Treadmill Pace Calculator

About the Treadmill Pace Calculator

Treadmills display speed — in kilometres per hour or miles per hour — but runners think in pace: minutes per kilometre or per mile. If your training plan says "run 8 km at 5:30 per km", you need to know what to set on the treadmill; if you ran at 11 km/h for 40 minutes, you want to know what that means for your 10K. Converting in your head is fiddly, especially mid-run.

This treadmill pace calculator converts speed to pace and pace to speed, in metric or imperial units, shows both side by side, and gives the matching 5K, 10K and half marathon times. It also shows the flat-ground equivalent of running on an incline, using the American College of Sports Medicine running equation, so you can match treadmill sessions to outdoor efforts.

How to Use the Treadmill Pace Calculator

Choose Speed to pace or Pace to speed.

Enter the treadmill speed, or the pace as m:ss.

Choose km/h and per km or mph and per mile.

Optionally, enter the treadmill incline as a percentage.

The Formulas

  pace (minutes per km)   = 60 ÷ speed (km/h)
  pace (minutes per mile) = 60 ÷ speed (mph)
  speed                   = 60 ÷ pace (in minutes)

  incline (ACSM running equation):
      VO₂ = 0.2 v + 0.9 v × grade + 3.5
      equivalent flat speed = speed × (1 + 4.5 × grade)

Step-by-Step Examples

10 km/h to pace.

  60 ÷ 10 = 6 minutes → 6:00 per km
  = 6.21 mph = 9:39 per mile
  5K 30:00 · 10K 1:00:00 · half marathon 2:06:35

8:00 per mile to speed.

  60 ÷ 8 = 7.5 mph = 12.07 km/h

10 km/h at a 1% incline.

  10 × (1 + 4.5 × 0.01) = 10.45 km/h on the flat → about 5:44 per km

Treadmill Speed and Pace Chart

  km/h   Pace/km   mph    Pace/mile
   8     7:30      4.97   12:04
   9     6:40      5.59   10:44
  10     6:00      6.21    9:39
  11     5:27      6.84    8:47
  12     5:00      7.46    8:03
  13     4:37      8.08    7:26
  14     4:17      8.70    6:54
  15     4:00      9.32    6:26
  16     3:45      9.94    6:02

Why Use a 1% Incline?

Running outdoors, you push against the air. On a treadmill there is no air resistance, and the moving belt makes running slightly easier in other ways too. A widely cited 1996 study by Andrew Jones and Jonathan Doust found that setting the treadmill to a 1% incline makes the effort roughly equal to running outdoors on the flat, for speeds of about 10.5 to 18 km/h. At slower speeds the difference is small, and at very high speeds more incline may be needed. Many runners simply leave the treadmill on 1% as standard.

Incline Training

Running uphill raises the effort sharply without raising the speed, which reduces the impact on the legs. According to the ACSM equation, each 1% of incline adds about 4.5% to the effort: 10 km/h at a 4% incline feels like about 11.8 km/h on the flat. Incline sessions are a good way to build strength and fitness for hilly races, but they work the calves and Achilles tendons harder, so increase the incline gradually.

Treadmill Accuracy

Treadmill displays are not always accurate. The belt can slip, and calibration drifts over time, so the actual speed may differ from the display by a few percent — more on old or heavily used machines. If a pace that feels easy outdoors feels very hard on a particular treadmill, or vice versa, the machine may need calibrating. Comparing the treadmill's speed with a foot pod or with the time taken for a known number of belt revolutions can reveal the error.

Structuring Treadmill Workouts

The treadmill is ideal for controlled sessions because the pace cannot drift. For intervals, set the speed for the fast repetitions — for example 5K pace for 3 minutes — and a slower speed for the recoveries. For tempo runs, set a steady speed a little slower than 10K pace. For easy runs, choose a speed that allows conversation. This calculator converts each target pace from your plan into the speed to enter.

Converting a Treadmill Run to Outdoor Pace

After a treadmill session, you may want to know what it means for an outdoor race. Start with the average speed and convert it to pace. If you ran at 0% incline, expect the same pace to feel slightly harder outside, because of air resistance; if you ran at 1%, the paces should feel similar. Hills and wind outdoors, and differences in temperature and humidity, matter as much as the treadmill setting, so treat any conversion as a guide rather than an exact match.

Walking on a Treadmill

The same conversions apply to walking. A treadmill speed of 5 km/h is a pace of 12:00 per km, or about 19:19 per mile; 6 km/h is 10:00 per km. For brisk walking workouts, many people raise the incline rather than the speed, which increases the effort without needing to break into a run.

Understanding Your Result

The headline gives the pace (or speed, in pace-to-speed mode).

The speed and pace line gives both in metric and imperial.

The incline line gives the flat-ground equivalent when an incline is entered.

The race times line gives 5K, 10K and half marathon times at this speed.

When Should You Use This Calculator?

Use it to set the treadmill for a paced training session.

Use it to convert a treadmill run into pace per km or mile.

Use it to match treadmill and outdoor efforts with an incline.

Use it to plan interval and tempo workouts.

Common Mistakes

Assuming treadmill and outdoor paces feel identical. Add a 1% incline.

Mixing km/h and mph. Check the treadmill's units before converting.

Trusting an uncalibrated treadmill. Displays can be a few percent out.

Rounding the speed too much. 0.1 km/h makes a noticeable difference to pace over long runs.

Holding the handrails. Leaning on them reduces the effort, so the pace no longer matches the same effort outdoors.