Health and Fitness Calculators

Blood Alcohol Calculator (Widmark) Estimate your blood alcohol in per mille from your drinks, body weight and sex with the Widmark formula, and the time until it falls to 0.0, 0.2 and 0.5.

Blood Type Inheritance Calculator (ABO and Rh) Enter both parents' ABO and Rh blood groups to see which blood groups their child could have, and the chance of each, from Mendel's rules.

BMR Calculator: Resting Energy and Daily Need Work out your basal metabolic rate (BMR) with the Mifflin-St Jeor and revised Harris-Benedict formulas, and your daily energy need for three activity levels.

Body Adiposity Index (BAI) Calculator Calculate your body adiposity index (BAI) from hip circumference and height, with no weight needed, and see the working and the estimated body fat it gives.

Body Fat Calculator (US Navy) Estimate your body fat from waist, neck and height measurements with the US Navy formula, see its ACE category and your fat and lean mass.

Body Surface Area Calculator (Five Formulas) Work out your body surface area in square metres from height and weight with the Mosteller, Du Bois, Haycock, Gehan and George and Boyd formulas, side by side.

Calories Burned Calculator by Activity Estimate the calories you burn walking, running or cycling from the Compendium of Physical Activities MET values, your weight and the time.

Child BMI Percentile Calculator (Ages 2 to 19) BMI-for-age percentile and z-score for children aged 2 to 19, from the WHO standards and the WHO 2007 reference, with WHO's classes from 5 years.

Child Growth Percentile Calculator (WHO) Work out your child's weight, length or height and head percentiles from the WHO growth standards (0 to 5 years) and the WHO reference (5 to 19 years).

Conception Date Calculator: Fertile Window Estimate when conception most likely happened from your last period, a known due date or a known conception date, with the fertile window and the due date.

Daily Calorie Calculator Find your daily calorie target for losing, keeping or gaining weight, with your resting energy, daily need and the grams of protein, fat and carbohydrate.

Daily Protein Calculator by Weight and Goal Work out how many grams of protein you need a day from your weight and your goal, with the RDA for healthy adults and the ranges for training.

Drink Calorie Calculator Estimate the calories in a drink: 7 kcal per gram of alcohol and 4 kcal per gram of sugar or carbohydrate. Enter the volume, the strength and the sugar.

HbA1c to Average Glucose Calculator Convert an HbA1c result to estimated average glucose in mg/dL and mmol/L with the ADA formula, and to the other HbA1c unit. Not medical advice.

Ideal Weight Calculator Get the ideal weight by the Devine, Robinson, Miller and Hamwi formulas, and the weight range for a healthy BMI, from your height and sex.

IVF Due Date Calculator (Transfer or Retrieval) Work out the due date after IVF from your embryo transfer (a day 3 or day 5 embryo) or your egg retrieval date, with the gestational age today and the timeline.

Karvonen Heart Rate Calculator (Target by Intensity) Work out your Karvonen target heart rate at 50 to 90 percent intensity from your resting heart rate and the Tanaka maximum, with the working shown.

Lean Body Mass Calculator (Boer, James, Hume) Estimate your lean body mass in kilograms with the Boer, James and Hume formulas, or from your body fat percentage, and compare the results in one table.

Macro Calculator: Protein, Fat and Carbs per Day and Meal Split your daily calories into protein, fat and carbohydrate for balanced, low-carb or high-protein eating, with the grams per day and per meal.

Ovulation Calendar Estimate ovulation, fertile window and period dates for several cycles from last period, cycle length and luteal phase. An estimate, not contraception.

Period Calculator: Next Periods and Fertile Window Estimate your next period, ovulation and fertile window, and the next six cycles, from the first day of your last period and your cycle length.

Pregnancy Calendar Work out your estimated due date and current pregnancy week from your last period, conception, a known due date or an IVF transfer, with a week-by-week table.

Pregnancy Weight Gain Calculator Find the total gain the Institute of Medicine recommends for your BMI group, and the range expected at your pregnancy week, with the gain so far compared.

Sleep Cycle Calculator: Bedtimes and Wake-Up Times Enter a wake-up time or a bedtime and get the times that fit four, five or six 90-minute sleep cycles, allowing 15 minutes to fall asleep.

Smoking Cost Calculator See what your cigarettes cost a day, a month, a year and over ten years, and the money you keep if you stop. Enter the pack price and how many a pack holds.

Standard Drinks Calculator Count the standard drinks and UK units in one drink from its volume and strength, using the US standard of 14 grams and the NHS unit of 10 ml of pure alcohol.

Waist-Hip Ratio Calculator Work out your waist-hip ratio and waist-to-height ratio from your measurements, and see each result against the WHO limits for men and women.

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