What pace do I need for a sub-2-hour half marathon?

Faster than about 5:41 per kilometre, or 9:09 per mile, held for the full 21.0975 km. Choose "Finish time" mode, select the half marathon preset and try paces around 5:40 to see the margin.

Can I use this for walking or cycling?

Yes — pace and speed work the same way for any activity. Cyclists usually think in speed (km/h or mph), which the calculator shows alongside pace.

Pace Calculator

Calculate your pace from a distance and time, predict your finish time at a target pace, or work out how far you'll go — with results per kilometre and per mile.

Distance

Distance unit

Time

h:mm:ss or mm:ss, e.g. 1:45:30

Pace = time ÷ distance; speed = distance ÷ time. Results assume an even pace over the whole distance — hills, wind, terrain and fatigue all change real-world times. 1 mile = 1.609344 km.

5:00 /km

Pace per km

8:03 /mi

Pace per mile

25:00

Finish time

5 km · 3.11 mi

Distance

Speed (km/h)

7.46

Speed (mph)

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How to use pace calculator

1Choose what you want to calculate: pace, finish time or distance.
2Enter the two values you know — use a race preset for 5K, 10K, half marathon or marathon.
3Enter times as h:mm:ss or mm:ss, and paces as minutes:seconds.
4Read pace per km and per mile, finish time, distance and speed.

About this tool

Pace is time divided by distance — usually given as minutes per kilometre or minutes per mile — while speed is distance divided by time. A 5K in 25:00 is a 5:00 /km pace, which is 8:03 per mile or 12 km/h. The calculator works in kilometres internally and converts with the exact definition 1 mile = 1.609344 km.

Predicting a finish time multiplies your target pace by the race distance: a half marathon (21.0975 km) at 5:30 /km takes about 1:56:02. Working out distance divides your total time by your pace.

Results assume you hold an even pace the whole way. Hills, heat, wind, surface, crowds and fatigue all affect real race times, so use the predictions as a guide for planning training and pacing rather than a guarantee.

Frequently asked questions

Multiply the pace per kilometre by 1.609344. A 5:00 /km pace is 8:02.7 — about 8:03 — per mile. To go the other way, divide pace per mile by 1.609344.

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