Health and fitness calculators

BMI in stone and pounds, calories, body fat, pregnancy dates and training zones.

Health calculators turn guidelines into numbers that fit your body. They're a starting point for a conversation with your GP, not a diagnosis.

Calculators

BMI Calculator (Stone and Pounds)
Calculate your Body Mass Index using feet, inches, stone and pounds.
BMR Calculator
Estimate your Basal Metabolic Rate – the calories your body uses at rest.
Calorie Calculator
Estimate the calories you need each day to maintain your current weight.
Body Fat Calculator
Estimate body fat percentage with the US Navy tape-measure method.
Healthy Weight Range Calculator
Find the healthy weight range for your height in kilograms and stone.
Water Intake Calculator
Estimate how much water to drink each day based on body weight and exercise.
Alcohol Units Calculator
Count UK alcohol units in a drink and compare your weekly total with the 14-unit guideline.
Pregnancy Due Date Calculator
Work out your estimated due date and how many weeks pregnant you are.
Ovulation Calculator
Estimate your ovulation day and fertile window from your cycle.
Heart Rate Zone Calculator
Work out your five training heart rate zones from your age and resting heart rate.
Running Pace Calculator
Work out your pace per km and per mile, and predict 10K, half marathon and marathon times.