CALCULATOR

Split Calculator

Choose a distance, target time or average pace, and race strategy — Even Pace or Negative Split. See every split from 5K to marathon or a custom distance, at 1 km, 5 km or your own interval.

Race Distance
Target
Finish Time
HoursHR
MinutesMin
SecondsSec
Split Every
Pacing Strategy
Finish Time1:00:00

10K · Even Pace

Average Pace6:00 /km
First Half0:30:00
Second Half0:30:00
SplitDistance (cumulative)Pace /kmSplit TimeCumulative
11 km6:0006:000:06:00
22 km6:0006:000:12:00
33 km6:0006:000:18:00
44 km6:0006:000:24:00
55 km6:0006:000:30:00
66 km6:0006:000:36:00
77 km6:0006:000:42:00
88 km6:0006:000:48:00
99 km6:0006:000:54:00
1010 km6:0006:001:00:00
How to use it

How to use it

Choose a distance, target time or pace, and the distance between splits. For example, 10K in 40:00 with 1 km splits. With Even Pace, every kilometre is 4:00. With a Moderate Negative Split of 4%, you start at about 4:05/km and finish at about 3:55/km. You can edit each split’s pace individually. The total time updates automatically, showing the difference from your target.

Limits

What you need to know

This calculator performs a mathematical calculation, not a race prediction. Gradients, wind, heat and aid stations often require adjustments on race day. For these conditions, see GAP, the Wind Pace Calculator and the Heat Pace Calculator. If the distance does not divide evenly, the final split covers the remainder: for example, marathon splits every 5 km leave a final split of 2.195 km.

Related article

Read the related article

Race Strategy

Negative splits: when they work and how to plan your splits

A negative split means completing the second half of your race faster than the first. It is not always the fastest strategy, though. Learn when it helps, how it varies by distance and how to use the Split Calculator effectively.

7 min read
  • negative split
  • pacing strategy
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Next step

Pacing is more than numbers.

Experienced runners adapt their split table to the course and race-day conditions. Together, we will build the plan for your next race.

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Method

Methodology & Sources

Even Pace: the same pace in every segment. Negative Split: a linear change from split to split. With Moderate Progression at 4%, the first split starts about 2% slower and the last finishes about 2% faster than the average pace. The 4% describes the total change from first to last split, not the difference between the first and second halves. Normalisation: times are scaled at the end so their sum exactly matches the target time. Display is rounded to the nearest second.

Last updated: 20 June 2026