Treadmill pace converter
MPH and incline → real outdoor pace.
Type the speed and incline you ran on the treadmill. Get min/mile, min/km and the outdoor-flat-equivalent pace.
At 6 mph and 1% incline, your treadmill pace is 6:13/km — equivalent to 6:05/km on flat road.
How the conversion works
Pace is just speed inverted. 6 mph = 60/6 = 10 min/mile. We then apply a small adjustment for incline based on Hill’s rule — roughly 13 sec/mile of equivalent outdoor effort per 1% of incline. So 6 mph at 3% incline feels like ~9:21/mile on flat road.
Speed reference table
Conversions for common treadmill speeds. Adjust based on your incline.
| mph | km/h | min/mile | min/km | Outdoor @ 1% |
|---|---|---|---|---|
| 4.0 | 6.44 | 15:00 | 9:19 | 14:47 |
| 5.0 | 8.05 | 12:00 | 7:27 | 11:47 |
| 6.0 | 9.66 | 10:00 | 6:13 | 9:47 |
| 7.0 | 11.27 | 8:34 | 5:20 | 8:21 |
| 8.0 | 12.87 | 7:30 | 4:40 | 7:17 |
| 9.0 | 14.48 | 6:40 | 4:09 | 6:27 |
| 10.0 | 16.09 | 6:00 | 3:44 | 5:47 |
Why set incline to 1%?
A long-running rule among runners is that 1% incline on a treadmill compensates for the lack of wind resistance you’d face outdoors. The original 1996 Jones-Doust study found 1% accurate at speeds above 10.8 km/h (~6.7 mph). For slower runs, 0% is fine.
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FAQ
Why is treadmill running easier than outdoor?
No wind resistance, no terrain variation, and the belt assists slightly with leg turnover. Most runners find treadmill effort 5-10% lighter than outdoor at the same speed — which is why setting 1% incline is a common practice.
How accurate is the incline adjustment?
Hill’s rule (~13 sec/mile per 1% incline) is a solid first approximation. Real energy cost depends on speed, body weight and individual biomechanics. Use it as a planning baseline.
Can I use this for hill workouts?
Yes — set the incline to whatever you ran. The outdoor-equivalent pace tells you what flat-road pace would have demanded the same effort. Useful for comparing hill repeats to flat tempo runs.