You select a mode — solve for speed, time, or distance — then enter the two known values. The tool applies the basic formula Speed = Distance ÷ Time (with appropriate unit conversions) to compute the missing value. It also calculates your per-mile or per-kilometer split and, when solving for speed, projects finish times for common cycling distances by dividing each target distance by your average speed.
For recreational riders on flat terrain, 12–16 mph is typical. Regular fitness cyclists often average 16–20 mph. Competitive amateur racers may sustain 20–25 mph in group rides. Wind, hills, and bike type significantly affect these numbers.
The predictions assume you maintain a constant pace, which becomes less realistic over longer distances. Fatigue, nutrition, and terrain changes mean your actual time for a century ride will generally be 10–20% slower than a simple pace projection.
Use whichever unit your cycling computer or ride app displays. In the U.S., miles are standard; most of the rest of the world uses kilometers. The calculator handles conversions for the predicted distances automatically.
Different planning questions need different inputs. You might know your distance and time (from a completed ride) and want speed, or know your target pace and distance and need to estimate finish time. Three modes cover all common scenarios.
Estimate only. Results reflect your inputs and standard formulas. Double-check important decisions independently.