The metric treadmill problem
Metric treadmills show kilometres per hour; runners think in minutes per kilometre. Eleven km/h is 5:27 per kilometre, and 12 km/h is exactly 5:00. A min per km calculator does that division for you, which matters because the arithmetic is easy for round numbers and awkward at 11.3 km/h.
Why the table stops at 20 km/h
Most home treadmills top out at 20 km/h, which is 3:00 per kilometre — faster than almost anyone can hold for 5 km indoors. The table covers the range you will actually use, from a 8 km/h walk to a 20 km/h sprint.
Speed and race times
The race projections assume you could hold the belt speed for the whole distance. That is reasonable for 5 km at a moderate pace and optimistic for a marathon, where fatigue costs most runners 3–8%.
Frequently Asked Questions
How fast is 10 km/h in minutes per mile?
10 km/h is 6:00 per kilometre, or 9:39 per mile.
Is treadmill pace accurate?
The belt speed is accurate; your stride is not. Holding onto the rails or overstriding shortens your effective distance, so treat the number as a guide.
Can I use this for cycling?
It works arithmetically, but cyclists usually prefer km/h directly. The bike split calculator is built for that.
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