PORT CALCULATOR
Running Efficiency Index Calculator
Calculate your running efficiency index to optimize performance and endurance.
What is the Running Efficiency Index Calculator & How does it work?
The Running Efficiency Index (REI) is a metric that quantifies how efficiently you are using your heart rate during a run. It is calculated by dividing your speed by your heart rate, providing insights into the balance between pace and cardiovascular strain.
A higher REI indicates better efficiency, meaning you are maintaining a faster pace with less effort. This can be particularly useful for runners aiming to improve their performance without increasing their heart rate significantly.
REI = \frac{\text{Speed (m/s)}}{\text{Heart Rate (bpm)}}}
REI = Running Efficiency Index, Speed = your running speed in meters per second, HR = heart rate in beats per minute.
Parameters
Running Efficiency Index—
Results are for informational purposes only and do not constitute professional advice.