Health Calculators
Last updated: October 2026
BMR / TDEE Calculator
Estimate your daily calorie needs using the revised Harris-Benedict equation, then adjust for activity to get your Total Daily Energy Expenditure (TDEE) — the rough number of calories you burn in 24 hours when you eat a maintenance diet.
BMI Calculator
Calculate Body Mass Index (BMI) — body weight in kg divided by height in metres squared — to screen for under/overweight categories.
Calories Burned Calculator
Estimate the calories you burn walking, running, cycling, swimming and other activities from your weight, the activity and how long you do it, using MET values.
Heart Rate Training Zones Calculator
Calculate your personalised heart rate training zones using the Karvonen heart rate reserve method, which factors in resting heart rate to give zones that actually reflect your cardiovascular fitness.
Sleep Schedule Calculator
Work out what time to go to bed so you get the sleep you need before your alarm, based on age-group recommendations and how much of your time in bed you actually sleep.
Macro Calculator
Split your daily calorie target into grams of protein, carbohydrates, and fat tuned to your goal — fat loss, muscle gain, or maintenance.
Calorie Deficit & Weight Loss Calculator
Estimate how much weight you'll lose over a set number of weeks from your daily calorie deficit and exercise.
Blood Pressure Risk Assessment Calculator
Assess your cardiovascular risk score based on blood pressure readings, age, smoking status, and family history of heart disease.
Blood Alcohol Content (BAC) Calculator
Estimate blood alcohol content (BAC) from standard drinks, body weight, sex and time since your first drink, using the Widmark formula.
BMI & Body Fat Percentage Calculator
Calculate your BMI and estimate body fat percentage from body measurements using the U.S.
Body Fat Calculator (Navy Method)
Estimates body fat percentage using the U.S.
Daily Water Intake Calculator
Estimate your daily water needs from body weight, activity level, climate, and health factors.
Bra Size Calculator
Estimate a US bra size from underbust and bust measurements.
Body Type Calculator
Classify the female body shape (hourglass, pear, apple, or rectangle) from bust, waist, and hip measurements.
Body Fat Percentage Calculator
Estimate your body fat percentage using the US Navy circumference method.
Body Surface Area Calculator
Calculate body surface area (BSA) in m² using the Mosteller, Du Bois or Haycock formula from your weight and height.