Running pace calculator — pace, time & splits.

Running pace is total time divided by distance. Run 10 km in 50 minutes and your pace is 50 ÷ 10 = 5 minutes per kilometre. This calculator solves any of the three values — pace, time, or distance — from the other two, and converts between minutes per kilometre and minutes per mile automatically.

A good pace depends on fitness and goal. Recreational runners often cruise easy miles at 6:00 to 7:00 per kilometre, while a sub-4-hour marathon needs roughly 5:41 per kilometre held for the full distance. Rather than chase one number, compare your easy, tempo, and race paces and let them rise together over a training block.

This calculator uses Pete Riegel's formula: predicted time equals your known time multiplied by (new distance ÷ old distance) raised to the power 1.06. A 25-minute 5K predicts a 10K near 51:57. The exponent 1.06 accounts for the fact that longer races are run at a slightly slower pace, so predictions are most reliable for well-trained runners across similar distances.

A 4-hour marathon requires an average pace of about 5:41 per kilometre, or 9:09 per mile, held across all 42.2 km. Enter a 4:00:00 goal time and the marathon distance and this calculator returns that exact pace, plus the per-kilometre splits so you can see the required consistency lap by lap.

One mile equals 1.609 kilometres, so a per-mile pace is faster in minutes than the same effort per kilometre. To convert min/km to min/mile, multiply by 1.609; to go the other way, divide by 1.609. This calculator does both instantly when you switch the pace unit, so your splits and race predictions update in the unit you race in.

Splits are the times for each segment of a run, usually each kilometre or mile. Even splits mean holding a steady pace throughout; negative splits mean running the second half faster than the first, a common strategy for a strong finish. The splits table on this page lists the cumulative time you should hit at each distance marker.