Running Pace Calculator

Checked 15 October 2026. What was checked. How these pages are maintained.

Pace, time, and distance

Time = pace × distance. Pace = time ÷ distance. Distance = time ÷ pace. A 5 km in 27:30 is 5:30 per kilometre. For miles, enter the distance in miles and read pace as per mile — the math is the same.

Worked example

A 10 km race in 50 minutes is 5:00 per kilometre, or about 8:03 per mile. The same pace for a half marathon (21.1 km) is about 1:45:30 if you hold it.

Hills, heat, and a starting-line surge change the result. This is distance ÷ time, not a training plan. Use kilometres or miles consistently in every box.

Two numbers in, the third out

Pace is time divided by distance. Five kilometres in 27:30 is 27.5 minutes ÷ 5 = 5.5 minutes, which is 5:30 per kilometre. Time is pace times distance. Hold 5:30 for a half marathon, 21.0975 km, and the finish is 21.0975 × 330 seconds = 6,962 seconds, or 1:56:02. Distance is time divided by pace. Clear the box you want solved. If you fill all three, the page recalculates pace from distance and time and the pace you typed is ignored.

The result label says “per km” even when you typed miles. The arithmetic does not know the unit. If the distance box says 10 and you mean 10 miles, the pace is per mile and you have to read it that way. Do not mix a kilometre pace with a mile distance in the same solve.

Even splits are the assumption

Hills, heat, a headwind, and a first kilometre that was too fast are not in the division. A pace chart is the even-split version of a race you have not run yet. Use it to pick a start, then expect the watch to disagree. The page does not store a training plan and it does not convert a 5 km pace into a predicted marathon. That prediction needs a model this form does not have. If you want kilometres turned into miles before you type them, the unit converter uses the exact mile of 1,609.344 metres.

A 10 km check you can do without the form

Ten kilometres at 5:30 per kilometre is 55 minutes exactly, because 10 × 5.5 = 55. The same pace per mile is a different race. A 10 mile run at 8:51 per mile is about 88.5 minutes, close to 1:28:30, and that pace is the mile equivalent of 5:30 per kilometre only because a mile is 1.609344 kilometres and 5.5 × 1.609344 is about 8.85 minutes. If you type 10 in the distance box and 55:00 in the time box, the page returns 5:30 and labels it per kilometre. If those 10 were miles, you have just calculated a per-mile pace and the label is wrong until you remember which unit you meant. Write the unit next to the result before you compare it with a watch that is set to the other system.

Common questions