Cycling Bike Pace Calculator

This calculator uses the fundamental relationship between distance, speed, and time: Time = Distance ÷ Speed. It can solve for any of the three variables given the other two, and converts between km/h and mph, as well as pace per kilometer and pace per mile.

Optional course adjustments apply multipliers to account for terrain (rolling +3%, hilly +7%, mountainous +12%), wind (light headwind +4%, strong headwind +10%), and bike type (TT/tri bike −5%, gravel +6%, hybrid +10%). These are approximate estimates — actual course conditions vary significantly.

The what-if impact table shows how small speed changes (±1–3 km/h) affect total finish time. This is especially useful for triathlon pacing — riding 2 km/h faster can save significant time on the bike, but may cost much more on the run if it causes excessive fatigue.

In triathlon, the bike is often called the "most important leg to pace correctly." Riding too hard depletes glycogen stores and increases cardiac drift, directly compromising run performance. Many athletes who produce fast standalone bike splits finish slower overall due to a poor run.

A common recommendation is to ride at or below your target race power/effort, saving energy for the run. Negative splitting the bike (riding the second half slightly faster) is a proven strategy for long-course triathlon. Use this calculator to plan realistic splits, then practice them in training.