Health & Fitness

Estimate current pregnancy week from days remaining until the due date (280-day full term).

Estimate the likely ovulation day from the typical cycle length (ovulation ≈ 14 days before next period).

Calculate growth rate per month between two height or weight measurements.

Sum three independent scored categories into a total score, useful for clinical or assessment scoring scales.

Calculate alcohol units in a drink from volume and ABV percentage (UK units standard).

Estimate blood alcohol content using the Widmark formula from grams of alcohol consumed, body weight, and time.

Estimate remaining caffeine in the body after a given time using a 5-hour average half-life.

Calculate a medication dose from a mg-per-kg rate and body weight. For reference only — always confirm dosing with a clinician.

Calculate IV infusion drip rate from total volume, infusion time, and drop factor.

Estimate glomerular filtration rate using a simplified CKD-EPI style formula from serum creatinine, age, and sex.

Calculate a z-score for a measurement against a reference mean and standard deviation (e.g. growth charts).

Estimate daily formula intake using the common guideline of 2.5 oz per pound of body weight.

Estimate VO2 max using the Cooper 12-minute run test distance.

Estimate calories burned walking a given number of steps based on body weight.

Estimate body fat percentage using the US Navy circumference method for men.

Estimate lean body mass using the Boer formula.

Calculate waist-to-hip ratio and compare to general health ranges.

Estimate a daily water intake target from body weight.

Calculate body mass index from height and weight.

Estimate basal metabolic rate with the Mifflin-St Jeor formula.

Estimate total daily energy expenditure from BMR and activity multiplier.

Estimate heart rate training zones from age.

Calculate running pace from distance and time.

Estimate wake-up times based on 90-minute sleep cycles.

Estimate body fat percentage using a simple circumference formula.

Estimate ideal weight range using a common height-based formula.

Estimate daily water intake from body weight.

Split calories into protein, carbs, and fat targets by percentage.

Estimate heat index from temperature and relative humidity.

Estimate wind chill from temperature and wind speed.

Estimate one-rep max from weight and repetitions using the Epley formula.

Estimate target training heart rate using age, resting heart rate, and intensity.

Estimate daily protein target from body weight and grams per pound.

Estimate walking calories from body weight, distance, and calories per mile per pound.

Estimate daily calorie target from maintenance calories and desired deficit.

Estimate weeks to target weight from weight change and weekly pace.

Estimate miles from steps and stride length.

Predict race time from a known distance and time using the Riegel formula.

Estimate body surface area using the Mosteller formula.

Estimate daily calorie target from maintenance calories and desired surplus.

Estimate sweat rate from weight change, fluid intake, and workout time.

Estimate weekly sleep debt from target and actual sleep.

Calculate running or cycling power-to-weight ratio.

Calculate heart rate reserve from max and resting heart rate.

Calculate BMI from kilograms and centimeters.

Estimate calories burned from MET value, body weight, and duration.

Convert running pace in minutes per mile into speed.

Convert speed into running pace in minutes per mile.

Estimate VO2 max from 12-minute Cooper test distance.

Calculate strength training volume from sets, reps, and load.

Split a daily calorie target across meals and snacks.

Calculate running cadence from steps and time.