Half Marathon Pace Calculator
Use this half marathon pace calculator to turn a goal finish time into pace per kilometer and mile. The official half marathon distance is 21.0975 km, and the result also shows speed and the halfway checkpoint for an even race.
Results update as you enter valid values.
Your inputs
Enter a distance and a time to see your pace.
Uses your current distance and target time.
These results calculate a pacing scenario from your inputs. They do not predict your fitness or guarantee that a target is achievable.
How half marathon pace works
Half marathon pace is the total finish time divided by 21.0975 kilometers or 13.1094 miles. A 2:00:00 half marathon is 5:41 per kilometer and about 9:09 per mile. A 1:45:00 half marathon is 4:59 per kilometer and about 8:01 per mile. These are useful reference numbers because the half marathon is often used as a stepping stone to a full marathon.
The result is an average pace, not a guarantee that every kilometer will feel the same. A congested start, a hilly section, wind, or a manual stop can change the watch display while the goal time remains fixed. Use the pace as a target band and review the halfway and 10K checkpoints during the race.
Half marathon pace chart
| Goal time | Pace / km | Pace / mile | Halfway |
|---|---|---|---|
| 1:30:00 half marathon | 4:16 /km | 6:52 /mi | 45:00 |
| 1:45:00 half marathon | 4:59 /km | 8:01 /mi | 52:30 |
| 2:00:00 half marathon | 5:41 /km | 9:09 /mi | 1:00:00 |
| 2:15:00 half marathon | 6:24 /km | 10:18 /mi | 1:07:30 |
| 2:30:00 half marathon | 7:07 /km | 11:27 /mi | 1:15:00 |
These rows show average pace for the official distance. For an intermediate time or a custom race distance, use the calculator above.
How to use the half marathon pace calculator
Enter your target finish time. The distance is already set to 21.0975 km, so there is no need to enter a distance manually. If you have a goal time in mind, compare it with the table below to see the pace per kilometer, pace per mile, and speed. A 1:30 half requires 4:16 per kilometer or 6:51 per mile; a 2:30 half requires 7:07 per kilometer or 11:27 per mile.
Switch the pace unit if your training plan uses miles, then use the split planner for a longer checkpoint table. The display keeps the underlying calculation exact even when the text you see is rounded to the nearest second.
What is a good half marathon pace?
A good half marathon pace is one you can sustain for the full 21.0975 km without a large slowdown in the final 5K. Training history, recent race times, and the course matter more than a generic pace chart. A pace that feels comfortable for 5K can be far too aggressive for a half, especially in warm conditions.
Many recreational runners use a recent 10K or a sustained long-run effort as a starting point. If your goal requires a pace much faster than your recent race results, treat the calculated pace as an aspirational target and adjust the plan rather than forcing it on race day.
Half marathon race-day pacing
The first 5K often feels easier than the target because of race excitement. Use the calculated average pace as a ceiling, not a pace to beat in the opening kilometers. Passing halfway close to the planned split gives you a better chance of holding the pace to the finish.
For a negative split, keep the first half slightly controlled and make the second half a few seconds per kilometer faster. For a positive split, start slightly faster but understand that the final 5K may become harder. The calculator can model either scenario through the split planner without changing the total target time.
Half marathon pace in km and miles
The half marathon is 21.0975 km or 13.1094 miles, so a pace in minutes per mile is always numerically larger than the same pace in minutes per kilometer. Unit errors are one of the most common reasons a race plan feels wrong, so check both displays before you start.
If you use a treadmill, keep the incline and calibration in mind when comparing the speed shown on the machine with outdoor race pace. The calculator can convert the target to km/h or mph, but it cannot reproduce wind, terrain, or the cost of accelerating after a stop.
Frequently asked questions
What pace is a 2-hour half marathon?
A 2:00:00 half marathon is 5:41 per kilometer or about 9:09 per mile. Your even-effort halfway split is 1:00:00.
What pace is a 1:45 half marathon?
A 1:45:00 half marathon is 4:59 per kilometer or about 8:01 per mile. The halfway split is 52:30.
How far is a half marathon?
A half marathon is 21.0975 kilometers, or 13.1094 miles. The calculator uses the official distance.
Should I start faster than half marathon pace?
A small early buffer can feel tempting, but a large positive split is difficult to recover from. Starting near the target average and reassessing after 5K or 10K is usually easier to control.
Can I use this for a 10-mile race?
This page is fixed to the half marathon distance. Use the main pace calculator or a 10-mile split plan if your race is a different distance.
What is the 10K checkpoint for a half marathon?
For an even race, the 10K checkpoint is not exactly halfway, so use a split table rather than assuming the 10K time is half the finish time.
Does the calculator account for a hill or wind?
No. It calculates pace from distance and time. Hills, wind, heat, fueling, and course congestion can change the effort required for the same pace.
Can I print a half marathon plan?
Yes. Calculate the pace, open the split planner, choose your interval, and print the checkpoint table for race day.