Pace calculator
This pace calculator works out running or walking pace, finish time or distance when you know the other two. It shows pace per kilometer and per mile, speed, and finish times at that pace for 5K, 10K, half marathon and marathon. Runners use it to plan training and race goals.
- Runs in your browser
- Free, no account needed
- Copy or download the result
Result
Example
Find: Pace (from distance and time) Distance: 10 Distance unit: Kilometers Time: 0:52:30 Pace: 5:15 Pace unit: Per kilometer
Pace: 5:15 per km (8:27 per mile) Distance: 10 km (6.21 miles) Time: 0:52:30 Pace: 5:15 per km, 8:27 per mile Speed: 11.43 km/h (7.10 mph) Finish times at this pace: 5K 0:26:15 10K 0:52:30 Half marathon 1:50:46 Marathon 3:41:31 Times and paces are rounded to the nearest second.
How to use the pace calculator
- Choose what to Find: pace, time or distance.
- Fill in the other two: Distance with its unit, Time as h:mm:ss, or Pace as m:ss with its unit.
- Press Run.
- Read the results and race times, then use Copy result or Download.
How it works
Pace equals time divided by distance, time equals pace times distance, and distance equals time divided by pace.
One mile is 1.609344 km. A half marathon is 21.0975 km and a marathon is 42.195 km.
Times can be written as h:mm:ss or mm:ss, and paces as m:ss or h:mm:ss. Results are rounded to the nearest second.
Distances above 0 and up to 1,000 km or miles are allowed, and values that are zero are rejected.
Everything runs in your browser. Your input is not uploaded or stored.
Questions and answers
What pace do I need for a sub 4 hour marathon?
About 5:41 per km, or 9:09 per mile. Choose Find pace, enter 42.195 km and 4:00:00, and press Run.
How do I convert pace per km to pace per mile?
Multiply the pace per km by 1.609344. A 5:00 per km pace is about 8:03 per mile.
Does this work for walking or cycling?
Yes, the math is the same for any steady speed. Speed is shown in km/h and mph too.