🏃 Running Pace Calculator

How the Running Pace Calculator Works

Pace, time, and distance are linked: if you know any two, you can calculate the third. Choose what you want to find, fill in the other two, and the calculator does the rest. It also converts your pace between minutes per kilometre and minutes per mile, gives your speed in km/h and mph, and projects finish times for the standard race distances at that pace.

Race projections assume an even pace over the whole distance. In practice most runners slow down over longer races, so treat the half-marathon and marathon times as best-case targets rather than predictions.

Formula

Pace     = time ÷ distance
Time     = pace × distance
Distance = time ÷ pace
1 mile = 1.609344 km   →   pace per mile = pace per km × 1.609344

How to Use It

1. Choose whether to calculate pace, finish time, or distance.
2. Pick km or miles and enter the two known values (use a preset for race distances).
3. Read the result, your speed, and projected times for 5K to marathon.

Frequently Asked Questions

How do I calculate my running pace?

Divide your total time by the distance. For example, 50 minutes for 10 km is a pace of 5:00 per kilometre, which is about 8:03 per mile.

What is a good pace for a 5K?

It varies enormously with age and experience. Many recreational runners finish a 5K in 25–35 minutes (about 5:00–7:00 per km), while beginners who mix running and walking may take 35–45 minutes. Consistency matters more than any benchmark.

How long is a half marathon and a marathon?

A half marathon is 21.0975 km (13.1 miles) and a marathon is 42.195 km (26.2 miles).

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Formula and content last reviewed: September 2026. All calculations run in your browser — nothing you enter is sent to or stored on our servers.