Pace calculator

Calculate your pace (min/km) from a distance and a time. Project your other distances.

PaceCalculatorFree · no sign-up

Step 1

Your race data

Distancekm

Total time

min

Tip: use the ↑ ↓ arrow keys, or press and hold the buttons.

Your pace

5:00

min / km

Needle: speed in km/h (0 to 24)

Sub-30 min 5KNice time!

Pace

5:00

min / km

Speed

12.00

km / h

Imperial pace

8:03

min / mile

Imperial speed

7.46

mph

Step 2

Projection at other distances

At constant pace (simple theoretical projection — no fatigue decay).

5K25min 00s5:00 /km
10K50min 00s5:00 /km
15K1h 15min 00s5:00 /km
21.1K (half)1h 45min 29s5:00 /km
42.2K (marathon)3h 30min 59s5:00 /km
50K4h 10min 00s5:00 /km

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How does the pace calculator work?

The calculator takes your distance and your total time, then divides time by distance to give you a pace in min/km. It also converts to km/h, min/mile and mph for compatibility with U.S. watches and treadmills.

How to read your pace?

Pace (min/km): time to cover one kilometre. The lower, the faster.
5:00/km = 5 minutes per kilometre → 12 km/h.
For a marathon at 5:00/km, target time ≈ 3h 30min.

Why projections matter

The “projection at other distances” table assumes a constant pace, which is unrealistic for long distances (fatigue, hydration, terrain). For a more reliable projection over the marathon, use our Riegel race predictor.