Treadmill pace conversion calculator.
A treadmill belt does not charge you for air resistance, and every percent of incline changes the energy cost of the same speed. Convert belt speed and grade into the outdoor road pace that would cost you the same effort.
Treadmill speed to pace chart
| mph | km/h | Pace /mi | Pace /km | Outdoor @ 1% |
|---|---|---|---|---|
| 5.0 | 8.0 | 12:00 | 7:27 | 11:24 |
| 5.5 | 8.9 | 10:55 | 6:47 | 10:22 |
| 6.0 | 9.7 | 10:00 | 6:13 | 9:30 |
| 6.5 | 10.5 | 9:14 | 5:44 | 8:47 |
| 7.0 | 11.3 | 8:34 | 5:20 | 8:10 |
| 7.5 | 12.1 | 8:00 | 4:58 | 7:37 |
| 8.0 | 12.9 | 7:30 | 4:40 | 7:09 |
| 8.5 | 13.7 | 7:04 | 4:23 | 6:44 |
| 9.0 | 14.5 | 6:40 | 4:09 | 6:22 |
| 9.5 | 15.3 | 6:19 | 3:55 | 6:02 |
| 10.0 | 16.1 | 6:00 | 3:44 | 5:44 |
| 11.0 | 17.7 | 5:27 | 3:23 | 5:14 |
| 12.0 | 19.3 | 5:00 | 3:06 | 4:48 |
What each incline is actually worth
| Incline | Energy cost | Use it for |
|---|---|---|
| 0% | 1.00× | Recovery running, or when you want the belt to be genuinely easy. |
| 1% | 1.06× | The default. Closest honest match to flat road running. |
| 2% | 1.11× | Steady and threshold work, or to add load without adding speed. |
| 4% | 1.24× | Sustained climb simulation and strength-endurance sets. |
| 6% | 1.37× | Hill repeats. Short, hard, with full recovery between. |
| 10% | 1.66× | Vertical-specific work for trail and mountain racing. |
Frequently asked
What treadmill incline equals running outside?
1% is the classic answer and it is close to right for moderate to fast running. It compensates for the air resistance you do not face indoors. At easy paces below roughly 9:00/mile the true equivalent is nearer 0.5%, and at 6:00/mile pace it is slightly above 1%.
Is running on a treadmill easier than running outside?
At 0% incline, yes — marginally. You are not pushing through air, there is no camber, no wind and no surface variation. The difference is small: about 1–2% of energy cost at typical training speeds, which is why a 1% incline is used to close the gap.
How do I convert treadmill speed to pace per mile?
Pace per mile = 60 ÷ speed in mph. So 6.0 mph is 10:00/mile, 7.5 mph is 8:00/mile, and 10.0 mph is 6:00/mile. This calculator does the conversion and then applies the incline adjustment on top.
What incline should I use for a treadmill long run?
1% for the bulk of it is a sensible default. Some coaches alternate between 0% and 2% every few minutes to vary the muscular demand, which better mimics the constant micro-changes of road running.
Why does the treadmill feel harder than outside even at the same pace?
Heat, almost always. Without airflow, your core temperature climbs faster, heart rate drifts and perceived effort rises even though mechanical work is identical or lower. Use a fan and judge indoor sessions by effort as well as by pace.
Are treadmill speed readings accurate?
Often not. Belt calibration drifts with wear and with the weight of the runner, and commercial gym machines are rarely recalibrated. Errors of 2–5% are common, so treat any indoor pace as an estimate and anchor your training to outdoor benchmarks where you can.
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How treadmill pace converts to outdoor pace
Minetti et al. (2002) measured the metabolic cost of running at gradients from −45% to +45%. Scaling treadmill speed by the cost ratio gives the flat speed that would take the same energy.
Running outdoors also costs energy to push through still air, which a treadmill belt does not charge you for. The classic correction is about a 1% incline at moderate speeds, and the credit grows with speed because drag rises with velocity squared.
That is why 0% on a treadmill is genuinely slightly easier than the same pace on a flat road, and why 1–2% is the honest setting for steady and threshold work.
Belt calibration varies. Treat the output as a good estimate and cross-check against effort, heart rate and any outdoor benchmark you trust.
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