🩺 Health Calculators

Know your numbers.
Know what to do next.

Free health calculators across four categories — body composition, calorie & fitness, wellness & lifestyle, and clinical reference. Every result comes with a plain-English explanation so you know what to do with it.

25+health tools
4categories
100%free, no signup
🔍
Browse by category
⚖️
Body Composition
BMI, body fat %, ideal weight, lean mass
7 tools→
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Calorie & Fitness
BMR, TDEE, macros, heart rate, strength
11 tools→
🌸
Wellness & Lifestyle
Hydration, caffeine, women's health, dental
5 tools→
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Clinical Reference
Cardiac, fall risk, blood pressure staging
3 tools→
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Body Composition

BMI, body fat, ideal weight, and lean mass tools

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📊Popular
BMI CalculatorCalculate your Body Mass Index with category classification and healthy weight range for your height.→
🎯New
Reverse BMI CalculatorFind the weight needed to reach a target BMI — for weight loss or gain goal-setting.→
🔬Popular
Body Fat Percentage CalculatorEstimate body fat percentage from measurements — with category classification and fitness benchmarks.→
⚖️Popular
Ideal Weight CalculatorCalculate your healthy weight range using 4 clinical formulas — Hamwi, Devine, Robinson, and Miller.→
💪Fitness
Lean Body Mass CalculatorCalculate your fat-free body mass — the foundation for accurate macro and protein targets.→
👶Paediatric
BMI for Age CalculatorCalculate BMI percentile for children and teens using CDC growth charts — ages 2–19.→
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Calorie & Fitness

BMR, TDEE, macros, activity, and performance tools

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🔥New
Resting Calorie Burn CalculatorCalculate BMR with 3 formulas (Mifflin, Harris-Benedict, Katch-McArdle) + TDEE by activity level.→
⚡Popular
BMR CalculatorCalculate your Basal Metabolic Rate — the calories burned at complete rest every day.→
🍽️Popular
Calorie CalculatorCalculate total daily energy expenditure (TDEE) by age, weight, height, sex, and activity level.→
📉Popular
Calorie Deficit CalculatorPlan your daily deficit — with weekly loss rate, timeline, and macro targets.→
🥗Popular
Macro CalculatorCalculate optimal protein, carb, and fat targets for your calorie goal and body composition objective.→
🎒New
Rucking Calorie CalculatorCalculate calories burned rucking by body weight, pack weight, distance, and pace.→
❤️Popular
Target Heart Rate CalculatorCalculate heart rate zones for fat burn, cardio, and peak training intensity by age.→
🏋️Strength
One-Rep Max CalculatorEstimate your 1RM from any weight and reps — using Epley, Brzycki, and other validated formulas.→
🏃Running
Pace CalculatorCalculate running pace, finish time, or distance for any race from 5K to marathon.→
🫁Aerobic
VO2 Max CalculatorEstimate aerobic capacity from fitness tests — with age and fitness level benchmarks.→
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Wellness & Lifestyle

Daily habits, women's health, and medical cost planning

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💧Popular
Water Intake CalculatorCalculate daily hydration needs by weight, activity, and climate — with hourly intake targets.→
☕Popular
Caffeine Half-Life CalculatorCalculate how long caffeine stays in your system and when it drops below sleep-disrupting levels.→
🌸New
Menopause Age CalculatorEstimate perimenopause start and menopause age using family history, lifestyle, and reproductive factors.→
🦷New
Dental Implant Cost CalculatorEstimate full treatment cost — surgery, crown, bone graft, insurance reduction, and monthly financing.→
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Clinical Reference

Reference tools for clinical metrics — always consult a professional for medical decisions

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🫀Clinical
Cardiac Output CalculatorCalculate cardiac output from stroke volume and heart rate — a core haemodynamic monitoring metric.→
🏥Clinical
Berg Balance Scale CalculatorScore fall risk in elderly or post-stroke patients using the validated 14-item Berg Balance Scale.→
💓Screening
Blood Pressure Stage CalculatorIdentify blood pressure stage per AHA guidelines — from normal to hypertensive crisis.→

More health calculators coming soon

Sleep debt, fertility window, stress load, posture, and more — growing regularly.

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About these health calculators

These tools are built for people making real-life health decisions. Each calculator gives you an accurate result and explains what it means in plain English, so you can act on the number — not just stare at it.

The four categories cover the most common needs: understanding your body composition, planning calories and training, building daily wellness habits, and referencing clinical metrics. All tools are free — no account required.