Pace Calculator

How to use the Pace Calculator

1. Choose the calculate.
2. Enter the distance and pick its unit – 5K = 5 km, 10K = 10 km, half marathon = 13.1094 mi, marathon = 26.2188 mi.
3. Enter the time – hours.
4. Enter the time – minutes.
5. Enter the time – seconds.
6. Enter the pace – minutes.
7. Enter the pace – seconds.
8. Choose the pace unit.
9. Press Calculate. The result updates automatically as you type, and you can switch the result unit at any time.

About the Pace Calculator

Pace (minutes per mile or kilometer) is how runners and walkers think about speed, because it maps directly to splits on a watch. Use this calculator to plan a race target, check what pace you need to break a time goal, or convert a treadmill speed into a pace.

Common examples: a 25-minute 5K is about 5:00 per km or 8:03 per mile; a 4-hour marathon needs about 9:09 per mile (5:41 per km). On race day, courses measured along the shortest line are hard to run perfectly, so GPS distances usually come out slightly long; build in a few seconds per mile of buffer.

Formula

Pace = time ÷ distance
Time = pace × distance
Distance = time ÷ pace
Speed = distance ÷ time

Times are converted to seconds and distances to meters before dividing. One mile is 1.609344 km, so a pace per kilometer × 1.609344 gives the pace per mile.

Example calculation

Using the default values:

• Calculate = Pace (from distance and time)
• Distance = 5 km
• Time – hours = 0 h
• Time – minutes = 25 min
• Time – seconds = 0 s

the calculator returns:

• Pace per mile: 8:03 /mi
• Pace per kilometer: 5:00 /km
• Time: 25:00
• Distance: 3.11 mi
• Speed: 7.46 mph

Frequently asked questions

Last updated: 2026-10-12 · Category: Health & Fitness calculators