Health

Works out the daily calorie deficit a weight loss deadline demands, the intake it leaves you, and whether that pace is a sensible one.

Works out body surface area in square metres from height and weight using the Mosteller, Du Bois, Haycock and Gehan and George formulas side by side.

Sorts bust, waist and hip measurements into one of six named body shape bands using the FFIT for Apparel rule set, with every threshold printed.

Shows the 2009 Institute of Medicine weight gain range for your pre-pregnancy BMI and your current week, for one baby or twins.

Counts how many weeks and days along a pregnancy is on any date, from the last period or the due date, with the trimester and the time left.

Estimates mean arterial pressure from a cuff blood pressure reading using MAP = diastolic + (systolic - diastolic) / 3, with pulse pressure alongside.

Turn a target marathon or half marathon time into a full table of cumulative splits, with an optional negative split, plus a Riegel time prediction.

Estimates creatinine clearance with the Cockcroft-Gault equation from age, sex, weight and serum creatinine, reported in mL/min rather than as an eGFR.

Estimates the calories burned on a bike ride from weight, time and speed, and reports the total along with calories per hour and per mile.

Checks your waist-to-height ratio against the Army standard of under 0.55, the only body composition measure since Army Directive 2026-13 rescinded the tape test.

Estimates VO2 max from four field tests: a Cooper 12 minute run, a timed 1.5 mile run, the Rockport 1 mile walk, or your maximum and resting heart rates.

Turns body weight and a training goal into a daily protein target in grams, or converts a calorie total and protein percentage into grams.

Counts forward from your last period or a known ovulation date to the earliest date a home pregnancy test could give a reliable result.

An actuarial estimate of remaining years by age and sex, from a Gompertz-Makeham curve fitted to United States life tables, given as a population average.

Estimate LDL cholesterol from a fasting lipid panel with the Friedewald equation, in mg/dL or mmol/L, with non-HDL and the total to HDL ratio.

Find a child's weight, length or head circumference percentile from birth to 36 months against the CDC growth reference, with the z-score.

Estimates glomerular filtration rate from serum creatinine, age and sex using the race-free CKD-EPI 2021 equation or the four-variable MDRD equation.

Runs the three standard medication math checks: dose ordered over dose on hand times quantity, mg per kg by body weight, and IV drip rate.

Estimates what a walk burns from your weight and your speed, working either from the distance and the time or from a chosen pace, with calories per mile.

Estimates the calories an activity burns from your body weight, the minutes you spent on it and its MET value, with two dozen common activities built in.

See how long a goal weight takes at a given daily calorie deficit, or get a daily calorie target from your age, size, sex and activity level.

Turn a distance and a finish time into pace per mile and per kilometer, or work the other way and get a finish time from a target running pace.

Estimate your 1RM for the bench press, squat or any lift from the weight and reps of a working set, using the Epley or Brzycki formula.

Split a daily calorie target into grams of protein, carbohydrate and fat, using either a preset for your goal or your own percentage split.

Count forward from an embryo transfer date to an estimated due date, using the age of the embryo at transfer for day 3, day 5 and day 6 cycles.

Find a reference body weight for your height and sex with the Devine formula, plus the pound or kilogram range that falls inside a healthy BMI.

Estimate a pregnancy due date from the first day of the last period or from a known conception date, with the trimester dates and the 37 week full term mark.

Work back from a due date, a birth date or the first day of your last period to an estimated conception date and the likely window around it.

Estimate the calories you need each day from your sex, age, height, weight and activity level, with targets for losing or gaining weight.

Estimate body fat percentage from height, neck and waist measurements using the US Navy method, with fat mass, lean mass and a category for the result.

Estimate the calories your body burns at rest with the Mifflin St Jeor equation, then see daily totals for four common activity levels.

Calculate your Body Mass Index (BMI) with our free BMI Calculator. Determine if your weight is in the healthy range based on your height.

Calculate and visualize your biorhythm cycles with our free Biorhythm Calculator. Track physical, emotional, and intellectual rhythms based on your birth date.

Calculate the exact number of calories burned during sleep based on your personal metrics. Optimize your rest and weight management goals.