift Max Calculator

Estimate your deadlift max from any rep set. Three validated formulas plus a percentage table for pulling days.

Calculate →BMI

BMI Calculator

Check your body mass index in imperial or metric units, with category and healthy-weight range.

Calculate →BODY FAT

Body Fat Calculator

Estimate body fat percentage with the U.S. Navy circumference method or the BMI-based Deurenberg formula.

Calculate →BMR

BMR Calculator

Your basal metabolic rate with Mifflin-St Jeor and Harris-Benedict formulas — the calories you burn at complete rest.

Calculate →TDEE

TDEE Calculator

Total daily energy expenditure at every activity level, with cutting and bulking calorie targets.

Calculate →CALORIES

Calories Burned Calculator

Calories burned for any activity and duration using MET values, from walking to sprinting.

Calculate →PACE

Running Pace Calculator

Pace per mile or kilometre from any race or training time, with even splits and a Riegel marathon projection.

Calculate →HEART RATE

Target Heart Rate Calculator

Training heart-rate zones from age, with the Tanaka and classic formulas and Karvonen resting-HR precision.

Calculate →VO2 MAX

VO2 Max Calculator

Estimate VO2 max from a 12-minute Cooper run or a one-mile Rockport walk, with fitness categories.

Calculate →STEPS

Steps to Miles Calculator

Convert step counts to miles and back using your stride length, with automatic stride from height.

Calculate →FFMI

FFMI Calculator

Fat-Free Mass Index from weight, height and body fat — the muscle-mass scale that fixes BMI's athlete problem.

Calculate →

About these calculators

Fourteen evidence-based calculators covering strength, body composition and endurance training. Each tool shows the formula it uses, validates your input and puts the result in context — whether that is a 1RM training table or your TDEE at every activity level.

How to choose

Pick a tool matching the stat you want to check. Every calculator validates your input, shows the exact formula it uses, and explains how to read the result — no signup, nothing to install.

Frequently Asked Questions

Which fitness calculator should I start with?

If you lift weights, start with the one-rep max calculator; if you focus on weight management, start with TDEE — it combines your BMR with daily activity.

Are these calculators suitable for beginners?

Yes. Every tool explains its inputs in plain language and shows context for the result, so you know whether a number is good, average or a warning sign.

Do I need to create an account?

No. Every calculator is free and runs entirely in your browser.