Running Pace Calculator
Pace, speed and time for any distance.
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Turn a run into numbers you can train with. Enter your time and distance to get your pace in minutes per kilometre and per mile, along with your speed — or flip it around to predict how long a target distance will take at a given pace.
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Running Pace — The Quick Answer
Pace is simply time divided by distance. A 25-minute 5K is a 5:00/km pace (or about 8:03/mile). Enter any time and distance to get both figures instantly.
Shortcut
Pace = Time ÷ Distance | Speed = Distance ÷ Time
Common race distances
| Race | Distance (km) | Distance (miles) |
|---|---|---|
| 5K | 5.00 | 3.11 |
| 10K | 10.00 | 6.21 |
| Half marathon | 21.10 | 13.11 |
| Marathon | 42.20 | 26.22 |
Pace is usually quoted per kilometre or per mile depending on where you are. This calculator shows both, so you can read it whichever way your training plan is written.
How It Works
The Formulas
Time, pace and speed
Formula
Pace = Time ÷ Distance Speed = Distance ÷ Time Time = Pace × Distance
Variables
Minutes per unit distance
How long each kilometre or mile takes, e.g. 5:30/km. Lower is faster.
Distance per hour
The inverse view of pace — how many km or miles you cover per hour.
Total duration
The overall run time, entered or predicted from pace and distance.
Note: Pace and speed are reciprocals: a faster pace means a higher speed. Many watches show one or the other — this calculator gives both so you're never caught out.
Worked Example: A 25-Minute 5K
From time and distance to pace and speed
Divide total time by distance
25:00 ÷ 5 km = 5:00 per km
Convert to per mile (× 1.609)
5:00 × 1.609 ≈ 8:03 per mile
Or express it as speed
60 ÷ 5 = 12 km/h
Reference Guide
| Race | Distance | Finish time at 5:00/km |
|---|---|---|
| 5K | 5.0 km | 25:00 |
| 10K | 10.0 km | 50:00 |
| Half marathon | 21.1 km | 1:45:33 |
| Marathon | 42.2 km | 3:31:00 |
How to Use Pace in Training
Pace, speed, and smart race pacing
Pace is time per distance, so 4:30/km is quicker than 5:00/km even though the number is smaller. Speed (km/h or mph) is the inverse — a 5:00/km pace equals 12 km/h. Pace is the runner's native unit because it maps directly onto race planning.
Best for: Reading your watch and planning race splits
Running the second half as fast or slightly faster than the first (a negative split) usually beats starting too hard and fading. Starting conservative preserves energy and tends to produce a faster overall time and a stronger finish.
Best for: Pacing a race distance well
Heat, hills, fatigue, and surface all change how a given pace feels. Judge easy runs by effort (or heart rate), not a fixed pace, and build volume gradually. This is general training guidance, not medical advice.
Best for: Adjusting expectations to conditions
What Is Running Pace?
Running pace is how long it takes to cover a set distance — minutes per kilometre or per mile — rather than distance per hour. Runners prefer it to speed because it maps directly onto how a run feels and onto race planning: if you know your target pace and the distance, you know your finish time, and vice versa. The one quirk is that lower numbers are faster, since a smaller time-per-km means quicker running. This calculator converts freely between pace, speed, and finish time, and handles kilometres and miles so a training plan written in either unit is easy to follow.
Key Features
💡 Pro Tips
- →Use a recent race to find your realistic pace rather than guessing — effort on the day is the honest guide.
- →To hit a time goal, work backwards: goal time ÷ distance gives the pace you need to hold.
- →Practise race pace in training so it feels familiar, but keep most easy runs genuinely easy.
- →On hilly or hot courses, plan by effort rather than a rigid pace — your watch pace will naturally vary.
Common Mistakes
Starting a race too fast
Going out quicker than goal pace floods the legs with early fatigue you can't undo, leading to a painful positive split. A slightly conservative start usually produces a faster overall time.
Confusing pace with speed
They're inverses: lower pace numbers mean faster, higher speed numbers mean faster. Mixing them up leads to misreading how fast a target really is.
Expecting the same pace in all conditions
Heat, hills, wind, and fatigue change what a pace costs. Judging easy days by effort rather than a fixed pace prevents overtraining.
Research & Citations
Sources and standards referenced for the factual claims on this page
- [1]
Daniels, J. (2013). Daniels' Running Formula (3rd ed.). Human Kinetics.
Standard reference on training pace and intensity.
View source - [2]
World Athletics (2023). Standard road race distances. worldathletics.org.
Official distances for 5K, 10K, half marathon, and marathon.
View source
This calculator is a reference tool, not a substitute for professional advice. Verify important health, financial, legal, or safety decisions with a suitably qualified professional.
Last updated: October 7, 2026
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Frequently Asked Questions
How do I calculate my running pace?
Divide your total time by the distance. If you run 10K in 50 minutes, your pace is 50 ÷ 10 = 5 minutes per kilometre. This calculator also converts it to minutes per mile.
What pace is a 25-minute 5K?
5:00 per kilometre, or about 8:03 per mile. Enter '5' km and a time of 25:00 in the calculator to confirm it, or to see the equivalent speed.
How do I convert pace to speed?
Speed is 60 ÷ pace (in min/km) for km/h. A 5:00/km pace is 60 ÷ 5 = 12 km/h. For miles, divide 60 by your min/mile pace to get mph.
How do I predict my time for a new distance?
Take your pace from a recent run and multiply it by the new distance — that gives a straight-line estimate. For a more realistic prediction at longer distances, where you'll slow down, use the race time predictor, which applies the Riegel formula.