Half Marathon Pace Calculator
Enter a goal half marathon finish time to get your required pace, halfway split, and cumulative split targets.
How to use the half marathon pace calculator
- Enter your goal half marathon finish time (h:mm:ss).
- Click Calculate pace.
- Use the pace and splits to plan an even effort over 21.1 km.
Pacing the half marathon
The half is long enough that early overpacing costs you in the final 5 km. Aim to reach halfway on or just behind target, then hold or gently push to the finish.
Pacing the half marathon's middle miles
The half is long enough that early overpacing costs you, but short enough that you can push the final stretch if you have paced sensibly. The danger zone is kilometres 8-15, where the early adrenaline has faded but the finish still feels far away.
Hold your planned pace through that middle section even if it feels too easy, and you will have the reserves to lift the effort over the closing kilometres.
From goal time to a smart split plan
Reach halfway on or a couple of seconds behind goal pace, then aim to hold or gently push. A half marathon rewards discipline: the cost of going out 10 seconds per kilometre too fast is far greater than the benefit, because the final 5 km is where races are won or lost.
Frequently asked questions
What pace is a sub-2 hour half marathon?
A 2:00:00 half marathon needs about 5:41 per km (9:09 per mile) over the 21.0975 km distance.
What pace is a 1:45 half marathon?
A 1:45:00 half marathon requires roughly 4:59 per km (8:01 per mile).
What pace is a sub-2-hour half marathon?
About 5:41 per kilometre or 9:09 per mile over the 21.0975 km distance. The split table shows your target at each kilometre.
Should I take gels in a half marathon?
For efforts over about 90 minutes, one or two gels can help maintain pace late. Faster runners finishing well under 90 minutes often need little or no fuelling beyond a pre-race meal.
How should half marathon pace compare to my 10K pace?
Most runners race a half marathon roughly 15-20 seconds per kilometre slower than their 10K pace, depending on endurance. Use the race predictor for a personalised estimate.
Related tools
Marathon Pace Calculator
Enter a goal marathon finish time to get the pace you need to hold, your halfway target, and cumulative splits.
Pace Calculator
Enter any two of distance, time, and pace — get the third instantly, plus per-km and per-mile splits.
Negative Split Calculator
Plan a negative split by choosing how much faster to run the second half of your race.