How to Calculate Running Pace

Running pace is simply how long it takes you to cover a set distance — usually expressed as minutes per kilometre (min/km) or minutes per mile (min/mi). Understanding the formula behind it lets you plan workouts, predict race times, and set realistic targets.

The core formula

There are three variables and three equations, depending on which you want to find:

• Pace = Time ÷ Distance
• Time = Pace × Distance
• Distance = Time ÷ Pace

For example: if you run 10km in 55 minutes, your pace is 55 ÷ 10 = 5:30 per km.

Pace vs speed: what's the difference?

Speed and pace are reciprocals of each other. Speed tells you how far you travel per unit of time (km/h or mph). Pace tells you how long you take per unit of distance (min/km or min/mi).

• To convert speed (km/h) to pace (min/km): divide 60 by your speed. A 10 km/h pace is 60 ÷ 10 = 6:00 min/km.
• To convert pace (min/km) to speed (km/h): divide 60 by your pace in decimal minutes. A 5:30 min/km pace is 60 ÷ 5.5 = 10.9 km/h.

Most runners think in pace rather than speed because treadmills aside, measuring instantaneous speed outdoors is harder than noting split times.

Converting between km and mile pace

One mile is 1.60934 km, so:

• To convert min/km to min/mile: multiply by 1.60934
• To convert min/mile to min/km: divide by 1.60934

A 5:00 min/km pace is approximately 8:03 min/mile. A 9:00 min/mile pace is approximately 5:35 min/km.

Calculating your pace from a race time

To find your average pace from a race result, convert your finish time to total seconds, divide by the distance in your preferred unit, then convert back to minutes and seconds.

Example — a 5K in 23:45:

1. Convert to seconds: 23 × 60 + 45 = 1,425 seconds
2. Divide by 5 (km): 1,425 ÷ 5 = 285 seconds per km
3. Convert back: 285 seconds = 4:45 per km

Predicting a race time from your pace

Multiply your target pace (in seconds per km) by the race distance in km.

Example — targeting 5:15 per km for a half marathon (21.0975 km):

1. Convert pace to seconds: 5 × 60 + 15 = 315 seconds/km
2. Multiply by distance: 315 × 21.0975 = 6,646 seconds
3. Convert to time: 6,646 ÷ 60 = 1:50:46

Why pace varies during a run

Your GPS watch shows instant pace, which fluctuates constantly with terrain, effort, fatigue, and signal accuracy. The number that matters for planning is your average pace over the full run or a defined split. Most training plans are built around maintaining a consistent average pace over a workout, not holding a perfectly steady instantaneous pace.

Using pace zones for training

Different types of training require different pace ranges. Running everything at the same effort leads to the "grey zone" — too hard for recovery, too easy for fitness gains. Structured training uses distinct pace zones based on your current fitness. See our pace zones guide for a full breakdown.

Calculate your pace now

Use the PaceCalc running pace calculator to convert between pace, speed, and race time — and to generate training paces based on a recent race result.