About MyCdA

MyCdA uses data from a power meter, speed sensor and cycling computer to estimate your drag area (CdA) and rolling resistance (Crr). Compare runs to find out whether a change in position or equipment is worth it.

A rule of thumb for race day: reducing CdA by 0.005 m² is worth about 5 W, or roughly 20 seconds over 40 km.

MyCdA is free software, with no ads and no subscription.

• The virtual elevation method follows the algorithm described by R. Chung in Estimating CdA with a power meter.
• Weather and elevation data: Open-Meteo. Maps: © OpenStreetMap contributors.
• Developer: marius@popovici.net
• Version 2.0.0

Have a question? Read the FAQ or join the user community.