Health and Fitness

  • Maintenance Calories Calculator
    Calculate your maintenance calories (TDEE) from BMR and activity level using the Mifflin-St Jeor equation. See loss and gain targets too.
  • 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).
  • Time Until Due Date Calculator
    Find out how many weeks pregnant you are and how many days remain until your due date, based on your last menstrual period (LMP) and a 280-day gestation.
  • 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.
  • Heart Rate Variability (RMSSD) Calculator
    Calculate RMSSD heart rate variability from RR intervals. Also returns SDNN, mean RR interval and average heart rate from your beat-to-beat data.
  • Pulse Pressure Calculator
    Calculate pulse pressure from systolic and diastolic blood pressure (SBP − DBP). Also estimates mean arterial pressure (MAP) in mmHg.
  • 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.
  • Weight Gain Calorie Calculator
    Find how many calories per day you need to gain weight. Calculates your TDEE plus a bulking surplus from your target weekly weight gain.
  • MAP from Blood Pressure Calculator (DBP + ⅓ Pulse Pressure)
    Calculate Mean Arterial Pressure (MAP) from systolic and diastolic blood pressure using MAP = DBP + (SBP − DBP)/3. Fast, free estimate.

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