Treadmill speed to pace, with an incline adjustment
Treadmills show speed in km/h or mph, while runners think in minutes per kilometre or per mile. This treadmill pace calculator converts either way: type 10 km/h and see 6:00 per km and 9:39 per mile, or type the pace you want and read the belt speed to set. It also lists times for a mile, 5K, 10K, half marathon and marathon at that speed.
Add an incline and it estimates the flat pace that would cost your body the same effort, using the ACSM running equation. Use it to plan a treadmill session from an outdoor pace, or to translate a hill-climb workout into something comparable to flat running.
How to use the Treadmill Pace Calculator
- Choose what you have: speed in km/h or mph, or pace per km or per mile.
- Type the value, for example 10 for a speed or 5:30 for a pace.
- Enter the incline in percent. Leave 0 for a flat belt.
- Read the pace and speed in both units, the race times at belt speed and, with an incline, the flat-equivalent pace.
Treadmill Pace Calculator features
Both unit systems
Pace per km and per mile and speed in km/h and mph appear together, whatever you typed.
Incline adjustment
A flat-equivalent pace and an estimated oxygen cost from the ACSM running equation, labelled as approximate.
Race times
Mile, 5K, 10K, half marathon and marathon times at your belt speed.
Speed chart
A reference table from 6 to 16 km/h with mph and both paces.
How the conversions work
Pace = 3,600 ÷ speed in km/h, in seconds per kilometre. At 10 km/h that is 360 seconds, or 6:00 per km. Multiply by 1.609344 for pace per mile (9:39), or divide the speed by 1.609344 for mph (6.21). The mile is exactly 1.609344 km.
On many treadmills 10.0 km/h is 6.2 mph, so a 5K takes 30:00 at 10 km/h. The tool shows this for each distance.
| km/h | mph | Pace /km | Pace /mile |
|---|---|---|---|
| 8 | 4.97 | 7:30 | 12:04 |
| 10 | 6.21 | 6:00 | 9:39 |
| 12 | 7.46 | 5:00 | 8:03 |
| 14 | 8.70 | 4:17 | 6:54 |
Incline and the ACSM running equation
The ACSM running equation estimates oxygen use as VO2 = 0.2 × S + 0.9 × S × G + 3.5 (ml per kg per minute), with S the speed in metres per minute and G the grade as a fraction. The 0.2 term is the cost of moving forward and the 0.9 term the extra cost of climbing. Setting the oxygen cost equal to a flat run gives flat speed = belt speed × (1 + 4.5 × G). At 10 km/h and 2% that is 10.9 km/h, or 5:30 per km.
The equation is meant for steady-state running above about 134 m/min (8 km/h, 5 mph), so the flat-equivalent is hidden below that. It is an average for typical adults, not a measurement of you, and it does not describe downhill running.
Treadmill versus outdoor running
Jones and Doust (Journal of Sports Sciences, 1996) found that a 1% grade best matched the energy cost of outdoor running by offsetting the air resistance you do not meet on a belt. It remains a common rule of thumb, though later analysis suggests that at easier speeds 0 to 1% is close. This tool shows your pace as set, so choose the incline you will use. Plan a race build with the race time predictor and the marathon pace chart. Informational only, not medical or coaching advice.
Treadmill Pace Calculator FAQ
What is 10 km/h on a treadmill in minutes per km?
6:00 per km, which is 9:39 per mile and about 6.21 mph. A 5K at that speed takes 30:00.
How do I convert treadmill mph to pace?
Divide 60 by the mph for minutes per mile. At 6 mph that is 10:00 per mile, or 6:13 per km. Choose Speed in mph and the calculator does both.
Should I set the treadmill to 1% incline?
It is a common rule of thumb to offset the missing air resistance outdoors, based on Jones and Doust (1996). It matters less at easy speeds, and you can leave it at 0 if you prefer.
How accurate is the incline adjustment?
It is an estimate from the ACSM running equation. It suits steady running above about 8 km/h and varies with your running economy, so treat it as a guide for planning.
Why does my pace feel different outdoors?
Wind, terrain, a belt that is not calibrated and your own rhythm all change effort. Treadmill belt speeds can differ from the display, so test with a known distance if it matters.
Can I enter pace instead of speed?
Yes. Choose Pace, min per km or min per mile in the I have box and type minutes:seconds; the belt speed appears in km/h and mph.