Running pace tells you how long each mile or kilometer takes. It is the number most runners use to plan training, judge effort and set race goals. This calculator converts any distance and finish time into pace per mile, pace per kilometer and speed, then shows even splits and race times at the same pace.
Enter a distance, choose miles or kilometers, and type your time as hours, minutes and seconds. The results update as you type.
How to Use the Running Pace Calculator
- Enter the distance you ran, for example 3.1 for a 5K in miles.
- Choose the unit, miles or kilometers.
- Type your finish time as h:mm:ss (1:05:20) or mm:ss (27:30).
You get your pace in both units, your average speed, cumulative splits for each whole mile or kilometer, and how long common race distances would take at that pace.
How Running Pace Is Calculated
Pace and speed are two views of the same thing.
| Result | Formula |
|---|---|
| Pace per mile | Time ÷ distance in miles |
| Pace per kilometer | Pace per mile ÷ 1.609 |
| Speed (mph) | 60 ÷ pace in minutes per mile |
| Time for another distance | Pace × that distance |
The calculator converts your time to minutes, divides by distance and formats the result back into minutes and seconds.
A Worked Example
A runner who finishes 3.1 miles in 27:30 has run at 8 minutes 52 seconds per mile. That equals about 5:31 per kilometer and 6.76 mph. At the same pace, a 10K would take about 55:07.
Pace vs Predicted Race Times
The race times this calculator shows are simple arithmetic: your current pace multiplied by the race distance. They are not predictions. Most runners slow down as distance increases, so a pace you hold for a 5K is unlikely to last a full marathon without specific training.
Use the race rows as a reference point. If your goal is a half marathon, the useful question is how much slower than your 5K pace you can comfortably sustain for longer.
Using Pace in Training
Pace is most useful when it reflects effort. Easy runs are typically run at a relaxed, conversational pace, while workouts include shorter efforts at faster paces. Pairing pace with heart rate can help you keep easy days easy. The Heart Rate Zone Calculator gives estimated zones you can use alongside your pace.
Some practical tips:
- Expect variation. Heat, hills, wind and fatigue all slow pace at the same effort.
- Check your distance. GPS watches can misjudge distance, especially near tall buildings and trees, which changes calculated pace.
- Use even splits as a guide. The split cards show the time you would reach each mile marker at a perfectly even pace, which is useful for race planning.
Converting Between Miles and Kilometers
One mile equals 1.609344 kilometers. To convert a pace per mile to pace per kilometer, divide by 1.609. To go the other way, multiply. For example, a 10:00 per mile pace is about 6:13 per kilometer, and a 5:00 per kilometer pace is about 8:03 per mile.
The calculator handles both directions, so you can enter a race measured in kilometers and still see your pace per mile.
Walking and Running
Walking and running use the same pace maths. If you walk a mile in 20 minutes, your pace is 20:00 per mile, or 3 mph. For walking-specific energy estimates, the Walking Calories Burned Calculator uses walking speed and incline. The CDC says adults need 150 minutes of moderate-intensity activity a week, or 75 minutes of vigorous activity, or an equivalent mix, and running at most paces counts toward the vigorous side.
FAQs
How do I calculate my running pace?
Divide your total time by the distance. If you run 3 miles in 30 minutes, your pace is 10:00 per mile. For kilometers, divide the time by the distance in kilometers. The calculator handles the conversion and formats the answer in minutes and seconds.
What is a good running pace?
There is no single good pace. It depends on age, experience, training, terrain and the purpose of the run. Easy runs should feel comfortable enough to talk, while race pace is faster. Comparing your own pace over time is more useful than comparing with other runners.
Are the race times on this page predictions?
No. They show how long each race would take if you held your current pace exactly. Most runners slow over longer distances, so a marathon run at 5K pace is unrealistic without long-distance training. Treat the rows as reference points, not forecasts.
What time format should I use?
Type your time as h:mm:ss for runs over an hour, such as 1:05:20, or mm:ss for shorter runs, such as 27:30. The calculator also accepts plain minutes. It shows an inline message if the format is not recognized.
Does the calculator store my times?
No. It runs in your browser only. Your distances and times are not saved, not sent to analytics and not shared, and refreshing the page clears them.
Sources
- CDC, Adult Activity: An Overview. Weekly moderate and vigorous activity guideline.