Enter the running speed (mph) and the heart rate (BPM) into the calculator to determine the Running Efficiency.

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## Running Efficiency Formula

The following formula is used to calculate the Running Efficiency.

**Er = S / HR**

- Where Er is the Running Efficiency (mph/BPM)
- S is the running speed (mph)
- HR is the heart rate (BPM)

## How to Calculate Running Efficiency?

The following two example problems outline how to calculate the Running Efficiency.

**Example Problem #1:**

- First, determine the running speed (mph). In this example, the running speed (mph) is given as 3.85.
- Next, determine the heart rate (BPM). For this problem, the heart rate (BPM) is given as 150.
- Finally, calculate the Running Efficiency using the equation above:

Er = S / HR

Inserting the values from above and solving the equation:

Er = 3.85 / 150 = .0256 (mph/BPM)

**Example Problem #2: **

Using the same process as above, first define the variables required by the formula. In this case, these values are:

running speed (mph) = 3.45

heart rate (BPM) = 145

Entering these values yields:

Er = 3.45 /145 = .0237 (mph/BPM)