Data Cranker - data calculator tools for cyclists, runners, and other athletes

Data Cranker is a web-app with simple & easy-to-use calculators for cyclists and other athletes.

Cycling Power to Weight Ratio Calculator

Power to Weight Ratio (PWR) is a simple way to calculate and compare your cycling performance. It is calculated by dividing your weight by your average power output.

Cycling Power Zones Calculator

By simply inputting your functional threshold power, our calculator creates your power zones and also gives you a detailed description about each zone!

Heart Rate Training Zones Calculator

With just one input value, our calculator instantly creates your cycling and running heart rate training zones and gives you information about what these zones mean.

Bicycle Gear Ratio Calculator

How to calculate bicycle gear ratio? We'll calculate it for you and you can compare your gearing with our full bicycle gear ratio chart.