Enter any two of distance, time, and pace and we'll calculate the third. Switch between miles and kilometers, or tap a race preset to plan your next 5K, 10K, half, or marathon.
A running pace calculator helps you answer three questions: how fast you ran, how long a race will take at a given pace, and how far you can go in a set time. Fill in any two values and the calculator solves the third instantly.
Divide your total time by the distance you ran. For example, running 5 miles in 40 minutes is an 8:00 per-mile pace.
A sub-2:00 half marathon requires roughly a 9:09 per-mile pace, or about 5:41 per kilometer.
Toggle the unit switch at the top of the calculator. An 8:00 per-mile pace is about 4:58 per kilometer.