Kilometre split calculator

Even pacing usually gives the fastest time. Put in the distance and goal time and get the clock time to see at every kilometre or mile marker.

Your details

Splits for 50:00

5:00

every kilometre at even pace

Km 15:00
Km 210:00
Km 315:00
Km 420:00
Km 525:00
Km 630:00
Km 735:00
Km 840:00
Km 945:00
Km 1050:00
Halfway25:00
Clock timesadd a start time to see the time of day at each split, handy for supporters

Write a few of these on your hand or set a lap alert. Hills move individual splits, so check the running total rather than every lap.

The working

Equal slices of your target

50 minutes over 10 km is 5:00 a kilometre, so the clock should read 5:00 at 1 km, 25:00 at 5 km and 50:00 at the finish. Marathons are shown every 5 km to keep the list short.

Using splits

On the day

Check the running total, not each lap: one hilly kilometre is fine
Lap alerts on a watch can drift from course markers; trust the markers
If you are 20 seconds down at halfway, do not sprint it back
Write three or four key splits on your hand

Popular 10K splits

For reference

10K time	Each km	At 5 km
1:00:00	6:00	30:00
55:00	5:30	27:30
50:00	5:00	25:00
45:00	4:30	22:30

Steady start and clock times

Two options for race day

First split slower by: many people start too fast in the crowd. Give the first split up to 30 seconds and the calculator spreads the time back over the rest, so your finish time does not change. For 10K in 50 minutes with a 20 second slower first kilometre, km 1 is 5:20 and the other nine are about 4:58.
Race starts at: pick the start time to see the time of day at each split. Share it with supporters so they know when to be at the 5K mark.
A halfway row is added in either case, because halfway is where most people check whether the plan is holding.

Read with care

What this cannot tell you

Course profileHills mean uneven splits for even effort.
CrowdsThe first kilometre is often slow; let it be.
GPS driftWatches usually measure a little long.

Questions

Common questions

What are splits in running?

The time for each section, or the running total at each marker.

Should I run even splits?

For most people even or a tiny negative split is fastest.

What is a 5 minute kilometre in miles?

About 8:03 per mile.

Sources

Last checked 21 October 2026. Spotted something wrong? Tell us and we will fix it.

Before you push on

New to exercise, or got a heart, lung or joint condition? Have a word with your GP or practice nurse first. Stop and get help if you feel chest pain, faintness or unusual breathlessness, and call 999 if it is severe.