Pace Calculator — Work Out Your Running Pace
Running 10 km in 52 minutes gives an average pace of 5:12 per kilometre, or 8:22 per mile. At that pace you would finish a half marathon in about 1:50 and a marathon in roughly 3:40 — though that assumes you can hold the same pace over the longer distance, which is optimistic.
What is Pace Calculator?
Pace is the most useful number for planning runs and races, because it lets you compare efforts across different distances.
Average pace smooths out everything that happened during the run — hills, stops and surges. That makes it a planning figure rather than a measure of how hard you worked.
Projected times for longer races assume you can hold pace, which is optimistic. Fatigue means realistic race pace slows as distance grows.
How to use this calculator
- Choose kilometres or miles.
- Enter the distance you covered.
- Enter your total time in hours, minutes and seconds.
- Read your pace and the projected times for standard race distances.
How pace is calculated▾
Pace is total time divided by distance. The calculator converts between minutes per kilometre and minutes per mile, and projects your pace across standard race distances. Those projections are pure arithmetic — they do not account for fatigue, terrain or fuelling.
Pace = total time ÷ distance
min per mile = min per km × 1.60934
Speed (km/h) = distance ÷ time (hours)Source: Standard race-pace conversion.
Frequently asked questions
How do I convert min/km to min/mile?▾
Multiply by 1.609. A 5:00 per km pace is about 8:03 per mile. This calculator does the conversion for you.
Are the race projections realistic?▾
They assume you hold the same pace, which most people cannot do over a longer distance. Treat them as a ceiling rather than a target.
What is a good running pace?▾
Entirely relative to your fitness. Beginner joggers often run 6–8 min per km; regular club runners 4–5 min per km; competitive club runners under 4 min per km.
Should I run by pace or by heart rate?▾
Pace suits flat races and interval sessions. Heart rate is better in heat, on hills, or on easy days when external conditions distort pace.
Related calculators
References & method
- Standard race-pace conversion.
Every formula, its published source and its assumptions are listed on our methodology page. This page is written for information and has not been reviewed by a clinician.
Read the methodology →These figures are estimates from population formulas, not medical advice. Individual needs vary. If you are pregnant, managing a medical condition, or under 18, talk to a doctor before changing your diet.