Health and Fitness

  • Maximum Heart Rate Calculator (220 - Age)
    Estimate your maximum heart rate with the simple Fox formula (220 - age) and see your 50%-85% target training zones in bpm.
  • Fahrenheit to Celsius Fever Calculator
    Convert body temperature between Fahrenheit and Celsius and instantly see whether the reading reaches the 38 °C / 100.4 °F fever threshold.
  • Pace to Speed Converter
    Convert running pace (min/mile) to speed (mph) and back instantly. Also shows km/h and min/km equivalents for easy treadmill and race planning.
  • One-Rep Max (1RM) Calculator
    Estimate your one-rep max (1RM) for deadlift, squat, or bench from reps and weight using the Epley and Brzycki formulas. Free, fast, and accurate.
  • Cooper 12-Minute Run Test Calculator
    Estimate your VO2 max from the Cooper 12-minute run test. Enter the distance covered in meters to get your aerobic fitness score instantly.
  • VO2 Max Estimate Calculator (Cooper Test)
    Estimate your VO2 max from the Cooper 12-minute run test. Enter meters covered in 12 minutes to get your aerobic fitness score in mL/kg/min.
  • NIHSS Stroke Scale Calculator
    Calculate the NIH Stroke Scale (NIHSS) by summing 11 neurological items for a total stroke severity score from 0 to 42 with category.
  • Naps Needed Calculator
    Estimate how many naps per day are needed from total daytime sleep hours and average nap length. Free, instant nap schedule calculator for babies and adults.
  • Body Surface Area (BSA) Calculator
    Calculate your Body Surface Area (BSA) in m² using the Mosteller formula from your height (cm) and weight (kg). Fast, accurate clinical tool.
  • Due Date from Ovulation/Conception Calculator
    Calculate your estimated due date (EDD) from your ovulation or conception date by adding 266 days (38 weeks). Fast, free pregnancy date tool.
  • Fertile Window Calculator
    Estimate your most fertile days and ovulation date from your last period and cycle length. Find your 6-day fertile window to plan conception.
  • Total Recommended Pregnancy Weight Gain Calculator
    Estimate your recommended total pregnancy weight gain in kg from your pre-pregnancy BMI using the IOM 2009 guidelines for a single baby.
  • Running Calories Burned Calculator
    Estimate net calories burned running from your body weight and distance. Free running calorie calculator using the simple 1.036 × kg × km formula.
  • Cholesterol Unit Converter (mg/dL ↔ mmol/L)
    Convert cholesterol and triglyceride values between mg/dL and mmol/L instantly. Uses 38.67 for cholesterol and 88.57 for triglycerides.
  • Gestational Age from LMP Calculator
    Calculate gestational age in weeks and days from the last menstrual period (LMP). Enter the LMP date and today's date to get exact pregnancy weeks.
  • Blood Glucose Unit Converter
    Convert blood glucose between mg/dL and mmol/L instantly. Enter a value and unit to switch between US and international glucose measurement units.
  • Heart Rate as Percent of Max Calculator
    Calculate your current heart rate as a percentage of your estimated maximum heart rate (220 − age). Find your training intensity zone instantly.
  • Body Fat % to Lean & Fat Mass Calculator
    Convert your body fat percentage and weight into fat mass and lean body mass instantly. Works with kg or lb — simple, accurate, and free.
  • Katch-McArdle BMR Calculator
    Calculate your Basal Metabolic Rate with the Katch-McArdle formula using lean body mass and body fat percentage. Free, accurate BMR estimate.
  • Mosteller Body Surface Area (BSA) Calculator
    Calculate body surface area (BSA) in m² using the Mosteller formula from weight (kg) and height (cm). Fast, accurate, and clinically common.
  • Weight Loss Percentage Calculator
    Calculate your weight loss percentage from starting and current weight. Find what percent of your body weight you've lost in any unit (lb or kg).
  • Percentage of 1RM Calculator
    Calculate your training weight as a percentage of your one-rep max (1RM). Enter your 1RM and target percentage to get the load to lift.
  • How Many Weeks Pregnant Am I?
    Find out how many weeks and days pregnant you are from your last menstrual period (LMP). Enter your LMP and an as-of date to get gestational age instantly.
  • Time to Metabolize Alcohol Calculator
    Estimate how many hours it takes to metabolize alcohol from your current BAC, using the average elimination rate of 0.015% per hour.

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