Health & Fitness Calculators
Everyday health and fitness numbers, from BMI and calorie targets to running pace and alcohol units. They give general information based on published formulas and NHS guidance, not a diagnosis. If a result worries you, speak to your GP or call NHS 111.
BMI Calculator
Calculate your Body Mass Index and check if you're at a healthy weight.
TDEE Calculator
Calculate your Total Daily Energy Expenditure and BMR using Mifflin-St Jeor. See calorie targets for cutting, maintenance and bulking.
Calorie Deficit Calculator
Calculate your daily calorie target for weight loss or gain. Personalised to your stats and goal, with an estimated timeline to reach your target weight.
Alcohol Units Calculator
Add up the alcohol units in your weekly drinks and compare them with the UK low-risk guideline of 14 units. Includes calories and cost.
Blood Pressure Checker
Enter your blood pressure reading and instantly find your NHS category, Normal, Elevated, High Stage 1/2, or Hypertensive Crisis, with health advice.
Pregnancy Calculator Suite
Comprehensive pregnancy tools including due date calculator, gestational age tracker, and weight gain guidance.
Body Fat Calculator
Estimate body fat percentage using the US Navy tape measure method. Includes BMI, fat mass, lean mass and category.
Ideal Body Weight Calculator
Estimate your ideal body weight using the Devine, Robinson, Miller and Hamwi formulas, plus the healthy BMI weight range.
Macro Calculator
Calculate daily calories (TDEE) and macronutrient targets (protein, carbs, fat) for fat loss, maintenance or muscle gain.
One-Rep Max Calculator
Estimate your one-rep max (1RM) from any weight and rep count using the Epley, Brzycki and Lombardi formulas, plus a training percentage chart.
Ovulation Calculator
Estimate your ovulation date, fertile window and next period based on your cycle length and luteal phase.
Running Pace Calculator
Calculate pace, finish times and splits for 5K, 10K, half marathon and marathon races. Convert between min/km, min/mile, mph and km/h.
Sleep Cycle Calculator
Find the best bedtime or wake-up time based on 90-minute sleep cycles to wake refreshed instead of groggy.
Stop Smoking Savings Calculator
See how much money you save and what NHS health milestones you hit after quitting smoking. UK GBP savings and life-regained estimate.
Target Heart Rate Calculator
Find your heart rate training zones for exercise using the Karvonen formula, from warm-up to maximum effort.
UK-WHO Growth Centile Calculator
Calculate growth centiles for children using UK-WHO growth charts. Weight, height, BMI and head circumference.
Waist-to-Height Ratio Calculator
Calculate your waist-to-height ratio (WHtR) in cm or inches and see your health risk category based on public health guidance.
Waist-to-Hip Ratio Calculator
Calculate your waist-to-hip ratio (WHR) in cm or inches and see your WHO health risk category based on your sex.
Water Intake Calculator
Estimate your recommended daily water intake based on weight, exercise, climate and pregnancy. Results in litres, pints and glasses.