How to use the pace and speed calculator
Convert running pace per kilometre to speed and finish times. Enter pace in the field above; the speed, speed, 5 km time, 10 km time, marathon time are computed instantly and plotted on the chart so you can see how the answer changes.
Formula
Variables
- pace — Pace (min/km)
Worked example
With pace = 5 min/km, the calculator gives speed ≈ 12 km/h; speed ≈ 7.456452 mph; 5 km time ≈ 25 min; 10 km time ≈ 50 min; marathon time ≈ 3.51625 h.
Frequently asked questions
What is the formula for the pace and speed calculation?
Speed (km/h) = 60 / pace. Speed (mph) = [Speed] × 0.621371. 5 km time (min) = 5 × pace. 10 km time (min) = 10 × pace. Marathon time (h) = 42.195 × pace / 60. Here pace is pace (min/km).
What inputs do I need for the pace and speed converter calculator?
You need pace in min/km. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use this calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.