Health Calculators — BMI, Calories, TDEE, Body Fat &amp; More

BMI Calculator

Calculate your Body Mass Index (BMI) from height and weight. See your BMI category and healthy weight range instantly.

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Calorie Calculator

Find how many calories you need a day to maintain, lose or gain weight. Based on the Mifflin-St Jeor equation, your activity level and safe intake limits.

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TDEE Calculator

Calculate your TDEE (Total Daily Energy Expenditure): the calories you burn per day. Uses the Mifflin-St Jeor equation and shows all five activity levels.

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BMR Calculator

Calculate your BMR (basal metabolic rate): the calories your body burns at complete rest. Compares the Mifflin-St Jeor and revised Harris-Benedict equations.

Body Fat Calculator

Estimate your body fat percentage with the U.S. Navy tape-measure method. Enter height, neck and waist (plus hips for women) to see your result and category.

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Ideal Weight Calculator

Find your ideal body weight for your height with the Devine, Robinson and Miller formulas, plus your healthy weight range based on BMI.

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Macro Calculator

Calculate daily protein, carbs and fat in grams for your goal: lose weight, maintain or build muscle. Based on your calorie needs and expert protein targets.

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Water Intake Calculator

Calculate how much water to drink a day from your weight, activity and climate, in litres and glasses, compared with official intake guidelines.

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Pregnancy Due Date Calculator

Calculate your estimated due date based on the first day of your last period. See trimester milestones and weeks pregnant.

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Ovulation Calculator

Estimate your ovulation date and fertile window based on your menstrual cycle. Plan for conception or track your fertility.

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Heart Rate Zone Calculator

Calculate your heart rate training zones based on age and resting heart rate. See fat burn, cardio, and peak zones.

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Body Surface Area Calculator

Calculate your Body Surface Area (BSA) using DuBois, Mosteller, and Haycock formulas. Used in medical dosing and clinical settings.

Lean Body Mass Calculator

Calculate your lean body mass — the weight of everything in your body except fat. Uses Boer, James, and Hume formulas.

Waist-to-Hip Ratio Calculator

Calculate your waist-to-hip ratio (WHR) and check it against the WHO cut-offs for increased health risk: 0.90 for men and 0.85 for women.

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Protein Intake Calculator

Find how much protein you need a day in grams for your weight, activity and goal, using research-based g/kg targets for fat loss and muscle gain.

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Calories Burned Calculator

Calculate calories burned during any physical activity. Enter your weight, activity type, and duration for accurate results.

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Sleep Calculator

Calculate the best times to wake up or go to sleep based on 90-minute sleep cycles. Wake up feeling refreshed instead of groggy.

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Blood Alcohol Calculator

Estimate your blood alcohol concentration (BAC) based on drinks consumed, body weight, gender, and time. Know when you may be sober.

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Pace Calculator

Calculate your running or walking pace, speed, and finish time. Enter any two values to get the third. Great for race planning.

One Rep Max Calculator

Estimate your one rep max (1RM) from the weight and reps you lifted with the Epley, Brzycki and Lombardi formulas, plus training loads by % of 1RM.

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Body Recomposition Calculator

Calculate calories and macros for body recomposition — building muscle while losing fat. Get training day and rest day targets.

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Glycemic Load Calculator

Calculate the glycemic load (GL) of a food from its glycemic index (GI) and serving size. Understand blood sugar impact.

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Blood Pressure Calculator

Check your blood pressure category from systolic and diastolic readings using the 2025 AHA guideline: normal, elevated, stage 1, stage 2 or severe.

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VO2 Max Calculator

Estimate your VO2 max from running performance or the Cooper test. See your cardiovascular fitness level and age-based percentile.

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Army Body Fat Calculator

Calculate body fat percentage using the U.S. Army (DoD) tape test method. Enter neck, waist, and height measurements.

Adjusted Body Weight Calculator

Calculate adjusted body weight for obese patients using the Devine ideal body weight formula. Used in clinical nutrition and drug dosing.

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Baby Growth Percentile Calculator

Track your baby's growth percentile for weight and length from birth to 24 months using WHO growth standards.

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Body Shape Calculator

Determine your body shape — apple, pear, hourglass, or rectangle — based on bust, waist, and hip measurements.

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Child & Teen BMI Calculator

Calculate BMI for children and teens aged 2-20 with age- and sex-specific CDC percentile categories.

Child Height Percentile Calculator

Find your child's height-for-age percentile using CDC growth charts for children aged 2-18 years.

Child Weight Percentile Calculator

Find your child's weight-for-age percentile using CDC growth charts for children aged 2-18 years.

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Desk Height Calculator

Find the ergonomically ideal desk, chair, and monitor height based on your standing height. Prevent back pain and improve posture.

FFMI Calculator (Fat-Free Mass Index)

Calculate your Fat-Free Mass Index to assess your muscularity relative to your height. See if your physique is achievable naturally.

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Height Calculator

Predict a child's adult height using the mid-parental height method based on mother and father's heights.

