Enter the R-R interval into the calculator to determine the heart rate. This calculator can also evaluate any of the variables given the others are known.

## R-R Interval Heart Rate Formula

The following formula is used to calculate the heart rate from the R-R interval.

HR = 60 / RRI

Variables:

- HR is the heart rate (beats per minute) RRI is the R-R interval (seconds)

To calculate the heart rate, divide 60 by the R-R interval. The result is the heart rate in beats per minute.

## What is an R-R Interval Heart Rate?

The R-R interval heart rate refers to the time period between successive R waves in the QRS complex of the heart’s electrical cycle, as measured on an electrocardiogram (ECG). It is essentially the time between heartbeats and is usually measured in milliseconds. Variations in the R-R interval are used to calculate heart rate variability, which can provide important information about the functioning of the autonomic nervous system and overall cardiovascular health.

## How to Calculate R-R Interval Heart Rate?

The following steps outline how to calculate the R-R Interval Heart Rate.

- First, determine the R-R interval (RRI) in seconds.
- Next, use the formula HR = 60 / RRI to calculate the heart rate (HR) in beats per minute.
- Finally, calculate the R-R Interval Heart Rate.
- After inserting the RRI value and calculating the result, check your answer with the calculator above.

**Example Problem:**

Use the following variables as an example problem to test your knowledge.

R-R interval (RRI) = 0.8 seconds