Convert watt losses: cr & cwA/CdA calculator

Rolling or aero losses are often given as a watt value at a specific speed—for example from tests, magazines, or manufacturer data. These two mini calculators help you derive the underlying coefficients: cr for tire rolling resistance and cwA/CdA for aerodynamic drag.

This is especially useful if you want to compare values across sources or use them in simulations/training planning: watts always depend on speed, whereas cr and cwA/CdA are (under the same test conditions) the more comparable metrics.

Next step with cr & cwA/CdA: In the Bike Calculator you can calculate the resulting speed (or the required watts). Open Bike Calculator