Treadmill Pace Converter
Convert treadmill speed (mph or kph) and incline to running pace per mile, per kilometre, and an outdoor-equivalent pace. Free, instant, no account.
A 1% incline offsets the wind resistance absent on a treadmill. Steeper inclines add roughly 13 seconds per mile per additional 1% of grade.
Quick Reference: mph → pace
| mph | kph | min/mi | min/km |
|---|---|---|---|
| 5.0 | 8.0 | 12:00 | 7:27 |
| 5.5 | 8.9 | 10:55 | 6:46 |
| 6.0 | 9.7 | 10:00 | 6:13 |
| 6.5 | 10.5 | 9:14 | 5:44 |
| 7.0 | 11.3 | 8:34 | 5:19 |
| 7.5 | 12.1 | 8:00 | 4:58 |
| 8.0 | 12.9 | 7:30 | 4:40 |
| 8.5 | 13.7 | 7:04 | 4:23 |
| 9.0 | 14.5 | 6:40 | 4:08 |
| 10.0 | 16.1 | 6:00 | 3:44 |
| 12.0 | 19.3 | 5:00 | 3:06 |
What this converter does
Enter your treadmill speed and incline. The tool returns:
- Treadmill pace — the literal pace your treadmill is running. Pace per mile = 60 ÷ mph. Pace per km = 60 ÷ kph.
- Outdoor-equivalent pace — the flat outdoor pace metabolically equivalent to your treadmill effort. This adjusts for incline using the widely-used coaching heuristic of approximately 13 seconds per mile per 1% of grade above 1%.
Why the offset starts at 1% and not 0%: research by Jones and Doust (1996) demonstrated that a 1% treadmill incline most closely approximates the energetic cost of outdoor running at the same speed, because outdoor running carries a small wind-resistance penalty that the treadmill removes. Most coaches now treat 1% as the “match outdoor” setting, and any incline above 1% as a true climbing stimulus.
How to use this for training
Easy runs. Set the treadmill to 1% and ignore the outdoor-equivalent. Run by feel or by VDOT pace from the VDOT Calculator.
Long runs. 1% works for most of the run. Avoid steeper inclines for sustained efforts — the eccentric load is different on a treadmill than outdoors, and your hamstrings will notice.
Hill simulation. Steeper inclines (5–12%) are excellent climbing-specific training when no hills are available. Use the outdoor-equivalent pace as a rough check: if the equivalent pace is faster than your VDOT Interval zone, you’re running a VO2 max workout regardless of what the watch says about speed.
Tempo and threshold work. A 1–2% incline at threshold speed approximates an outdoor threshold run closely. Aim for the pace zone, not the speed number.
Why the conversion is approximate
Three sources of error:
Belt accuracy. Commercial treadmills are calibrated within ±3%. A “7.0 mph” reading can be 6.79 to 7.21 mph. For exact pace, run on a known-accurate track or measured outdoor course.
Biomechanical differences. Even at the same VO2 cost, treadmill running shifts force distribution. Stride is shorter, cadence higher, eccentric load lower. Race times don’t translate directly from long treadmill miles to outdoor races without some outdoor adaptation.
Cooling. Treadmill running raises core temperature faster than outdoor running at the same intensity because there’s no airflow. A fan helps. Heart rate will run 5–10 bpm higher at the same pace indoors.
For more on translating treadmill speed to your training paces, see the Running Pace Chart or use the Pace Calculator to do the inverse — convert a target pace into the treadmill speed you should set.
Want all of this in your pocket, offline, with no subscription? Pacesmith is a $1.99 iOS app — VDOT zones, race predictions, pace math, and split planning, no internet required, one-time purchase.