Health calculators
Body metrics with common reference formulas.
BMI Calculator
Body Mass Index from height and weight (metric).
BMR Calculator
Basal metabolic rate (Mifflin–St Jeor).
Ideal Weight Calculator
Devine formula ideal body weight.
TDEE Calculator
Total daily energy expenditure from BMR × activity.
Body Fat Calculator
US Navy body fat estimate from tape measurements.
Pregnancy Due Date Calculator
Estimated due date from last menstrual period (Naegele).
Macro Calculator
Split daily calories into protein, carbs, and fat grams.
Running Pace Calculator
Pace per km or mile from distance and time.
Ovulation Calculator & Fertile Window
Estimate ovulation day and fertile window from LMP.
Daily Water Intake Calculator by Weight
Rough daily water goal from body weight.
Heart Rate Zone Calculator
Training zones from age using max HR ≈ 220 − age.
One-Rep Max Calculator
Estimate 1RM from weight and reps (Epley).
Waist-Hip Ratio Calculator
Waist ÷ hip circumference ratio.
Calories Burned Calculator
Estimate calories from MET, weight, and duration.
Body Surface Area Calculator
BSA with the Mosteller formula.
Lean Body Mass Calculator
Estimate LBM from weight and body-fat %.
Sleep Cycle Calculator
Suggested wake times from bedtime (90-min cycles).
Protein Intake Calculator
Daily protein target from weight and activity.