Treadmill consoles show speed; training plans talk in pace. Enter either and this calculator gives you the other, along with the finishing times that speed produces over common race distances. It also works backwards: pick a distance and a target time and it tells you what speed to set.
Treadmill pace & speed
Type any one value. The others update as you type.
At this speed
| Distance | Estimated time |
|---|---|
| 1 km | 6:00 |
| 1 mile | 9:39 |
| 5K | 30:00 |
| 10K | 1:00:00 |
| Half marathon (21.1 km) | 2:06:35 |
| Marathon (42.2 km) | 4:13:10 |
Workout: how far will I go?
Distance covered at the speed above for a set time.
Minutes, or h:mm:ss, e.g. 45 or 1:15:00
Target: what speed do I need?
The treadmill speed that finishes a distance in a target time.
h:mm:ss or mm:ss, e.g. 27:30
Treadmill speeds are estimates A treadmill's displayed speed depends on its speed sensor and calibration, and belt wear or slip can make the belt run slower than the console says. Real-world running also differs: there is no air resistance on a treadmill, which is why many runners add about 1% incline. A classic laboratory study found that a 1% grade approximated the energy cost of outdoor running at the running speeds it tested, with little difference at the slower ones; it is a useful convention, not a rule for every runner or treadmill. Use these figures for planning, and check your own treadmill against a known distance if accuracy matters.
How to use it
Type a value in any one of the four boxes like speed in km/h or mph, or pace in minutes per kilometre or per mile, and the other three update as you type. The table underneath shows how long that speed takes over 1 km, 1 mile, 5K, 10K, a half marathon and a marathon.
Common treadmill speeds as pace and a table block with these rows
| Console speed | Pace | 5K time |
|---|---|---|
| 5.0 mph (8.05 km/h) | 12:00 /mile · 7:27 /km | 37:17 |
| 6.0 mph (9.66 km/h) | 10:00 /mile · 6:13 /km | 31:04 |
| 10 km/h (6.21 mph) | 6:00 /km · 9:39 /mile | 30:00 |
| 7.5 mph (12.07 km/h) | 8:00 /mile · 4:58 /km | 24:51 |
| 12 km/h (7.46 mph) | 5:00 /km · 8:03 /mile | 25:00 |
| 8.0 mph (12.87 km/h) | 7:30 /mile · 4:40 /km | 23:18 |
A 30-minute 5K needs 10 km/h; a 25-minute 5K needs 12 km/h (7.5 mph gets you there with a few seconds to spare).
Open “Workout” to see how far you will travel in a set time at that speed, or “Target” to find the treadmill speed that finishes a distance in the time you want.
Why treadmill and outdoor pace differ
A treadmill’s speed is a measurement, not a guarantee. The console reads a sensor on the front roller and converts pulses to km/h or mph, so the figure is only as good as that calibration — and a belt that slips under your weight, or a deck that has dried out, runs slower than the number on the screen. Running form changes too: the belt moves beneath you and there is no air resistance, which is why many runners add about 1% incline. A classic laboratory study (Jones and Doust, 1996) found that a 1% grade approximated the energy cost of outdoor running at the speeds it tested, with little difference at slower paces. A useful convention, not a rule for every runner or treadmill. Treat the times here as planning figures. If the difference matters to you, time yourself over a known distance and compare.