Heart Health Calculator

  • Max Heart Rate Calculator (Tanaka Formula)
    Estimate your maximum heart rate from age using the Tanaka formula (208 − 0.7 × age). Get bpm plus moderate and vigorous training heart-rate zones.
  • Target Heart Rate Zone Calculator (Karvonen)
    Calculate your target heart rate training zone using the Karvonen formula based on age, resting heart rate, and exercise intensity percentage.
  • Normal Heart Rate by Age Calculator
    Find the normal resting heart rate range (BPM) by age for children and adults, plus tachycardia and bradycardia thresholds. Educational guide only.
  • Corrected Sodium Calculator (Hyperglycemia)
    Calculate corrected serum sodium in hyperglycemia. Adds 1.6 (or 2.4) mEq/L per 100 mg/dL glucose above 100. For clinical education only.
  • Cooper 12-Minute Run VO2 Max Calculator
    Estimate your VO2 max from the Cooper 12-minute run test. Enter distance in meters to calculate aerobic fitness instantly with the Cooper formula.
  • Katch-McArdle BMR Calculator
    Calculate your Basal Metabolic Rate with the Katch-McArdle formula using body weight and body fat percentage for a lean-mass based estimate.
  • Fractional Excretion of Sodium (FENa) Calculator
    Calculate the Fractional Excretion of Sodium (FENa%) from urine and plasma sodium and creatinine to help differentiate prerenal from intrinsic acute kidney injury.
  • 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.
  • 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.
  • 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.
  • 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.
  • Steps to Calories Calculator
    Convert daily steps into calories burned. Enter steps, body weight and stride length to estimate kcal and distance walked instantly.
  • 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.
  • Mean Arterial Pressure (MAP) Calculator
    Calculate Mean Arterial Pressure (MAP) from your systolic and diastolic blood pressure using MAP = DBP + (SBP − DBP)/3. Free, instant.
  • PERC Rule Calculator
    PERC Rule Calculator checks all 8 criteria (age, heart rate, SpO2, hemoptysis, estrogen, VTE, surgery, leg swelling) to rule out pulmonary embolism.
  • Wells Score for DVT Calculator
    Calculate the Wells Score for deep vein thrombosis (DVT) by summing 10 weighted clinical criteria to stratify low, moderate, or high pretest probability.
  • TIMI Risk Score for UA/NSTEMI Calculator
    Calculate the TIMI Risk Score for unstable angina and NSTEMI by summing 7 clinical risk factors to estimate 14-day adverse event risk.
  • Wells Score for Pulmonary Embolism Calculator
    Calculate the Wells Score for pulmonary embolism (PE). Add weighted clinical criteria to estimate PE probability with three-tier and two-tier risk.
  • 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.
  • Specificity Calculator
    Calculate specificity (true negative rate) from TN and FP counts. Free, instant Specificity = TN / (TN + FP) calculator with worked example.
  • Sensitivity Calculator
    Calculate sensitivity (true positive rate) from true positives and false negatives. Free online tool for diagnostic tests and ML classifiers.
  • False Positive Rate Calculator
    Calculate the false positive rate (FPR) from false positives and true negatives. FPR = FP / (FP + TN) = 1 - specificity. Free online tool.
  • Triathlon Heart Rate Training Zones Calculator
    Calculate sport-specific run and bike heart rate training zones for triathlon from your lactate threshold heart rate (LTHR) using the Joe Friel method.

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