Aerodynamic Drafting Calculator

Calculate exactly how much energy you save by hiding in the slipstream.

Cycling Speed (mph)

Rider Weight (lbs)

Select Drafting Position

Solo Rider

0 Watts

Power Breakdown:

• Aero Drag • Rolling Res.

Drafting Position
0 Watts
Power Breakdown:

                • Aero Drag
                • Rolling Res.
              

You are saving 0 Watts (0%) by drafting!

The Physics of Drafting

In cycling, the vast majority of your energy goes toward pushing air out of the way. Aerodynamic drag increases with the square of your velocity. This means riding at 20 mph is significantly harder than riding at 15 mph.

Aerodynamic Drag (Blue Bar): Over 80% of a solo rider's effort is spent fighting air resistance. Drafting closely behind another rider reduces the high-pressure air hitting you, dropping your CdA (aerodynamic drag coefficient) by roughly 30%.
Rolling Resistance (Orange Bar): A smaller portion of energy is spent overcoming tire friction. This is purely weight-dependent and is not reduced by drafting.
The Peloton Effect: Hiding deep inside a pack of riders creates a massive slipstream. The riders in front punch a hole in the air, allowing you to cruise at 25+ mph using 40-50% less energy than if you were riding alone!