Running Pace Calculator
Pace per km, speed and predicted finish times for 5K, 10K, half and full marathon.
Result
How to use
- 1
Enter the distance you ran in km.
- 2
Enter your finish time in hours, minutes and seconds.
- 3
See your pace, speed and predicted times for other race distances.
Questions
How are race times predicted?
With Peter Riegel's formula: T₂ = T₁ × (D₂ ÷ D₁)^1.06. It assumes you have trained for the longer distance, so marathon predictions from a 5K are usually optimistic.
What is a good pace for beginners?
Most new runners jog at 6:30–8:00 min per km. Many Indian city runs like the 10K events and half marathons have generous cut-off times, so run at a pace where you can still talk.
What is the difference between pace and speed?
Pace is time per kilometre (e.g. 6:00 /km); speed is kilometres per hour (10 km/h). One is simply 60 divided by the other.
About this Pace tool
Running Pace Calculator — Pace per km, speed and predicted finish times for 5K, 10K, half and full marathon. It is one of 200 free tools on namasivayam.in, made by software engineer Namasivayam Vadivelan for everyday use in India.
Everything is calculated instantly in your browser: nothing you type or upload is sent to any server, there is no sign-up, and it works on mobile and desktop. Enter the distance you ran in km.
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Results are estimates to help you plan. They are not financial, tax or medical advice.