Treadmill
Pace Converter
A 1% incline makes treadmill running match the road. Running 6:00 per km at 2% incline costs about the same energy as 5:44 per km on flat ground, and at 5% it is about 5:05 per km. Enter your speed and incline for your own equivalent pace.
Last updated: 2026-10-25 · Free, runs in your browser, nothing uploaded or stored
Converter
With the offset on, 1% incline counts as flat road running, because the belt removes air resistance.
Runs in your browser. Nothing you enter is uploaded or stored.
The effective effort change is +4.5% in speed. This uses the ACSM running equation, which fits steady running on moderate grades at speeds above about 8 km/h.
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Open toolIncline equivalence table
Flat-road equivalent of two common treadmill speeds at each incline, with the 1% road offset applied, plus the belt speed that matches a 12.0 km/h (5:00 per km) road run. At 0% the belt is easier than the road, so the equivalent pace is slightly slower than the display.
| Incline | 10 km/h belt = flat pace | Belt for 5:00/km road |
|---|---|---|
| 0% | 6:17 /km | 12.6 km/h |
| 1% | 6:00 /km | 12.0 km/h |
| 2% | 5:44 /km | 11.5 km/h |
| 3% | 5:30 /km | 11.0 km/h |
| 4% | 5:17 /km | 10.6 km/h |
| 5% | 5:05 /km | 10.2 km/h |
| 6% | 4:54 /km | 9.8 km/h |
| 8% | 4:34 /km | 9.1 km/h |
| 10% | 4:16 /km | 8.5 km/h |
Calculated with the same function as the converter above. Treat steep inclines above about 10% with caution, since the model was built for moderate grades.
How this is calculated
The ACSM running equation says oxygen cost is 0.2 × speed + 0.9 × speed × grade + 3.5. Setting the cost of running on a grade equal to the cost of running flat gives flat speed = speed × (1 + 4.5 × grade). With the road offset on, grade is your incline minus 1%. No race results data is used here, so there is no sample size. It is a physiological model, not a measurement of your own running.
Sources and limits
- Jones AM, Doust JH. A 1% treadmill grade most accurately reflects the energetic cost of outdoor running. J Sports Sci 1996;14(4):321-327.
- American College of Sports Medicine. ACSM's Guidelines for Exercise Testing and Prescription, running metabolic equation.
- The equation fits steady running above about 8 km/h on grades up to roughly 10 to 15%. It does not model downhill running, fatigue, shoes, heat or individual running economy.
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FAQ
Frequently Asked Questions
What incline equals outdoor running?
About 1%. Jones and Doust found in 1996 that a 1% treadmill incline matched the energy cost of road running, because the belt removes air resistance. At slower paces the gap is smaller, and many runners feel 0.5 to 1% is enough. Use 1% for easy runs and keep it constant between sessions.
How do I convert treadmill pace to outdoor pace?
Use incline to adjust the speed. Each 1% of grade above the 1% road offset makes running about 4.5% harder than flat. For example, 6:00 per km at 2% is about 5:44 per km on a flat road. Enter your speed and incline above and the tool does this arithmetic for you.
What treadmill speed matches my outdoor pace?
Choose an incline, then reduce the belt speed by the grade effect. To match a 5:00 per km outdoor effort on a 3% incline, the formula gives about 11.0 km/h on the belt, against 12.0 km/h outdoors. The steeper the incline, the lower the belt speed needs to be.
Is treadmill running easier than outdoor running?
At the same speed and 0% incline, usually yes, mostly because there is no wind to push against. The difference grows with speed. Treadmills can also feel harder because of heat, monotony and a fixed pace. Setting a 1% incline removes most of the energy gap, though the feel can still differ.
How accurate is the incline conversion?
It is a good guide for steady running on moderate grades, roughly 0 to 10%, at speeds above about 8 km/h. It ignores running economy, fatigue, shoes and downhill running, and it gets less reliable at steep grades. Treat the result as an equal-effort estimate, not a race prediction.
Can I use this for HYROX running training?
Yes, for easy and threshold runs. HYROX runs are on flat ground, so a treadmill session at a small incline lets you match your race pace effort. A 6:00 per km run at 5% incline is about 5:05 per km flat in energy cost, which is a useful hill session reference.
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