Running pace calculator

Calculate your pace in minutes per kilometer, your race time or the distance covered from the other two values. Ideal for preparing a race goal or analyzing a workout. 100% local calculation, no data sent to a server.

Example:

How it works

Pace in minutes per kilometer is the benchmark runners use most to plan a workout or aim for a time in an official race (10K, half marathon, marathon). This tool links three quantities — distance, time and pace — and automatically calculates the missing one from the other two.

How do I convert my pace to speed (km/h)?

Speed in km/h is obtained by dividing 3600 (seconds in an hour) by your pace in seconds per kilometer. For example, a pace of 5:00 min/km (300 seconds) gives a speed of 3600 / 300 = 12 km/h. The tool automatically shows this conversion next to the main result.

What is the "race time" mode for?

If you know the pace you can hold (for example from a recent training run) and the distance of your next race, this mode calculates the estimated finish time — handy for setting a realistic time goal before a competition.

Privacy: your race times and distances are neither stored nor sent; the calculation stays entirely in your browser.