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Treadmill Pace Conversion Calculator

Turn treadmill speed into road pace and race times.

Result

5:44 /km
9:14 /mi
10.46 km/h
6.50 mph
2.91 m/s
28:41
57:21
2:01:01
4:02:01

How it is calculated

Pace is the time for one distance unit, so it is the reciprocal of speed. The tool converts the speed to km/h (km/h = mph × 1.609344), then computes seconds per km = 3600 / km/h and seconds per mile = 3600 / mph, shown as min:sec (or h:min:sec when slower than an hour per unit). It also shows the speed in km/h, mph and m/s (km/h ÷ 3.6). Race projections are plain multiplication of the km pace by 5, 10, 21.0975 and 42.195 km, so they assume you hold that exact speed for the whole distance, with no slowing over longer races. Speed must be above 0 and no more than 60 in the chosen unit; any unit other than km/h is read as mph.

Worked example

Treadmill set to 6.5 mph. In km/h: 6.5 × 1.609344 = 10.46 km/h. Seconds per km: 3600 / 10.46 = 344, which is 5:44 /km. Seconds per mile: 3600 / 6.5 = 554, or 9:14 /mi. In m/s: 10.46 / 3.6 = 2.91. Holding 5:44 per km, 5 km takes 28:41 and 10 km 57:21. The half marathon (21.0975 km) comes to 2:01:01 and the marathon (42.195 km) to 4:02:01.

Try this example →

Common mistakes

  • Leaving the unit on mph when the console shows km/h (or the reverse). A 10 on a km/h display is 6:00 per km; entered as mph it becomes 3:44 per km.
  • Treating the half and full marathon times as a realistic forecast. They are the same pace repeated for the full distance, which most runners cannot hold, so real times are slower.
  • Reading minutes per km as a decimal. A pace of 5:44 is 5 minutes 44 seconds, not 5.44 minutes.
  • Ignoring that a flat treadmill at 0 % incline is easier than the road for the same effort, so a road pace may differ from the converted number.
  • Typing the pace as the speed, for example 9 for a 9:00 per mile run. The field wants speed (mph or km/h), and 9 mph means 6:40 per mile.

About this calculator

Treadmill displays show speed in miles or kilometers per hour, but runners plan and race by pace — minutes per mile or minutes per kilometer — so converting between the two is a routine step in structuring an indoor workout. The conversion itself is simple arithmetic (pace = 60 ÷ speed), but the useful part is projecting what that steady pace would produce over standard race distances, by multiplying the pace by each distance to get 5K, 10K, half-marathon and marathon finish times. This assumes you hold the same pace the whole way; a fatigue-adjusted model such as Riegel's formula would give slower times over the longer distances.

Runners and coaches use this to translate a treadmill interval session into outdoor pace targets, to gauge fitness against upcoming race goals without leaving the gym, and to set treadmill speed for tempo or threshold work prescribed in min/mile terms. It's especially useful during winter training blocks or bad-weather stretches when most quality sessions happen indoors.

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