Health and Fitness

  • VO2 Max Calculator — Cooper 12-Minute Run Test
    Estimate your VO2 max from the Cooper 12-minute run test. Enter the distance you ran in meters to get aerobic fitness in mL/kg/min.
  • BMI Calculator (Body Mass Index)
    Free BMI calculator. Enter your weight in kg and height in cm to find your Body Mass Index and weight category instantly using the standard WHO formula.
  • Pregnancy Week-by-Week Calculator
    Find out how many weeks pregnant you are using your last menstrual period (LMP). See your gestational age, trimester, and days until your due date.
  • Intermittent Fasting Window Calculator
    Plan your intermittent fasting schedule. Enter your eating window start time and pick 16:8, 18:6, 20:4 or 14:10 to see when fasting begins and ends.
  • Safe Period (Rhythm) Calculator
    Estimate your safe days and fertile window using the rhythm (calendar) method. Find low-fertility days based on your average menstrual cycle length.
  • Fat-Burning Heart Rate Zone Calculator
    Find your fat-burning heart rate zone (60–70% of max HR) by age. Free calculator using the 220-age formula to estimate your ideal cardio range.
  • Calories In vs Out Calculator
    Calculate your daily calorie balance (in vs out) using calories consumed, BMR and exercise. See net surplus or deficit and estimated weight change.
  • Treadmill Calories Burned Calculator
    Estimate calories burned running on a treadmill from your weight, speed, incline and duration using the ACSM running VO₂ equation.
  • Barbell Plate Calculator
    Calculate exactly which weight plates to load on each side of your barbell to reach a target weight. Uses standard 45/35/25/10/5/2.5 lb plates.
  • Cycling Power-to-Weight Ratio Calculator
    Calculate your cycling power-to-weight ratio (W/kg) by dividing power output in watts by body weight in kilograms. Compare your climbing fitness instantly.
  • Swim Pace Calculator
    Calculate your swimming pace per 100m and 50m from any distance and time. Get pace, speed in m/s and km/h instantly. Free swim pace calculator.
  • Intermittent Fasting Window Calculator
    Plan your intermittent fasting schedule. Enter your protocol (16:8, 18:6, 20:4, OMAD) and eating start time to get exact eating and fasting windows.
  • Steps to Distance Calculator
    Convert your daily steps into distance in kilometers and miles using your height and gender to estimate stride length. Free and accurate.
  • Goal Body Fat Weight Calculator
    Find your goal weight at a target body fat percentage. Enter current weight and body fat % to see goal weight, fat to lose, and lean mass.
  • RFM (Relative Fat Mass) Calculator
    Estimate your body fat percentage with the RFM (Relative Fat Mass) calculator using only height and waist circumference. Free, fast, and accurate.
  • Body Surface Area (Mosteller) Calculator
    Calculate Body Surface Area (BSA) using the Mosteller formula from height (cm) and weight (kg). Fast, accurate result in square meters (m²).
  • Goal Weight Date Calculator
    Estimate how many weeks and the target date to reach your goal weight from a daily calorie deficit, using the 7,700 kcal-per-kg rule.
  • Chinese Gender Predictor Calculator
    Predict baby boy or girl with the traditional Chinese gender calendar using mother's lunar age and the lunar conception month. For fun only.
  • Contraction Timer & Frequency Calculator
    Calculate labor contraction frequency and duration from start and end times. Find how far apart contractions are and how long each lasts.
  • Pregnancy Countdown Calculator
    Count down to your due date. Enter your due date and today's date to see exactly how many days and weeks are left until your baby arrives.
  • Trimester Calculator
    Find out which pregnancy trimester you are in based on your last menstrual period (LMP). Get your gestational week and days until your due date.
  • hCG Doubling Time Calculator
    Calculate hCG doubling time, total percent change, and rate of rise per day from two beta hCG blood test results taken hours apart.
  • Pre-Pregnancy BMI & Weight Gain Calculator
    Calculate your pre-pregnancy BMI and see the recommended total weight gain range for a healthy single pregnancy based on IOM guidelines.
  • Cardio Calorie Burn Calculator
    Estimate calories burned during cardio from your heart rate, weight, age, and duration using the Keytel heart-rate equations for men and women.

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