Use the free Running Pace Calculator below: your data never leaves your browser — all work happens on your device, and nothing is uploaded to any server.
What This Calculator Does
A running pace calculator converts between the three numbers every runner talks about: distance, time, and pace. Pace is how long each kilometre (or mile) takes you, usually written as minutes per kilometre. Speed is distance per hour. Finish time is pace multiplied by distance. If you know any two, you can find the third. This tool does that arithmetic instantly, so you can plan races, set training targets, and check whether a goal time is realistic.
The tool accepts distance with either a finish time or a pace. Give it distance and time, and it returns your pace and average speed. Give it distance and a target pace, and it returns your finish time and speed. That covers the two questions runners ask most: how fast did I run, and how fast must I run to finish in a given time? The math assumes an even pace from start to finish, which is a good plan for most races, even if real races include hills, crowds, and tired legs near the end.
How to Use It
Type your distance in kilometres. Then type either your time in minutes or your pace in minutes per kilometre, and click Calculate. For a marathon, type 42.195 kilometres. For a half marathon, type 21.0975. For a 10K, type 10. If your time is 1 hour 32 minutes, type 92 minutes. The result shows your pace to two decimal places, your speed in kilometres per hour, and your finish time in hours, minutes, and seconds. Use it before a race to pick a target, and after a race to analyse what actually happened.
Pace, Speed, and Time, Explained
Pace and speed are two views of the same thing. Pace is time divided by distance, so 50 minutes for 10 kilometres is 5 minutes per kilometre. Speed is distance divided by time in hours, so 10 kilometres in 50 minutes is 12 kilometres per hour. To convert pace to speed, divide 60 by the pace: 60 divided by 5 is 12. To convert speed to pace, divide 60 by the speed. Finish time is pace times distance, so 5 minutes per kilometre over 42.195 kilometres is about 211 minutes, or 3 hours 31 minutes. Keep the units consistent and the math is simple.
A Worked Example
Suppose you want to run 10 kilometres in 50 minutes. Your required pace is 50 divided by 10, which is 5 minutes per kilometre, and your speed is 12 kilometres per hour. Now suppose you train at 6 minutes per kilometre and wonder about a half marathon. Your finish time would be 6 times 21.0975, which is about 126.6 minutes, or 2 hours 6 minutes 35 seconds. If that is slower than your goal, you know how much pace you must gain. A jump from 6 to 5 minutes per kilometre is large; most runners improve gradually, a few seconds per kilometre per training block.
Common Mistakes
The most common mistake is mixing units, such as entering miles while thinking in kilometres, or entering seconds as minutes. A 5-minute kilometre is not a 5-minute mile: a mile is 1.609 kilometres, so 5 minutes per kilometre is about 8 minutes per mile. Another mistake is assuming an even pace on a hilly course; hills slow most runners, so add a buffer to hilly race targets. A third is starting too fast. Even pacing, or a slight negative split where the second half is faster, usually beats starting fast and fading badly.
Frequently Asked Questions
What is a good pace? There is no universal good pace. It depends on age, training, distance, and terrain. Compare yourself with your own past results, not with elite runners. Should I train at race pace? Only part of your training should be at race pace. Most weekly running should be slower and easier, with a smaller share at or near race pace. How do I get faster? Consistent weekly mileage, one harder session per week, strength work, and rest beat occasional heroic workouts.