Pace Converter Calculator

Running pace unit conversion translates pace between the two most common formats used worldwide: minutes per kilometer (used in most of the world) and minutes per mile (used primarily in the United States and United Kingdom). It also converts between pace and speed.

Core conversion formulas: min/km to min/mile: Pace (min/mile) = Pace (min/km) × 1.60934 min/mile to min/km: Pace (min/km) = Pace (min/mile) ÷ 1.60934

Pace to speed: Speed (km/h) = 60 ÷ Pace (min/km) Speed (mph) = 60 ÷ Pace (min/mile)

Speed to pace: Pace (min/km) = 60 ÷ Speed (km/h) Pace (min/mile) = 60 ÷ Speed (mph)

What each variable means:

• Pace: time to cover one unit of distance. Expressed as mm:ss (e.g., 5:30 = 5 minutes 30 seconds per km or per mile).
• 1.60934: the exact conversion factor between miles and kilometers (1 mile = 1.60934 km).
• Speed: distance divided by time, expressed as km/h or mph. Runners sometimes use speed on treadmills but pace for race training.

Common race finish times at typical paces:

These assume you hold the pace for the whole distance, which nobody does over a marathon. The calculator shows both that figure and a more realistic one further down.

Worked example: A runner trains at 5:45 per kilometer and wants to know their pace per mile and expected finish times.

Pace (min/mile) = 5.75 min/km × 1.60934 = 9.2537 min = 9:15/mile Speed (km/h) = 60 ÷ 5.75 = 10.43 km/h Speed (mph) = 60 ÷ 9.2537 = 6.48 mph

Race finish times at 5:45/km, using the official distances rather than rounded ones:

• 5K: 5.75 × 5 = 28.75 min = 28:45
• 10K: 5.75 × 10 = 57.5 min = 57:30
• Half marathon: 5.75 × 21.0975 = 121.31 min = 2:01:19
• Marathon: 5.75 × 42.195 = 242.62 min = 4:02:37

Those last two are worth a note. A half marathon is 21.0975 km, not 21.1, and a marathon is 42.195 km, not 42.2. Rounding the distance shifts a marathon prediction by about two seconds, which does not matter, but the calculator uses the exact figures anyway and this is why its numbers differ slightly from charts that do not.

Pace–speed quick reference:

Fill in one box, not four. The four inputs are four ways of saying the same thing, so the calculator reads whichever you filled in and works out the rest. If more than one has a value it uses min/km first, then min/mile, then km/h, then mph, and it tells you which one it used. Clear the others if you want a different one to win.

Race pace usually differs from training pace. Most runners race 30 to 60 seconds per mile faster than their average training pace. If you train at 9:30/mi, expect a race pace closer to 8:45/mi at full effort. The taper week before a race (reduced mileage, full recovery) plus race-day adrenaline accounts for most of the difference. Don’t pace your race off training-pace splits.