Running Pace Calculator – Find Your Pace, Speed & Race Time
Whether you are training for a 5K, 10K, half marathon, or full marathon, our running pace calculator helps you find your pace per mile, pace per km, and estimated finish time.
Running Pace Calculator
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Average Running Paces by Level
| Runner Level | Pace / Mile | 5K Time |
|---|---|---|
| Beginner | 12–15 min | 37–46 min |
| Intermediate | 9–12 min | 28–37 min |
| Advanced | 7–9 min | 22–28 min |
| Elite | Under 6 min | Under 18 min |
How to Calculate Running Pace
Pace is how long it takes you to cover one unit of distance, so it is always time divided by distance. Speed is the inverse: distance divided by time. Runners think in pace, cyclists think in speed, and the two describe exactly the same effort.
Speed = Distance / Total time
Worked example
You run 10 km in 52 minutes and 30 seconds.
- Convert the time to minutes: 52 + (30 / 60) = 52.5 minutes
- Pace: 52.5 / 10 = 5.25 minutes per km, which is 5:15 per km
- Speed: 10 / (52.5 / 60) = 11.4 km/h
The decimal is the part people get wrong. A pace of 5.25 minutes is 5 minutes 15 seconds, not 5 minutes 25 seconds. Multiply the decimal part by 60 to convert it into seconds.
Pace Chart for Common Race Distances
| Pace per km | 5K | 10K | Half marathon | Marathon |
|---|---|---|---|---|
| 4:00 | 20:00 | 40:00 | 1:24:24 | 2:48:48 |
| 4:30 | 22:30 | 45:00 | 1:34:57 | 3:09:54 |
| 5:00 | 25:00 | 50:00 | 1:45:30 | 3:31:00 |
| 5:30 | 27:30 | 55:00 | 1:56:03 | 3:52:06 |
| 6:00 | 30:00 | 1:00:00 | 2:06:36 | 4:13:12 |
| 7:00 | 35:00 | 1:10:00 | 2:27:42 | 4:55:24 |
These are straight-line conversions, holding the same pace for the whole distance. In reality almost nobody holds their 5K pace for a marathon, which is what race prediction is for.
Predicting a Race Time From a Shorter Result
The standard tool is Riegel's formula, published in 1977 and still the most widely used:
The 1.06 exponent is what accounts for slowing down over longer distances. If you run 10 km in 50 minutes, the predicted marathon time is 50 x (42.195 / 10) to the power 1.06, which is about 3 hours 51 minutes.
Two honest caveats. Riegel assumes you have trained appropriately for the longer distance, and it becomes optimistic past the half marathon, because the marathon is limited by fuelling and muscular endurance rather than pure aerobic fitness. Treat a Riegel marathon prediction as a ceiling, not a target.
Training Paces
Running every session at the same pace is the most common training error. Most well-structured plans are roughly 80 percent easy running and 20 percent hard.
| Session type | Relative to 10K race pace | How it should feel |
|---|---|---|
| Easy / recovery | 90 to 120 seconds per km slower | Full conversation possible |
| Long run | 60 to 90 seconds per km slower | Comfortable, short sentences |
| Tempo / threshold | 15 to 25 seconds per km slower | Comfortably hard, few words |
| Interval / VO2 max | 10 to 20 seconds per km faster | Hard, no talking |
Common Pace Mistakes
- Reading 5.25 as 5:25. A decimal pace of 5.25 minutes is 5:15. Multiply the decimal by 60.
- Running easy days too fast. This is the single most common reason runners plateau, because it leaves them too tired to run the hard sessions genuinely hard.
- Starting a race at goal pace on a downhill. Adrenaline plus gradient means the first kilometre is almost always too fast, and you pay for it later.
- Comparing treadmill pace to road pace. A treadmill removes wind resistance, so a 1 to 2 percent incline is often used to approximate outdoor effort.
Frequently Asked Questions
How do I calculate my running pace?
Divide your total time by the distance. For example, 52 minutes 30 seconds for 10 km is 52.5 / 10 = 5.25 minutes per km, which is a pace of 5:15 per km. Remember to convert the decimal: multiply the part after the decimal point by 60 to get seconds, so 5.25 minutes is 5 minutes 15 seconds and not 5 minutes 25 seconds.
What is the difference between pace and speed?
Pace is time divided by distance, expressed as minutes per kilometre or per mile. Speed is distance divided by time, expressed as km/h or mph. They describe the same effort from opposite directions: a pace of 5:15 per km is a speed of about 11.4 km/h. Lower pace numbers mean faster, higher speed numbers mean faster.
What is a good running pace for beginners?
For most beginners a comfortable pace is somewhere between 7:00 and 9:00 per km, and it should allow you to hold a conversation. Pace matters far less than consistency at this stage. Being able to run continuously for 30 minutes is a more useful early goal than hitting any particular pace.
What pace do I need for a sub-30 minute 5K?
You need to average 6:00 per km, or about 9:39 per mile. That works out to a speed of 10 km/h. A practical approach is to build until you can comfortably run 5 km, then add one weekly session of intervals at slightly faster than 6:00 per km pace.
How do I predict my marathon time from a 10K?
Use Riegel's formula: predicted time equals your known time multiplied by (new distance divided by known distance) raised to the power 1.06. A 50 minute 10K predicts a marathon of about 3 hours 51 minutes. Treat this as a best case, since it assumes you have done the specific long-run and fuelling training the marathon requires.
How do I improve my running pace?
Run most of your weekly volume easy, at a pace where you can hold a conversation, and add one or two harder sessions such as tempo runs or intervals. The common mistake is running every session at a moderate pace, which is too hard to recover from and too easy to drive adaptation. Increase weekly mileage gradually, by no more than about 10 percent.
Should treadmill pace match my outdoor pace?
Not exactly. A treadmill removes wind resistance and the belt assists slightly, so the same effort usually produces a faster treadmill pace. Setting a 1 to 2 percent incline is the usual way to approximate outdoor road effort.