Running Pace Calculator
Convert between distance, time and pace — and see your splits and finish predictions.
How it works
pace = total time ÷ distance
Pace is simply time over distance, shown per mile and per kilometer. Splits assume perfectly even pacing — in practice most runners aim for level or slightly negative splits (second half no slower than the first).
Worked example
A 28:30 5K is 28.5 ÷ 3.107 = 9:10 per mile, or 5:42 per kilometer — about 6.5 mph.
Frequently asked questions
What’s a good 5K time?
Finishing at all beats not starting. Casual adult runners commonly land 25–40 minutes; a sub-25 5K is a solid recreational benchmark, sub-20 is competitive club level.
How do I predict a marathon from a 5K?
Rules like Riegel’s (time × (distance ratio)^1.06) give rough predictions, but marathons demand specific endurance training — treat predictions as ceilings, not promises.
Should I run even splits?
For races, even or slightly negative splits produce the best times for most runners. Going out fast almost always costs more later than it gains early.
Related calculators
This calculator is for educational purposes. Double-check important results before acting on them.