Half Marathon Split Calculator
Enter your target half marathon time and get mile-by-mile splits with your choice of pacing strategy. Even, negative, or positive splits with checkpoint times and an on-pace tracker.
Calculate Your Splits
Enter your target finish time and choose a pacing strategy
Avg Pace/Mile
9:09
Avg Pace/Km
5:41
Strategy
even
Key Checkpoint Times
5K
28:26
Mile 3.1
10K
56:53
Mile 6.2
10 Miles
1:31:32
Mile 10.0
20K
1:53:45
Mile 12.4
Am I On Pace?
Enter your actual time at a checkpoint to see if you are ahead or behind your target pace. This tool accounts for your target finish time entered above.
Common Half Marathon Target Splits
Reference table showing mile-by-mile splits for the most popular half marathon goal times, using even pacing. Print this page or screenshot the table for quick race day reference.
About This Half Marathon Split Calculator
This is a free half marathon split calculator designed specifically for the 13.1 mile distance. Unlike generic split calculators, this tool is tailored to half marathon racing with features like pacing strategy selection (even, negative, or positive splits), key checkpoint times at 5K, 10K, 10 miles, and 20K, and an on-pace tracker that tells you whether you are ahead or behind at any checkpoint.
The calculator supports both mile and kilometer splits and includes a pre-calculated reference table for common goal times (1:30, 1:45, 2:00, 2:15, 2:30). Published by Motera, a gamified running app for iOS.
Train Smarter, Race Faster
Preparing for a half marathon means weeks of building fitness. Motera makes every training run count by turning it into a territory capture game. Run loops to claim zones, explore new routes through Fog of War, and track your progress on the leaderboard.
Your easy runs and long runs become strategic missions. By race day, you will have built fitness and explored your entire city.
MoteraFrequently Asked Questions
What is a good half marathon split strategy?
The best strategy for most runners is even splits or slight negative splits. Even splits mean running every mile at the same pace. Negative splits mean running the second half 5 to 15 seconds per mile faster than the first half. Starting conservatively and finishing strong almost always produces a better time than going out fast and slowing down.
How do I calculate my half marathon splits?
Divide your target finish time by 13.1 to get your average pace per mile. For even splits, each mile should take that same amount of time. For negative splits, add 5 to 10 seconds to your average for the first half and subtract the same from the second half. The calculator on this page does all of this automatically.
What are the key checkpoints in a half marathon?
The most useful checkpoints are 5K (mile 3.1), 10K (mile 6.2), 10 miles, and 20K (mile 12.4). Most races have clocks at these distances. Knowing your expected cumulative time at each checkpoint helps you stay on pace without constantly checking your watch.
What is a negative split in a half marathon?
A negative split means your second half is faster than your first half. In a half marathon, this usually means running the first 6 to 7 miles about 5 to 15 seconds per mile slower than goal pace, then gradually picking up to goal pace or faster for the remaining miles. It requires discipline early on but usually produces a faster overall time and a much better race experience.
How do I know if I am on pace during a half marathon?
Check your cumulative time at mile markers against your pre-calculated splits. If you are within 10 to 15 seconds of your planned cumulative time, you are on pace. Being more than 30 seconds ahead in the first 5 miles usually means you are going too fast. Use the "Am I on pace?" tool on this page to check at any checkpoint.
Should I use mile splits or km splits for a half marathon?
Use whatever your race course marks. In the US, most half marathons mark miles. In Europe and Australia, most mark kilometers. If you train in miles, use mile splits. If the race marks km but you think in miles, write down both and check whichever markers appear first.
What half marathon split times do I need for a 2 hour finish?
A 2:00:00 half marathon requires an average pace of 9:09 per mile. With even splits, every mile should be about 9:09. The cumulative time at mile 5 would be 45:47, at mile 10 would be 1:31:34, and the finish at 13.1 miles would be 2:00:00. The pre-calculated table on this page shows these splits for many common goal times.
What happens if I go out too fast in a half marathon?
Going out too fast in a half marathon (positive splitting) causes premature fatigue, usually hitting between miles 9 and 11. Your pace per mile can slow by 30 to 60 seconds or more in the final miles. A 5 second per mile gain in the first half often costs 15 to 20 seconds per mile in the second half. Starting conservatively is almost always faster overall.
