🏃 Race Pace Split Calculator

Enter your goal finish time and race distance to calculate your target pace and cumulative split times at each mile.

Goal Time (hh:mm:ss)

Distance (miles)

Goal time divided by distance

The pace is a single division, and each split is that pace multiplied by the mile number, so the table is cumulative clock time rather than lap time:

pace       = goal time / distance
split at n = pace × n

Forty minutes for 4 miles is 10:00 per mile, and the rows read 10:00, 20:00, 30:00, 40:00 - what the race clock should say as you pass each marker. For a 4-hour marathon, 240 minutes over 26.2 miles is 9:10 per mile, putting mile 13 at 1:59:05. Only whole miles get a row; a distance with a fraction adds one last line at the full goal time, so 26.2 gives miles 1 to 26 then a finish row.

Entering time and distance

The time box takes h:mm:ss or mm:ss. Typing 40:00 means forty minutes, not forty hours - two parts are read as minutes and seconds.
Distance is in miles. For metric races use 3.11 for a 5K, 6.21 for a 10K, 13.11 for a half and 26.22 for a marathon.
To convert the pace to kilometres, divide by 1.609. A 10:00 mile is 6:13 per km.

These are even splits, which almost nobody runs. Hills, wind, field congestion in the first mile and the drift that comes with fatigue all move real splits around by 10-20 seconds. Most runners finish faster off a slightly slow opening mile than off an even one, so treat the early rows as a ceiling.

Frequently asked questions

What pace do I need for a 4 hour marathon?

9:10 per mile, or about 5:41 per kilometre, held for the whole 26.2. Halfway should come up at roughly 2:00:00.

What is a negative split?

Running the second half of a race faster than the first. It is the pacing pattern behind most personal bests, because starting 2-3% under goal pace costs little and leaves something for the closing miles.

How do I work out pace from a finish time?

Convert the time to minutes, divide by the distance, then turn the decimal part back into seconds. 55 minutes for 6.21 miles is 8.856 minutes, and 0.856 of a minute is 51 seconds, so 8:51 per mile.