256 Tools

Running Pace Calculator

Time (h : m : s)
::
Pace per km
5:00
Pace per mile
8:03
Speed
12.00 km/h
Predicted finish times
5K25:00
10K50:00
Half marathon1:45:29
Marathon3:30:59

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Enter how far you ran and how long it took, and this calculator gives your pace per kilometer and per mile, your average speed, and predicted finish times for a 5K, 10K, half marathon, and full marathon at the same pace. Everything is calculated in your browser.

How to use

  1. Enter the distance in kilometers.
  2. Enter the time as hours, minutes, and seconds.
  3. Read your pace, speed, and predicted race times.

How it works

Pace is the time divided by the distance, so a 50-minute 10K is a 5:00 per-kilometer pace. The per-mile pace converts the distance to miles first, and speed is distance over time expressed as km/h. Predicted race times assume you hold the same pace, so they multiply your per-kilometer pace by each race distance — a useful target, though real races vary with terrain and fatigue.

Time divided by distance gives pace; distance over time gives speed.time÷distance=pace→ km/h

Features

Pace & speed

Get pace per km, per mile, and your average speed.

Race predictions

See 5K, 10K, half and full marathon times at your pace.

km and miles

Read your pace in both kilometers and miles.

Private & instant

All math runs in your browser; nothing is uploaded.

When to use it

Training

Check your pace from a training run.

Race targets

Set a goal pace for an upcoming race.

Treadmill

Convert a treadmill speed into a pace you know.

Planning

Estimate your finish time for a target distance.

Notes

  • Predictions assume an even pace across the whole distance.
  • Real race times vary with hills, weather, and fatigue.
  • Enter time as hours, minutes, and seconds.
  • All calculations run on your device; nothing is uploaded.

FAQ

How is pace calculated?
Pace is your time divided by the distance. A 50-minute 10K is a 5:00 per-kilometer pace.
How accurate are the race predictions?
They assume you hold the same pace. Real races vary with terrain, weather, and fatigue, so treat them as targets.
Can I see miles too?
Yes. The calculator shows pace per kilometer and per mile, plus speed in km/h.
What do I enter for time?
Hours, minutes, and seconds. Leave hours at zero for shorter runs.
Is my data uploaded?
No. Every calculation happens in your browser and nothing leaves your device.

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