Health Calculators
21 calculators, all running in your browser. Nothing you type is sent to us, stored, or read back later.
Body measurements
Where you stand right now — weight, shape and composition.
- BMI Calculator Body mass index from your height and weight, with the weight range that would put you in the healthy band.
- BMR & Daily Calorie Calculator Your basal metabolic rate and the calories you actually burn in a day, at five activity levels.
- Ideal Weight Calculator Four classic ideal-weight formulas side by side, plus the healthy weight range for your height.
- Body Fat Percentage Calculator The US Navy tape method — body fat percentage from a few measurements with a tape measure.
- Waist-to-Hip Ratio Calculator Where you carry weight matters more than how much. Waist-to-hip and waist-to-height, with WHO risk bands.
- Lean Body Mass Calculator Everything you weigh that is not fat — muscle, bone, organs and water — by three published formulas.
- Child & Teen BMI Percentile Calculator BMI read against CDC growth reference percentiles for children and teenagers aged 2 to 20.
Nutrition & fitness
Calories in, calories out, and what to eat around them.
- Macro Calculator Split a daily calorie target into grams of protein, carbohydrate and fat.
- Protein Intake Calculator How much protein a day for your body weight and what you are training for.
- Daily Water Intake Calculator A daily fluid target from your weight, your training and the weather where you live.
- Calories Burned Calculator Energy burned in a session, from MET values for more than forty activities.
- Target Heart Rate Zone Calculator Maximum heart rate and five training zones, by the Karvonen method if you know your resting rate.
- Weight Loss Calculator A daily calorie target to reach a goal weight at a chosen rate, with the date you would get there.
Pregnancy & cycle
Dates, windows and week-by-week ranges.
- Pregnancy Due Date Calculator Estimated due date from your last period, conception date, IVF transfer or a dating scan.
- Ovulation & Fertile Window Calculator Your likely ovulation day and six-day fertile window, for the next three cycles.
- Period Date Calculator The dates of your next six periods, with the fertile window marked in each cycle.
- Pregnancy Weight Gain Calculator The Institute of Medicine recommended gain for your pre-pregnancy BMI, week by week.
Readings & results
Make sense of the numbers on a test report.
- Blood Pressure Category Calculator What your systolic and diastolic reading means, on the ACC/AHA categories.
- HbA1c to Average Blood Sugar Converter Convert between HbA1c and estimated average glucose, in mg/dL or mmol/L, with the diagnostic bands.
- Cholesterol Ratio Calculator Total-to-HDL ratio, non-HDL cholesterol and a calculated LDL from a standard lipid panel.
- Sleep Cycle Calculator Bedtimes and wake times that land at the end of a sleep cycle rather than in the middle of one.
Try one now
The most-used calculator on the site, right here.
BMI Calculator
Body mass index from your height and weight, with the weight range that would put you in the healthy band.