About the Cycling Speed Calculator

Average speed is distance divided by total time: 40 km in 2 hours is 20 km/h. Pace — the inverse — is the time per unit distance (minutes per km or mile), which most riders find easier to plan with on long rides.

Speed Realities

At 25 km/h, roughly 80% of a rider's power goes to overcoming air resistance, and the power requirement rises with the cube of speed — going 10% faster needs about 33% more power. That is why group riding and drafting matter so much on the flat.