Goal time
Sub-50-minute 10K pace
Fifty minutes for 10K is five minutes a kilometer, exactly — the same pace as a twenty-five-minute 5K, held for twice the distance. It is the most popular target at the distance for good reason.
The pace this target demands
- Finish time
- 50:00
- Per mile
- 8:03
- Per kilometer
- 5:00
- Speed
- 7.5 mph
The time to actually aim at
50:00 is a ceiling, not a target. Plan for 49:40 instead and you get 8:00 per mile, which buys back the seconds a long tangent, a crowded water station or a slow first quarter-mile will cost you.
The paces on this page are shown to the nearest second, which is how a watch shows them. Typing a rounded pace back into a calculator will not return the exact target time, and no amount of decimal places fixes that on a real course.
The pace is clean, the arithmetic is trivial, and the difficulty is entirely in the second half. Runners who have already broken twenty-five minutes for 5K arrive here with the speed and without the endurance, and the sixth, seventh and eighth kilometers are where that shows up.
Splits every 1 mi
An even effort from start to finish. Cumulative time is the clock reading as you pass each marker.
Ten identical kilometer splits on an even plan. Write down the five-kilometer cumulative time and check that one rather than every marker.
Scroll the table sideways on a narrow screen.
Splits every 1 mi
| Split | Distance | Split time | Cumulative | Pace |
|---|---|---|---|---|
| 1 | 1.00 | 8:03 | 8:03 | 8:03 |
| 2 | 2.00 | 8:03 | 16:06 | 8:03 |
| 3 | 3.00 | 8:03 | 24:08 | 8:03 |
| 4 | 4.00 | 8:03 | 32:11 | 8:03 |
| 5 | 5.00 | 8:03 | 40:14 | 8:03 |
| 6 | 6.00 | 8:03 | 48:17 | 8:03 |
| 7 | 6.21 | 1:43 | 50:00 | 8:03 |
Splits every 1 km
| Split | Distance | Split time | Cumulative | Pace |
|---|---|---|---|---|
| 1 | 1.00 | 5:00 | 5:00 | 5:00 |
| 2 | 2.00 | 5:00 | 10:00 | 5:00 |
| 3 | 3.00 | 5:00 | 15:00 | 5:00 |
| 4 | 4.00 | 5:00 | 20:00 | 5:00 |
| 5 | 5.00 | 5:00 | 25:00 | 5:00 |
| 6 | 6.00 | 5:00 | 30:00 | 5:00 |
| 7 | 7.00 | 5:00 | 35:00 | 5:00 |
| 8 | 8.00 | 5:00 | 40:00 | 5:00 |
| 9 | 9.00 | 5:00 | 45:00 | 5:00 |
| 10 | 10.00 | 5:00 | 50:00 | 5:00 |
Three ways to spend the same time
The finish time is identical in all three. What changes is where the effort goes, and how the opening miles feel.
Scroll the table sideways on a narrow screen.
| Strategy | Opens at | Closes at | First half | Second half | Second half vs first |
|---|---|---|---|---|---|
| Even splits | 8:03 | 8:03 | 25:00 | 25:00 | Level |
| Negative splits | 8:11 | 7:52 | 25:15 | 24:45 | 0:31 faster |
| Positive splits | 7:54 | 8:14 | 24:44 | 25:16 | 0:31 slower |
Even splits
The same pace for every split. It is the plan that needs the least judgment and the one every other plan is measured against, and for a first attempt at a barrier it is usually the right answer.
Negative splits
Set here at 2 percent, which means the opening pace is 2 percent slower than even and the closing pace is 2 percent faster — a spread of 4 percent from the first split to the last. On the clock that is 8:11 out of the gate and 7:52 coming home. It costs discipline early and gives back a second half 0:31 quicker.
Positive splits
The mirror image, and the one that happens by accident more often than by choice. The same 4 percent spread, run the other way round: 7:54 early, 8:14 late. It is a real plan for a course that climbs at the end, and a warning sign everywhere else.
The percentage is the swing at each end, not the difference between the halves. Doubling it gives the spread from the first split to the last.
This is a good target on which to practice a negative split, because the pace is far enough inside most runners' limit that starting deliberately slow does not put the goal at risk.
Clock time at every marker
An even effort, at the points a race actually marks. Worth writing on a wristband.
| Point | Elapsed | Remaining |
|---|---|---|
| 1 km | 5:00 | 45:00 |
| 1 mi | 8:03 | 41:57 |
| 2 km | 10:00 | 40:00 |
| 4 km | 20:00 | 30:00 |
| Halfway | 25:00 | 25:00 |
| 4 mi | 32:11 | 17:49 |
| 8 km | 40:00 | 10:00 |
| 6 mi | 48:17 | 1:43 |
| Finish | 50:00 | 0:00 |
What being off pace costs
Every row starts from the exact required pace and shifts it. This is the table to look at when the first mile comes up quick.
Per mile
| Off pace by | Pace | Finish time | Vs target |
|---|---|---|---|
| 15 s faster | 7:48 | 48:27 | 1:33 inside |
| 10 s faster | 7:53 | 48:58 | 1:02 inside |
| 5 s faster | 7:58 | 49:29 | 0:31 inside |
| Exactly on pace | 8:03 | 50:00 | On the line |
| 5 s slower | 8:08 | 50:31 | 0:31 over |
| 10 s slower | 8:13 | 51:02 | 1:02 over |
| 15 s slower | 8:18 | 51:33 | 1:33 over |
Per kilometer
| Off pace by | Pace | Finish time | Vs target |
|---|---|---|---|
| 15 s faster | 4:45 | 47:30 | 2:30 inside |
| 10 s faster | 4:50 | 48:20 | 1:40 inside |
| 5 s faster | 4:55 | 49:10 | 0:50 inside |
| Exactly on pace | 5:00 | 50:00 | On the line |
| 5 s slower | 5:05 | 50:50 | 0:50 over |
| 10 s slower | 5:10 | 51:40 | 1:40 over |
| 15 s slower | 5:15 | 52:30 | 2:30 over |
The middle row is the definition of the target rather than a way to hit it. Finishing at exactly 50:00 does not beat 50:00, which is the whole reason the aim-for time above exists.
Twenty seconds of margin is the buffer built into the aim-for time above. Five seconds a mile eats most of it.
The targets either side
Every other pace for this distance
The full lookup table for the 10K, from a pace almost nobody holds down to a comfortable one, with finish times for all of them.
A distance that is not on this list?
The web calculator takes any distance, any time and any pace, and works out the rest as you type. Nothing to install, nothing to sign up for.
The app
Take the numbers to the start line
Simple Pace Calculator is a free app for iPhone & iPad. Distance, time, pace and speed stay in sync while you edit any one of them, and a lock shows which value is being held fixed. All calculations work offline.
$2.99 (US), one-time unlocks two extra tools, once, with no subscription: Splits, for even, negative or positive pacing at any interval, and ETA, for working out when a runner reaches your spot on the course.
For this distance the app offers splits every 400 m, 1 km, 1 mi, 1/2, plus a custom interval of your own.
Everything on this page stays free on the web, whether or not you ever install anything.
