Pace Calculator
Running pace, distance, and time. For 5K through marathon.
Your pace
5:36 /km
Race time projections at this pace
5K
28:00
10K
56:00
Half
1:58:09
Marathon
3:56:18
A pace calculator connects the three numbers every runner juggles: pace, distance, and time. Give it any two and it finds the third.
Enter, for example, your target finish time and race distance to get the pace you need to hold, or your pace and distance to predict a finish. It works for 5K, 10K, half marathon, marathon, and any custom distance.
Knowing your pace turns a goal into a plan you can execute on race day, and it makes training splits and pacing strategy concrete instead of guesswork.
How this calculator works
Pace is time divided by distance, usually expressed as minutes per mile or minutes per kilometer. To find a finish time, the calculator multiplies your pace by the distance; to find a required pace, it divides your goal time by the distance. It handles unit conversions (miles to kilometers, minutes per mile to miles per hour) and can break a race into even splits so you can see the clock target at each mile or kilometer. Because pace, time, and distance are linked by one relationship, fixing any two always determines the third.
What affects the number
- The distance and your target time set the pace you must sustain; longer races demand a more conservative pace.
- Even versus negative splits affect strategy; many runners aim to run the second half as fast or faster.
- Terrain and elevation change effort at a given pace, so hilly courses run slower than flat ones.
- Heat, humidity, and altitude all slow sustainable pace compared with cool conditions.
- Fitness and training determine the pace you can hold without fading late in the race.
- Units matter; make sure you are comparing minutes per mile with miles or minutes per kilometer with kilometers.
Frequently asked questions
How do I calculate my running pace?
Divide your time by the distance. If you ran 3 miles in 27 minutes, your pace is 9 minutes per mile. This calculator does it instantly and can also convert between minutes per mile, minutes per kilometer, and miles per hour.
What pace do I need for a sub-4-hour marathon?
A four-hour marathon requires about 9 minutes 9 seconds per mile, or roughly 5 minutes 41 seconds per kilometer, held steadily for 26.2 miles. Enter your goal time and the marathon distance to see the exact pace and per-mile splits.
What are negative splits?
Running negative splits means completing the second half of a race faster than the first. It is a common strategy for a strong finish, since starting slightly conservative preserves energy for later miles when fatigue sets in.
How do I convert pace to speed?
Speed in miles per hour is 60 divided by your pace in minutes per mile. A 10-minute mile equals 6 miles per hour. The calculator handles the conversion both ways so you can plan on a treadmill or track your pace outdoors.
This calculator provides general estimates for educational purposes only and is not financial, medical, legal, or tax advice. Your actual results depend on your specific situation and current rates.