Fitness

18 calculators

Fitness

Calorie, BMI, macros, and workout calculators

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18 available

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BMI Calculator

Calculate Body Mass Index and health status

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Calorie Calculator

Calculate daily calorie needs for weight goals

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Macro Calculator

Calculate macronutrient ratios for your goals

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Pace Calculator

Calculate running and walking pace, time, or distance

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BMR Calculator

Calculate your Basal Metabolic Rate (BMR) using Mifflin-St Jeor, Revised Harris-Benedict, and Katch-McArdle formulas.

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Calories Burned Calculator

Estimate calories burned for any activity using MET values and your body weight.

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All Fitness calculators

Ideal Weight Calculator

Find your ideal weight based on multiple formulas

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Protein Calculator

Calculate daily protein intake requirements

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Body Fat Calculator

Estimate body fat percentage using measurements

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One Rep Max Calculator

Calculate your one rep max and training percentages

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Water Intake Calculator

Calculate daily water intake requirements

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Heart Rate Zones

Calculate target heart rate zones for training

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Steps to Distance Calculator

Convert steps to kilometres or miles (and back) using your own stride length instead of a one-size-fits-all guess.

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Steps to Calories Calculator

Estimate the calories burned walking a given number of steps, using your body weight, stride and walking pace.

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Walking Time Calculator

Work out how long a walk takes from a distance in kilometres, miles or steps — with an editable walking speed.

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MET-Minutes per Week Calculator

Calculate weekly exercise volume as MET-minutes per week.

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APE Index Calculator

Compare arm span with height using the transparent APE index formula.

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Protein Intake Calculator

Estimate a daily protein target from body weight, activity level, and goal.

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Fitness calculators — Frequently asked questions

Quick answers about the fitness tools on Mathify.

What fitness calculators are offered?

BMI, calorie, macro, TDEE, BMR, pace, and step converters.

Are calorie estimates personalized?

Yes. They use your age, weight, height, and activity level.

Is fitness data private?

Yes. Everything is computed locally in your browser.