Rate Pressure Product Calculator (double product, heart rate × systolic BP)

Understanding the rate pressure product calculator — concept and principle

The rate pressure product (RPP), also called the double product, multiplies heart rate by systolic blood pressure. It is a simple, non-invasive index of how much oxygen the heart muscle needs. This calculator gives the resting and peak exercise values and how much RPP rises during exercise.

Heart rate × systolic: with the default inputs the result is × 2.94 (rise of 17,322).

How it is calculated

RPP = heart rate (beats/min) × systolic blood pressure (mmHg)

Rise from rest = peak RPP − resting RPP

Peak ÷ resting = peak RPP ÷ resting RPP

Enter 0 for the peak values to skip the exercise results.

The principle

The heart's oxygen use rises with how often it beats and how hard it has to push against arterial pressure. Multiplying the two captures both. Studies culminating in Gobel and colleagues (1978) showed that RPP tracks measured myocardial oxygen consumption during exercise. In cardiac rehabilitation and exercise testing, the RPP at which angina or ECG changes appear marks a person's ischaemic threshold, and training lowers the RPP needed for the same workload.

Worked example

Default inputs: resting 72 bpm and 124 mmHg; peak 150 bpm and 175 mmHg.

Resting RPP = 72 × 124 = 8,928.
Peak RPP = 150 × 175 = 26,250.
Rise = 26,250 − 8,928 = 17,322.
Peak ÷ resting = 26,250 ÷ 8,928 = 2.94.

Each point is the calculator re-run with only “Resting heart rate (bpm)” changed; the gold point is the default example. Change the inputs above and this chart follows your numbers.

Resting heart rate (bpm)	Resting rate pressure product
18	2,232
36	4,464
54	6,696
72	8,928
90	11,160
108	13,392
144	17,856

How to read the result

Published cut-offs vary between studies, and there is no single agreed normal range, so the page does not label the numbers. A lower resting RPP after training suggests the heart works more efficiently. During supervised exercise testing, the RPP reached and any symptoms at that level are interpreted by the clinical team.

Common mistakes

Using diastolic instead of systolic pressure.
Comparing RPP values measured with different methods or in different positions.
Using RPP alone to judge heart disease.

Keep in mind: This is a calculation aid, not a diagnosis. Exercise testing and cardiac rehabilitation should be supervised by qualified staff.

Frequently asked questions

Why is RPP called the double product?

Because it is the product of two measurements, heart rate and systolic pressure.

Does fitness change RPP?

Yes. Training usually lowers resting heart rate and the RPP for a given workload.

Is RPP the same as cardiac output?

No. Cardiac output is blood flow; RPP reflects the heart's oxygen demand.

Sources: Gobel FL, Norstrom LA, Nelson RR, Jorgensen CR, Wang Y, "The rate-pressure product as an index of myocardial oxygen consumption during exercise in patients with angina pectoris", Circulation 1978;57(3):549–556

Checked 9 Nov 2026. Sarvasti D, “Rate pressure product: the key index for cardiovascular health management”, Bali Med J 2025;14(1):319–326 (review: RPP = HR × SBP; history from Gerola 1957 and Gobel 1978; reported thresholds and their lack of consensus).

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