Half Marathon Pace Calculator
Turn a half marathon target into a pace per kilometre and per mile, and the time to be on at each split.
Share sends a link that reopens these numbers. Copy details pastes the full breakdown as a list.
The formula
pace = target time ÷ 21.0975 km
The splits assume an even pace from start to finish. Each one is the elapsed time to be on when you pass that point.
What to watch out for
Half marathon pace should feel comfortably hard for the first 10 km and properly hard after 16 km. Run the first few kilometres at target pace or a touch slower, and save any surge for the last 5 km.
If you will be out for more than about 90 minutes, take some carbohydrate on the way, such as a gel around 45 minutes and another around 75 to 90, with water. Practise it on long runs first. Slow your target by a few seconds per km on a hilly course or a warm day.
Frequently Asked Questions
What pace do I need for a 2-hour half marathon?
5:41 per km, or 9:09 per mile.
What is the halfway time for a 2-hour half?
1:00:00 at an even pace, at 10.55 km.
Do I need gels for a half marathon?
Under about 90 minutes, most runners do not. Beyond that, 30–60 g of carbohydrate an hour helps, as long as you have tried it in training.