Pace Calculator

How pace is calculated

Pace is your total time divided by distance, giving minutes and seconds per mile or kilometer. Speed is the same numbers flipped around — distance covered per hour. Handy for pacing a race, checking a training run, or estimating finish times for a given distance.

Using pace to plan a race

Once you know your pace per mile or kilometer from a training run, multiplying it out gives a realistic finish-time estimate for race day — a 9:00/mile training pace projects to roughly a 39-minute 5K or a 1:58 half marathon, assuming similar effort and conditions. Real race performance also depends on terrain, weather, and pacing strategy, so treat a straight multiplication as a starting estimate rather than a guarantee, especially over longer distances where pace tends to drift.

Even splits beat a fast start

Runners who go out faster than their target pace almost always slow down disproportionately in the back half, ending up slower overall than someone who ran a consistent, even pace throughout — the physiological cost of early over-effort compounds rather than balancing out. Elite marathoners typically aim for a slightly negative split (the second half marginally faster than the first) rather than starting fast and holding on; if a training pace feels sustainable in the first mile, that's a reasonable target pace to hold steady, not one to exceed early.

Mile pace and kilometer pace aren't a simple ratio

Because a mile is longer than a kilometer, a "9:00 per mile" pace does not simply become "9:00 per km" if you switch units — it converts to roughly 5:36 per km, since the same speed covers a kilometer in proportionally less time than a mile. Always double check which unit a quoted pace is using, especially when comparing a training plan written in one unit against a race measured in the other.

Pace for walking, not just running

The same distance-over-time math applies just as well to walking, and it's a genuinely useful way to plan a hike or a long walk with a real time budget — a brisk walking pace generally sits somewhere around 15-20 minutes per mile, several times slower than even a casual jogging pace, which matters when estimating how long a multi-mile trail will actually take. Plugging in a known walking speed against an unfamiliar trail's stated distance gives a far more realistic time estimate than guessing.