Health Calculators

BMI Calculator

Calculate your Body Mass Index (BMI) instantly. Enter your height and weight to find your BMI score and what it means for your health.

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TDEE Calculator

Calculate your Total Daily Energy Expenditure (TDEE) — the exact number of calories you burn each day. Includes macro targets for fat loss, muscle gain, and maintenance.

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BMR Calculator

Find your Basal Metabolic Rate — the number of calories your body burns at complete rest just to keep you alive.

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Ideal Weight Calculator

Calculate your ideal healthy weight range based on your height and body frame. Uses multiple established medical formulas.

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Body Fat Percentage Calculator

Estimate your body fat percentage using the US Navy measurement method. Enter neck, waist, and hip measurements for an accurate body composition estimate.

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Daily Water Intake Calculator

Calculate exactly how much water you should drink daily based on your weight, activity level, climate, and whether you're pregnant or breastfeeding.

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Pregnancy Due Date Calculator

Calculate your pregnancy due date based on your last menstrual period or conception date. Includes week-by-week milestones.

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Sleep Calculator

Calculate the best bedtime or wake-up time to feel refreshed. Based on 90-minute sleep cycles to avoid waking during deep sleep.

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Heart Rate Zones Calculator

Calculate your 5 training heart rate zones based on your age and resting heart rate. Optimise fat burning, aerobic fitness, and performance.

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Blood Alcohol Content Calculator

Estimate your blood alcohol content (BAC) based on drinks consumed, weight, and time elapsed. Educational tool — never drink and drive.

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Waist-to-Hip Ratio Calculator

Calculate your waist-to-hip ratio (WHR) and find out what it means for your cardiovascular health risk. A better health indicator than BMI alone.

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Macros Calculator

Calculate your ideal daily macros — protein, carbohydrates, and fat — based on your TDEE, body composition goal, and dietary preference.

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Calorie Deficit Calculator

Calculate the calorie deficit needed to reach your target weight. See realistic timelines, daily calorie targets, weekly deficits, and protein targets during fat loss.

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Age Calculator

Calculate your exact age in years, months, days, hours, and minutes. Find the day of the week you were born and days until your next birthday.

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Waist-to-Hip Ratio Calculator

Calculate your waist-to-hip ratio and assess your cardiovascular health risk. WHO classification included.

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Lean Body Mass Calculator

Calculate your lean body mass (LBM) — the weight of everything except fat. Essential for accurate TDEE calculation and drug/supplement dosing.

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Ovulation & Fertile Window Calculator

Calculate your fertile window and predicted ovulation date based on your last period and cycle length.

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Calories From Macros Calculator

Calculate total calories from protein, carbohydrates, and fat. Verify nutrition labels and understand the calorie breakdown of any food.

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Age Difference Calculator

Calculate the exact age difference between two people or dates in years, months, and days.

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Blood Pressure Range Checker

Check what your blood pressure reading means. See if your systolic and diastolic values are normal, elevated, or hypertensive.

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Child BMI Calculator (UK)

Calculate BMI for children aged 2–18 using UK centile charts. Results are presented as a centile rather than adult BMI categories.

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Daily Protein Requirement Calculator

Calculate your optimal daily protein intake based on weight, activity level, and fitness goal. Separate from macro calculator — focused on protein.

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Target Weight Loss Timeline Calculator

Calculate how long it will take to reach your target weight at a given rate of loss. See realistic timelines based on safe, sustainable weight loss rates.

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Height & Weight Converter

Convert height between feet/inches and centimetres. Convert weight between pounds, stone, and kilograms. Essential for medical forms and international use.

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