Running Pace Calculator
Calculate your running pace, finish time, or distance. Convert between min/km and min/mile.
Common Race Distances
About this calculator
Pace is how long you take to cover a kilometre. This calculator links three numbers: distance, pace and finish time. Fill in any two and it works out the third, and it shows your pace per mile and your speed in km/h.
Tap 5K, 10K, Half Marathon or Marathon to fill the distance with a standard race, then add the pace you hope to hold to see the finish time, or add a goal time to see the pace you need.
How to use it
- Enter the Distance in km, or tap a race button such as 10K.
- Enter either the Pace as min:sec per km (5:30) or the Time as h:mm:ss (0:55:00).
- The third box fills in automatically, with pace per mile and speed shown below.
Pace maths
Pace = Time ÷ Distance, Time = Pace × Distance and Distance = Time ÷ Pace. Speed in km/h is 3,600 ÷ pace in seconds per km, and pace per mile is the pace per km times 1.609.
Worked example
10 km in 55:00, or 10 km at 5:30 per km
| Pace | 5:30 per km |
| Pace per mile | 8:51 |
| Speed | 10.9 km/h |
| Time at 5:30 per km over 10 km | 0:55:00 |
The Riegel race-prediction rule, T2 = T1 × (D2 ÷ D1)^1.06, suggests a runner who does 10 km in 55 minutes could manage about 26:20 for 5 km and about 2:01 for a half marathon, because pace slows over longer distances.
Tips and common mistakes
- Run most of your miles easy, around 60 to 90 seconds per km slower than race pace.
- Start races a little slower than goal pace and finish strong.
- Test fitness on a flat route so pace comparisons are fair.
- Heat, humidity and hills slow everyone, so adjust expectations.
- Build weekly distance by no more than about 10% a week.
Frequently asked questions
How do I calculate running pace?
Divide your time by the distance.
What is a good 10K time?
Under 60 minutes is a common goal for beginners and around 45 minutes for experienced club runners.
How do I convert pace per km to per mile?
Multiply by 1.609.
What pace is a 2-hour half marathon?
About 5:41 per km.
What is Riegel's formula?
A rule of thumb that predicts a race time at another distance from one result.
Does the calculator work for walking?
Yes. Enter any distance and pace.