These calculators cover key cardiovascular metrics — from checking your Cholesterol Ratio and estimating VO2 Max to finding your aerobic training zones with the Target Heart Rate Calculator or the more precise Karvonen Formula version. Clinical tools like the QTc Calculator and Rate Pressure Product Calculator give deeper insight into cardiac workload, while the Estimated Average Glucose Calculator bridges heart and metabolic health.
Browse the most-popular list to see which tools other visitors rely on, or open the Trending tab to see what's gaining attention. Every calculator is free, requires no sign-up, and works on any device.
- Body Composition Calculator
- Metabolism Calculator
- Nutrition Calculator
- Heart Health Calculator
- Pregnancy Calculator
- Fitness Calculator
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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.
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Heart Rate as Percent of Max CalculatorCalculate your current heart rate as a percentage of your estimated maximum heart rate (220 − age). Find your training intensity zone instantly.
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Normal Heart Rate by Age CalculatorFind the normal resting heart rate range (BPM) by age for children and adults, plus tachycardia and bradycardia thresholds. Educational guide only.
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Heart Rate and Lifespan Relationship CalculatorEstimate approximate lifespan from resting heart rate using the "fixed total lifetime heartbeats" hypothesis. Novelty/educational tool, not medical advice.
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Ejection Fraction Calculator (LVEF)Calculate left ventricular ejection fraction (LVEF) from end-diastolic and end-systolic volumes. EF% = ((EDV − ESV) / EDV) × 100, with classification.
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Mean Arterial Pressure (MAP) CalculatorCalculate Mean Arterial Pressure (MAP) from systolic and diastolic blood pressure. MAP = DBP + (SBP − DBP)/3. Instant mmHg result and pulse pressure.
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Heart Rate from RR Interval CalculatorConvert an ECG RR interval in milliseconds to heart rate in beats per minute (bpm) instantly using HR = 60000 / RR. Free, fast and accurate.
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ECG Boxes to Seconds CalculatorConvert ECG small or large boxes to seconds and milliseconds at 25 or 50 mm/s. One small box = 0.04 s, one large box = 0.20 s. Get heart rate too.
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Rate Pressure Product CalculatorCalculate Rate Pressure Product (RPP) instantly: multiply heart rate by systolic blood pressure to estimate myocardial oxygen demand and cardiac workload.
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Body Surface Area CalculatorCalculate body surface area (BSA) in m² using the Mosteller and DuBois & DuBois formulas. Enter height in cm and weight in kg.
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Modified Sgarbossa Criteria CalculatorCalculate RMSSD heart rate variability from RR intervals. Also returns SDNN, mean RR interval and average heart rate from your beat-to-beat data.
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Waist Circumference Percentile CalculatorCheck your abdominal-obesity health risk from waist circumference. Men >102cm/40in and women >88cm/35in flag high risk. Free, instant, cm or inches.
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Creatinine Clearance (IBW) CalculatorEstimate creatinine clearance (CrCl) with the Cockcroft-Gault equation using age, weight, sex, and serum creatinine. Result in mL/min for renal dosing.
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Deep Breathing Heart Rate Zone CalculatorFind 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.
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QTc Calculator (Corrected QT Interval)Calculate the corrected QT interval (QTc) from QT and heart rate using the Bazett, Fridericia, Framingham, or Hodges correction formulas.
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Target Heart Rate Zone CalculatorFind your maximum heart rate and 5 exercise target heart rate zones in bpm using the Basic (%MHR) or Karvonen heart rate reserve method.
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Fat-Burning Heart Rate Zone CalculatorFind 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.
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Cardio Calorie Burn CalculatorEstimate 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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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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Triglyceride to HDL Ratio CalculatorCalculate your triglyceride to HDL (TG/HDL) ratio from a lipid panel. Enter triglycerides and HDL in mg/dL to assess cardiometabolic risk.
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Non-HDL Cholesterol CalculatorCalculate your non-HDL cholesterol by subtracting HDL from total cholesterol. Enter mg/dL values to see your non-HDL level and risk category.
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Systemic Vascular Resistance CalculatorCalculate systemic vascular resistance (SVR) from MAP, CVP and cardiac output. Get results in dynes·s·cm⁻⁵ and Wood units instantly.
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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.
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Pack-Years CalculatorCalculate smoking pack-years from cigarettes per day and years smoked. Free tool using the standard pack-years formula for medical screening.
Frequently asked questions
What heart health metrics can these calculators estimate?
You can assess aerobic capacity with the VO2 Max Calculator, find safe training zones with the Target Heart Rate and Karvonen Formula calculators, evaluate cardiac efficiency via the Rate Pressure Product, review cholesterol balance with the Cholesterol Ratio Calculator, and track average glucose levels with the eAG Calculator.
How accurate are the results, and can I use them for clinical decisions?
Tools like the QTc Calculator and Rate Pressure Product Calculator apply standard clinical formulas. However, all outputs are estimates based on your input values — they are NOT a substitute for medical advice or professional diagnosis. Always consult a qualified healthcare professional or clinician before acting on any cardiovascular health information.
What is the Karvonen Formula Target Heart Rate Calculator used for?
It uses your resting heart rate alongside your maximum heart rate to set training zones personalized to your current fitness level — more precise than the basic age-subtracted formula. It's widely used by endurance athletes and personal trainers for structuring cardio sessions at the right intensity.
Do you save any of the health data I enter?
No. Every calculation runs entirely in your browser. Heart rate values, cholesterol numbers, ECG intervals, and any other inputs are never transmitted to our servers or stored between sessions.
Which heart health calculators are used most?
The page is ordered by real visitor usage. Open the Trending tab to see which tools are getting the biggest recent boost in traffic, or the Recently Added tab for the newest tools in the collection.
