Free Tools

Wellbeing Calculators

52 free, evidence-based calculators across wellbeing, sleep, fitness, nutrition, and workplace health. All calculations run in your browser — no account required.

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A. Wellbeing & Mental Health

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B. Sleep & Recovery

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C. Body & Fitness

BMI Calculator

Body Mass Index with context on its limitations and use.

BMR Calculator

Basal Metabolic Rate using the Mifflin-St Jeor equation.

TDEE Calculator

Total Daily Energy Expenditure based on activity level.

Body Fat Calculator

Body fat percentage using the validated US Navy method.

Waist-to-Hip Ratio Calculator

WHO-standard cardiovascular risk assessment.

Waist-to-Height Ratio Calculator

A simple risk marker that works across ethnicities.

Ideal Weight Calculator

A healthy weight range based on the Devine formula.

Lean Body Mass Calculator

Estimate fat-free mass using the Boer formula.

One-Rep Max Calculator

Epley and Brzycki 1RM estimates from submaximal lifts.

Max Heart Rate Calculator

Age-based MHR using the validated Tanaka formula.

Heart Rate Zone Calculator

Five training zones via the Karvonen method.

Resting Heart Rate Calculator

Measure and interpret your resting heart rate.

Calories Burned Calculator

MET-based calorie burn for hundreds of activities.

Steps to Calories Calculator

Convert daily step count to distance and calories.

Daily Step Goal Calculator

Find your optimal daily step target based on your goals.

Running Pace Calculator

Calculate pace, speed, and finish time for any distance.

Race Time Predictor

Predict finish time at a new distance using the Riegel formula.

Cycling Speed & Power Calculator

Estimate average speed and power output for cycling.

VO2 Max Estimator

Estimate aerobic fitness from a 12-minute run test.

Swimming Pace Calculator

Calculate swim pace per 100m or 100 yards.

Weight Loss Timeline Calculator

Safe weight loss rate with evidence-based calorie targets.

Muscle Gain Calculator

Realistic muscle gain timeline and calorie surplus guidance.

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D. Nutrition & Hydration

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E. Workplace & Organisation

Evidence-Based, Not Guesswork

Every formula is sourced from peer-reviewed research or established clinical guidelines. Sources are cited on each calculator page.

Read our wellbeing guides