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Height Converter

Convert height between centimetres, feet & inches, and metres. Quick, accurate bidirectional height conversion.

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IQ Percentile Calculator

Convert any IQ score to a percentile rank and classification. See what percentage of the population scores below your IQ.

Waist-to-Height Ratio Calculator

Calculate your waist-to-height ratio (WHtR) and your central fat category from NICE guidance. Keep your waist to less than half your height.

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Weight Loss Percentage Calculator

Calculate what percentage of your body weight you've lost. Track progress and set realistic weight loss goals.

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Calorie Density Calculator

Calculate the calorie density (calories per gram) of any food. Compare foods to make smarter eating choices for weight management.

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Carb Calculator

Calculate your recommended daily carbohydrate intake in grams based on your TDEE, activity level, and fitness goal.

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Fat Intake Calculator

Calculate your recommended daily fat intake in grams based on calorie needs and dietary guidelines.

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Harris-Benedict Calculator

Calculate your BMR and daily calorie needs using the original and revised Harris-Benedict equation. Compare with Mifflin-St Jeor.

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Keto Calculator

Calculate your ideal macros for the ketogenic diet — high fat, moderate protein, very low carb. Get personalized keto targets.

Maintenance Calorie Calculator

Calculate your exact maintenance calories — the number of calories needed to maintain your current weight with no change.

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Mifflin St. Jeor Calculator

Calculate your BMR using the Mifflin-St Jeor equation — the most accurate BMR formula for most adults. See daily calorie needs at all activity levels.

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Net Carb Calculator

Calculate net carbs by subtracting fiber and sugar alcohols from total carbs. Essential for keto and low-carb diets.

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RMR Calculator

Calculate your Resting Metabolic Rate — the calories you burn at rest including minimal daily movement. Slightly higher than BMR.

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Weight Gain Calculator

Calculate how many calories you need to eat to gain weight. See daily surplus needed and estimated timeline to reach your goal weight.

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Weight Loss Calculator

Calculate how many calories you need to eat to lose weight. See your daily deficit and estimated timeline to reach your goal weight.

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Air Force PT Test Calculator

Score your Air Force Physical Fitness Test — push-ups, sit-ups, and 1.5-mile run. See composite score and pass/fail status.

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Army Fitness Test Calculator

Score your Army Combat Fitness Test (ACFT) — deadlift, power throw, push-ups, sprint-drag-carry, plank, and 2-mile run.

Bench Press Calculator

Estimate your bench press one-rep max from any rep count. See strength standards and programme training loads.

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Calories Burned Biking Calculator

Calculate calories burned cycling at any speed — leisure, commuting, or racing. Based on MET values and body weight.

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Calories Burned Hiking Calculator

Calculate calories burned hiking with adjustments for terrain, grade, pack weight, and elevation gain.

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Calories Burned Jumping Rope Calculator

Calculate calories burned jumping rope at different speeds. One of the most efficient cardio exercises.

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Calories Burned Running Calculator

Calculate calories burned running at any pace and distance. Accounts for body weight and running speed.

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Calories Burned Swimming Calculator

Calculate calories burned swimming — freestyle, backstroke, breaststroke, and butterfly at various intensities.

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Calories Burned Walking Calculator

Calculate calories burned walking at different speeds and durations. The most accessible form of exercise.

Calories Burned Weight Lifting Calculator

Calculate calories burned during weight training sessions at different intensities — light, moderate, and vigorous.

Deadlift Max Calculator

Estimate your deadlift one-rep max from any rep count. See strength standards and percentage-based training loads.

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Golf Altitude Adjustment Calculator

Adjust your golf shot distances for altitude. Higher elevation means thinner air and longer carries.

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Ice Rink Volume and Fill Time Calculator

Calculate the water volume and fill time needed for an ice skating rink of any size. Plan your backyard rink build.

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Lifting Strength Calculator

Assess your overall lifting strength level across major lifts. See where you stand from beginner to elite.

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Miles to Steps Calculator

Convert miles to steps based on your stride length and height. See how many steps are in a mile for your body.

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Navy PRT Calculator

Score your Navy Physical Readiness Test — push-ups, planks, and 1.5-mile run or cardio alternative.

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Push-Ups Calorie Calculator

Calculate calories burned doing push-ups based on your body weight and the number of reps performed.

Squat Max Calculator

Estimate your squat one-rep max from any rep count. See strength standards and percentage-based training loads.

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Steps to Calories Calculator

Convert your daily step count into calories burned. Based on body weight and walking intensity.

Steps to Kilometers Calculator

Convert your step count to kilometers based on your stride length. See how far you've walked.

Steps to Miles Calculator

Convert your step count to miles based on your stride length. Track walking and running distances.

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USMC PFT/CFT Calculator

Score your Marine Corps Physical Fitness Test — pull-ups/push-ups, crunches/planks, and 3-mile run.

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Zone 2 Heart Rate Calculator

Calculate your Zone 2 heart rate range for optimal fat-burning and aerobic base building using age-based methods.