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Cardiac Output (Q) Calculator

Calculate cardiac output from stroke volume, heart rate, cardiac output, and age.

Cardiac Output (Q) Calculator

Calculate cardiac output from stroke volume, heart rate, cardiac output, and age.

Input your cardiac output data

Formula

Cardiac output (Q) = stroke volume (mL/beat) × heart rate (beats/min) / 1000.

Cardiac index = cardiac output (L/min) / body surface area (m²). Normal range: 2.5-4.0 L/min/m².

Normal ranges: Cardiac output at rest: 4-8 L/min. Stroke volume: 60-100 mL/beat. Heart rate: 60-100 beats/min. Values vary with activity and individual factors.

Cardiac output is affected by heart rate, stroke volume, exercise, stress, medications, heart disease, and other factors affecting cardiovascular function.

Steps

Enter stroke volume if measured (mL/beat) from cardiac assessment.
Enter heart rate (beats/min) from pulse measurement.
Optionally enter cardiac output if measured (L/min).
Enter your age (cardiac output can change with age).
Review cardiac output, cardiac index, and recommendations.

Additional calculations

Enter your cardiac output data to see additional insights.

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Complete guide snapshot

Cardiac output (Q) is the volume of blood the heart pumps per minute, calculated as stroke volume × heart rate. Normal range at rest is approximately 4-8 L/min. Cardiac index (normalized to body surface area) is typically 2.5-4.0 L/min/m².

Use this calculator to assess cardiac output from stroke volume (optional), heart rate, cardiac output (optional), and age.

FAQs

What is cardiac output?

Cardiac output (Q) is the volume of blood the heart pumps per minute. It is calculated as stroke volume × heart rate. Normal range is approximately 4-8 L/min at rest.

How is cardiac output calculated?

Cardiac output = stroke volume (mL/beat) × heart rate (beats/min) / 1000. Stroke volume is the amount of blood pumped per heartbeat. Heart rate is beats per minute.

What are normal cardiac output values?

Normal cardiac output at rest: 4-8 L/min for adults. Cardiac index (cardiac output per body surface area) is typically 2.5-4.0 L/min/m². Values vary with activity level and individual factors.

What is stroke volume?

Stroke volume is the amount of blood pumped by the left ventricle per heartbeat. Normal range is approximately 60-100 mL/beat at rest. It depends on preload, afterload, and contractility.

What affects cardiac output?

Cardiac output is affected by heart rate, stroke volume, exercise, stress, medications, heart disease, blood volume, and other factors affecting cardiovascular function.

What is cardiac index?

Cardiac index is cardiac output normalized to body surface area (BSA). It accounts for body size differences. Normal range is 2.5-4.0 L/min/m². It is calculated as cardiac output / BSA.

Does age affect cardiac output?

Yes. Cardiac output may decrease slightly with age due to changes in heart function, stroke volume, and heart rate. Regular exercise can help maintain cardiac output.

Can I measure cardiac output at home?

Home measurement is limited. Cardiac output is typically measured in clinical settings using echocardiography, cardiac catheterization, or other specialized techniques. Heart rate and estimated stroke volume can provide estimates.

What about exercise?

Cardiac output increases significantly during exercise (up to 20-30 L/min in trained athletes). This is achieved through increased heart rate and stroke volume to meet increased oxygen demands.

When should I consult a healthcare provider?

Consult a healthcare provider if cardiac output is significantly abnormal, if you have symptoms (shortness of breath, fatigue, chest pain), or if you have concerns about cardiovascular function.

Summary

This tool calculates cardiac output from stroke volume (optional), heart rate, cardiac output (optional), and age.

Outputs include stroke volume, heart rate, cardiac output, cardiac index, status, recommendations, an action plan, and supporting metrics.

Formula, steps, guide content, related tools, and FAQs ensure humans or AI assistants can interpret the methodology instantly.

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Cardiac Output (Q) Calculator

Calculate cardiac output from stroke volume, heart rate, cardiac output, and age.

How to use Cardiac Output (Q) Calculator

Step-by-step guide to using the Cardiac Output (Q) Calculator:

Enter your values. Input the required values in the calculator form
Calculate. The calculator will automatically compute and display your results
Review results. Review the calculated results and any additional information provided

Frequently asked questions

How do I use the Cardiac Output (Q) Calculator?

Simply enter your values in the input fields and the calculator will automatically compute the results. The Cardiac Output (Q) Calculator is designed to be user-friendly and provide instant calculations.

Is the Cardiac Output (Q) Calculator free to use?

Yes, the Cardiac Output (Q) Calculator is completely free to use. No registration or payment is required.

Can I use this calculator on mobile devices?

Yes, the Cardiac Output (Q) Calculator is fully responsive and works perfectly on mobile phones, tablets, and desktop computers.

Are the results from Cardiac Output (Q) Calculator accurate?

Yes, our calculators use standard formulas and are regularly tested for accuracy. However, results should be used for informational purposes and not as a substitute for professional advice.