Heart Health Calculator

  • METs to VO2 Conversion Calculator
    Convert METs to VO2 oxygen consumption instantly. Enter activity intensity in METs to get VO2 in mL/kg/min, plus optional absolute VO2 in L/min.
  • Heart Rate from RR Interval Calculator
    Convert an ECG RR interval in milliseconds to heart rate in beats per minute (bpm) instantly using HR = 60000 / RR. Free, fast and accurate.
  • Ankle-Brachial Index (ABI) Calculator
    Calculate the Ankle-Brachial Index (ABI) from ankle and arm systolic blood pressures to screen for peripheral artery disease (PAD).
  • Pack-Years Calculator
    Calculate smoking pack-years from cigarettes per day and years smoked. Free tool using the standard pack-years formula for medical screening.
  • Salt to Sodium Converter
    Convert grams of salt to milligrams of sodium instantly. 1 g of salt equals 393.4 mg of sodium — track your daily sodium intake easily.
  • BMR Calculator (Mifflin-St Jeor)
    Calculate your Basal Metabolic Rate using the Mifflin-St Jeor equation. Enter weight, height, age and gender to find daily resting calories.
  • Creatinine Clearance Calculator (Cockcroft-Gault)
    Estimate creatinine clearance (CrCl) with the Cockcroft-Gault equation using age, weight, sex and serum creatinine. Get mL/min and a kidney function category.
  • METs to Calories Burned Calculator
    Convert METs to calories burned. Enter activity intensity (METs), body weight, and duration to estimate the energy you expend during exercise.
  • 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.
  • Modified Sgarbossa Criteria 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.
  • Body Surface Area Calculator
    Calculate body surface area (BSA) in m² using the Mosteller and DuBois & DuBois formulas. Enter height in cm and weight in kg.
  • Non-HDL Cholesterol Calculator
    Calculate your non-HDL cholesterol by subtracting HDL from total cholesterol. Enter mg/dL values to see your non-HDL level and risk category.
  • Triglyceride to HDL Ratio Calculator
    Calculate your triglyceride to HDL (TG/HDL) ratio from a lipid panel. Enter triglycerides and HDL in mg/dL to assess cardiometabolic risk.
  • 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.
  • Systemic Vascular Resistance Calculator
    Calculate systemic vascular resistance (SVR) from MAP, CVP and cardiac output. Get results in dynes·s·cm⁻⁵ and Wood units instantly.
  • Ejection Fraction Calculator (LVEF)
    Calculate left ventricular ejection fraction (LVEF) from end-diastolic and end-systolic volumes. EF% = ((EDV − ESV) / EDV) × 100, with classification.
  • 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.
  • Heart Rate Training Zones Calculator
    Calculate your max heart rate and the 5 training zones (50–90%) from your age using the 220−age formula. Free, instant heart rate zone calculator.
  • Maximum Heart Rate (MHR) Calculator
    Estimate your maximum heart rate from age using the Fox (220−age) or Tanaka (208−0.7×age) formula, plus 50/70/85% training zones in bpm.
  • Dog Heart Rate Calculator
    Calculate your dog's heart rate from beats counted in 15 seconds and check it against the normal bpm range for small, medium, or large dogs.
  • Deep Breathing Heart Rate Zone Calculator
    Find your relaxation heart rate zone for deep breathing. Enter your age to get max heart rate and the calming 50–60% target range in bpm.
  • Karvonen Heart Rate Calculator
    Find your target heart rate zone with the Karvonen formula using heart rate reserve. Enter age, resting heart rate and intensity to get your THR in bpm.
  • Target Heart Rate Zone Calculator
    Find your maximum heart rate and 5 exercise target heart rate zones in bpm using the Basic (%MHR) or Karvonen heart rate reserve method.
  • Specificity Calculator
    Calculate specificity (true negative rate) from TN and FP counts. Free, instant Specificity = TN / (TN + FP) calculator with worked example.

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