Health and Fitness Calculators
BMI, calories, body fat, pregnancy, pace and heart-rate calculators.
BMI Calculator
Body Mass Index with WHO and Asian Indian categories.Calorie Calculator
Daily calories to maintain, lose or gain weight.BMR Calculator
Basal metabolic rate with three formulas, plus daily calories by activity.Body Fat Calculator
Body fat % from a tape measure, using the US Navy method.Ideal Weight Calculator
Healthy weight range for your height, with four classic formulas.Pregnancy Due Date Calculator
Due date, weeks pregnant and milestones from your last period or IVF.Ovulation Calculator
Your fertile window, ovulation day and next six cycles.Macro Calculator
Grams of protein, carbs and fat for your calories and diet style.Water Intake Calculator
How much water to drink a day, in litres or fluid ounces.Sleep Calculator
Bedtimes and alarm times that line up with 90-minute sleep cycles.Pace Calculator
Running pace, finish time and race predictions for 5K to marathon.One Rep Max Calculator
Estimate your 1RM and training weights from any set.Heart Rate Zone Calculator
Max heart rate and five training zones, with the Karvonen option.
Health and fitness calculators
Quick, private estimates for everyday health and fitness questions: Is my weight in a healthy range? How many calories do I burn? When is my baby due? What pace do I need for a personal best? Each calculator explains the formula it uses — such as the Mifflin-St Jeor equation for calories or the US Navy method for body fat — and works in metric or US units. Visitors from the United States see feet, inches and pounds by default; everyone else sees centimetres and kilograms, and you can switch at any time.
- Body: BMI, body fat, ideal weight and BMR.
- Food and drink: calories, macros and water intake.
- Pregnancy: due date and ovulation.
- Training: running pace, one-rep max and heart-rate zones.
- Rest: a sleep calculator based on 90-minute sleep cycles.
These tools give general estimates for healthy adults. They are not medical advice and can’t replace a doctor, midwife, dietitian or coach who knows your situation. Your measurements stay on your device — nothing you enter is uploaded.