Health & Fitness
Health & Fitness Calculators
Free health and fitness calculators. Check your BMI, work out daily calorie needs, calculate macros and estimate body fat — using established, evidence-based formulas.
BMI Calculator
Check your body mass index with NHS ranges
Calorie Calculator
Work out your daily calorie needs
TDEE Calculator
Calculate total daily energy expenditure
Macro Calculator
Get your ideal protein, carbs and fat split
Body Fat
Estimate your body fat percentage
Ideal Weight
Find your ideal weight range by height and frame
Health & Fitness Calculators
These calculators use well-established formulas like Mifflin-St Jeor and Harris-Benedict to give you useful estimates for calorie needs, body composition and healthy weight ranges. They are for general guidance only and are not a substitute for medical advice.
For clinically reviewed health information and a trusted BMI tool, visit nhs.uk BMI calculator.