Running Pace Calculator

Calculate running pace and speed from distance and time, finish time from a target pace, or the pace needed for a target time. Use km, miles or metres, 5K to marathon presets, and see min/km, min/mile, km/h, mph and split times.

Health & Fitness Runs client-side Free to use

Jump to the tool

About the Running Pace Calculator

Running Pace Calculator converts between distance, time, pace and speed. Work out your pace and speed from a distance and elapsed time, predict a finish time from a distance and a target pace, or find the pace you would need to cover a target distance in a target time. Distances can be entered in kilometres, miles or metres, with presets for 1 km, 1 mile, 5K, 10K, half marathon (21.0975 km) and marathon (42.195 km).

Results show pace per kilometre and per mile and speed in km/h and mph, together with a table of even-pace split times every 1 km, 1 mile, 5 km or an interval you choose. All values are straightforward mathematical conversions, rounded to the nearest 0.1 second; the tool does not predict race performance, fitness or injury risk.

How to use

Choose what to calculate: pace, finish time or required pace.
Pick a common distance or enter your own in km, miles or metres.
Enter the time in hours, minutes and seconds — or the target pace.
Choose a split interval.
Click Calculate, then copy or download the summary.

Key features

Three modes: pace from time, finish time from pace, required pace for a target.
Kilometres, miles and metres with race-distance presets.
Pace in min/km and min/mile; speed in km/h and mph.
Even-pace splits every 1 km, 1 mile, 5 km or a custom interval.
Validation of unrealistic times and distances.
Copy and download summary, Reset and Back.

Best practices

Use the exact race distance (for example 21.0975 km for a half marathon).
Remember course, weather and elevation affect real pace.
Use splits as a guide; even pacing is a simplification.
Check your watch’s distance against known distances.
Seek coaching advice for training plans.

Benefits

Fast conversions between pace, speed and time.
Works in metric and imperial units.
Handy split tables for race days.
Private and free.

Frequently asked questions

How is pace calculated?

Pace = time ÷ distance. For example, 5 km in 25:00 is 25 ÷ 5 = 5:00 per km. Pace per mile is pace per km × 1.609344.

What is the difference between pace and speed?

Pace is time per distance (minutes per km or mile); speed is distance per time (km/h or mph). They are two views of the same thing.

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).

How are split times calculated?

The tool assumes an even pace and multiplies the pace by each split distance. The last split covers any remaining distance to the finish.

Why was my time or distance rejected?

Values must be positive, minutes and seconds below 60, distances between 50 m and 1,000 km, and the resulting pace between 1:30 and 60:00 per km.

Can it predict my race time?

No. It only converts the numbers you enter; real performance depends on training, course, weather and many other factors.

Is my information saved?

No. Everything is calculated in your browser. Your measurements, dates and results are not sent anywhere or saved in browser storage, and Reset clears them from the page.