Health

Estimate your body fat percentage using the U.S. Army circumference-based tape-test method (AR 600-9) and compare against Army standards by age band.

Calculate your Body Mass Index (BMI) and understand your health status with our interactive tool.

Calculate your body fat percentage, body fat mass, and lean body mass using the U.S. Navy Method and BMI Method. Plan your fitness journey with our interactive tool.

Calculate your Body Roundness Index (BRI), a measure of body shape and central fat that uses only height and waist circumference. Shows the waist-to-height ratio too. Free, private, for information only.

Calculate your Body Surface Area (BSA) using the Mosteller and DuBois formulas from your height and weight.

Estimate your body type (ectomorph, mesomorph, or endomorph) using the wrist-circumference-to-height frame-size ratio.

Calculate your fat-free mass index (FFMI) and height-normalised FFMI from weight, height and body fat percentage, with lean and fat mass. Metric and imperial units. Free, private, for information only.

Calculate your healthy weight range based on your height using the WHO healthy BMI band (18.5-25).

Free ideal weight calculator using Hamwi, Devine, Robinson & Miller formulas. Get your ideal body weight by height, age, and sex in seconds.

Calculate your lean body mass (fat-free mass) using the Boer, James, and Hume formulas from just your height, weight, and sex.

Calculate how much excess weight you're carrying above the healthy BMI ceiling, plus a realistic safe weight-loss timeline.

Estimate your body fat percentage with the Relative Fat Mass (RFM) formula, which needs only your height and waist measurement. Includes the standard body-fat ranges. Free, private, for information only.

Calculate your waist-to-height ratio and see which health-risk band it falls in, with your target waist for a ratio of 0.5. Metric and imperial units. Free, private, and for information only.

Calculate your waist-to-hip ratio (WHR) from two tape-measure readings and see how it compares to WHO health-risk categories for your sex.

Free alcohol units calculator. Add your usual drinks to see UK alcohol units, US standard drinks, grams of pure alcohol and calories per week, compared with the 14-unit low-risk guideline.

Calculate your Basal Metabolic Rate (BMR) using the Mifflin-St Jeor, Revised Harris-Benedict, and Katch-McArdle formulas.

Add your coffee, tea, energy drinks and more to total your daily caffeine, compare it with a healthy limit and see how much is still in your body at bedtime and when it drops below your sleep cut-off. Free and private.

Estimate your daily calorie needs using science-backed BMR equations. Plan weight loss, maintenance, or gain with our interactive calorie calculator.

Work out the daily calorie deficit and calorie target for your weight-loss pace, how many weeks it takes and your estimated goal date, with warnings for fast paces or very low calories. kg and lb. Free and private.

Calculate calories burned during exercise using MET (Metabolic Equivalent of Task) values for common activities.

Free cal to joule converter. Instantly convert calorie to joule, kcal to kJ, and food Calories to kilojoules with exact 4.184 factor.

Calculate your recommended daily carbohydrate intake in grams based on your calorie needs and the Acceptable Macronutrient Distribution Range.

Calculate your recommended daily water intake based on your weight and activity level.

Calculate your recommended daily fat intake in grams based on your calorie needs and the Acceptable Macronutrient Distribution Range.

Calculate your daily protein, carbohydrate, and fat targets in grams based on your calorie needs and macro split preference.

Calculate your recommended daily protein intake in grams based on your body weight, activity level, and goal.

Calculate your Total Daily Energy Expenditure (TDEE) using the Mifflin-St Jeor BMR equation and an activity-multiplier breakdown.

Find which plates to put on each side of the barbell for a target weight, using the plates you actually have. Shows the fewest plates, and the closest loads when the exact weight is not possible. Kilograms or pounds.

Estimate your one-rep max (1RM) from a submaximal set using the Epley and Brzycki formulas, plus a training percentage table.

Predict your finish time for a race distance from a recent result, using Riegel’s formula. See your pace, speed and predicted times for every standard distance from the mile to the marathon. Free and private.

Estimate pace, time, and distance for running, walking, or biking. Includes multipoint calculations, converters, and finish time predictions.

Convert a daily step count into an estimated distance walked and calories burned, based on your height and weight.

Calculate your target heart rate training zone using the Karvonen method, based on your age and resting heart rate.

Estimate your VO2 max (aerobic fitness) from your age and resting heart rate using the Uth-Sorensen-Overgaard-Pedersen non-exercise formula.

Calculate your Wilks and DOTS powerlifting scores from body weight, sex and total lifted, in kg or lb, and see the coefficients used. Compare lifters of different sizes fairly. Free and private.

Estimate the likely conception date range from a known due date or birth date, using the reverse of Naegele's Rule.

Calculate your estimated due date from your last period, conception date, IVF transfer date, or an ultrasound scan.

Free hCG doubling time calculator. Enter two beta-hCG blood test results and the hours or days between them to get the doubling time and the percentage rise per 48 hours.

Predict your ovulation day and fertile window for your next few cycles based on your last period and average cycle length.

Predict your next several menstrual period start and end dates based on your last period and average cycle length.

Calculate your due date, current gestational age, and trimester milestones from your last menstrual period.

Calculate your recommended total pregnancy weight gain range and weekly gain rate based on your pre-pregnancy BMI, using IOM guidelines.

Convert between A1C percentage and estimated average glucose (eAG), in mg/dL or mmol/L, using the ADAG study formula -- works in both directions.

Estimate your blood alcohol concentration (BAC) using the Widmark formula. Informational only — not a breathalyzer substitute.

Enter a systolic and diastolic reading to see which American Heart Association blood pressure category it falls into -- Normal, Elevated, Hypertension Stage 1 or 2, or Hypertensive Crisis.

Estimate total blood volume from sex, height and weight using Nadler’s equation, and compare it with the Lemmens-Bernstein-Brodsky formula. Metric or imperial. For information only, not medical advice.

Calculate your total cholesterol to HDL ratio, non-HDL cholesterol and LDL to HDL ratio, with an LDL estimate from triglycerides. Works in mg/dL and mmol/L. Free, private, for information only.

Estimate creatinine clearance (mL/min) with the Cockcroft-Gault equation from age, sex, weight and serum creatinine, using actual, ideal or adjusted body weight. Metric and US units. For information only, not medical advice.

Estimate your kidney function using the race-free CKD-EPI 2021 creatinine equation for glomerular filtration rate (eGFR).

Free IV flow rate calculator for nursing students and clinicians. Work out the infusion rate in mL/h and the gravity drip rate in drops per minute from volume, time and drop factor, or the infusion time from a rate.

Calculate mean arterial pressure (MAP) and pulse pressure from systolic and diastolic blood pressure, and see whether MAP falls in the usual 70 to 100 mmHg range. Free, private, for information only.

Calculate pack-years from cigarettes per day and years smoked, across one or several periods, and see whether you meet the US criteria for annual lung cancer screening. Free, private, for information only.

Free QTc calculator. Correct the QT interval for heart rate with the Bazett, Fridericia, Framingham and Hodges formulas, from heart rate or RR interval, with sex-specific reference ranges.