Free Running Pace Calculator
Running Pace Calculator
Calculate your target running pace, total finish time, or race distance instantly. Perfect for 5K, 10K, Half Marathon, and Full Marathon training.
1 Choose What to Calculate
2 Set Race Distance
3 Enter Duration or Pace
08:02
min / mileFrequently Asked Questions (FAQs)
How does this calculator work?
This tool allows you to solve for any missing variable in your running math. Depending on which tab you select, you can:
- 1. Find your Pace: Enter your distance and total time to see how fast you need to run per kilometer or mile.
- 2. Find your Finish Time: Enter your distance and intended pace to see how long your run will take.
- 3. Find your Distance: Enter your total time and pace to see how far you will travel. Simply toggle between Metric or Imperial units, use the race presets for standard distances, and click calculate to see your results.
Can I switch between miles and kilometers?
Yes. You can toggle between Metric (km) and Imperial (mi) at any time. The calculator will automatically convert your distance and pace values for you, which is helpful if you are following a training plan in miles but racing on a course marked in kilometers.
Why should I use a pace calculator instead of just my watch?
While a watch is great during a run, this calculator is a planning tool. It helps you set realistic goals before you start, allows you to “what-if” different scenarios (like seeing how much time you save by running 5 seconds faster per km), and provides 100% mathematical accuracy that isn’t dependent on a GPS signal.
How do the race preset buttons work?
The buttons labeled 5K, 10K, HM, and FM are shortcuts for standard race distances. Clicking 5K or 10K loads those distances, while HM loads a Half Marathon (21.1km) and FM loads a Full Marathon (42.2km). This saves you from having to type out the exact race mileage manually.
How do I calculate my marathon pace?
Click the “Pace” tab at the top. Then, use the “FM” (Full Marathon) preset button to automatically set the distance. Finally, enter your goal finish time (e.g., 4:00:00) and click Calculate. The result will show the exact minutes per mile or kilometer you need to maintain.
What is the difference between speed and pace?
Speed is measured in distance per time (e.g., 10 km/h), while Pace is measured in time per distance (e.g., 6:00 min/km). Most runners use Pace because it makes it easier to track splits during a run.
Does this account for terrain or elevation?
No, this calculator assumes a constant speed on a flat surface. For hilly races, you should aim for a slightly faster average pace on flat sections to account for slower times on uphills.
Why does my GPS watch show a different pace than this calculator?
GPS watches often experience “signal drift” or “corner cutting,” meaning the distance they record isn’t 100% accurate. This calculator uses pure mathematics based on fixed distances, making it the “gold standard” for race day planning where the course distance is certified.
How do I convert my treadmill speed (km/h) to pace (min/km)?
Treadmills usually display speed. To find your pace, you can calculate the time it takes to run 1 km at that speed. For example, 12 km/h is a 5:00 min/km pace. Setting the distance to 10km and the time to 60 minutes in the Pace tab will help you visualize these conversions.
What pace should I run for my "easy" days?
Most coaches recommend that easy runs should be 60 to 90 seconds slower per kilometer (or 90 to 120 seconds slower per mile) than your current 5K race pace. Use our calculator to find your 5K pace, then add the extra time to find your target easy zone.
Can I use this for intervals?
Absolutely. Switch the unit to your preference and enter the specific distance of your interval (e.g., 0.4 km for a 400m track lap) to find your target lap time.
What is a "negative split," and should I plan for one?
A negative running split is when you run the second half of a race faster than the first. It is widely considered the most efficient way to race. You can use the calculator to determine your average goal pace, then aim to start 5 to 10 seconds slower than that and finish 5 to 10 seconds faster.