Endurometry
Pace = time ÷ distance. Speed = distance ÷ time. 5:00/km is exactly 12.00 km/h (7.46 mph). km/h = 60 ÷ min/km. Use pace on the road; treadmills and ACSM talk speed.
Last updated October 5, 2026
A watch can show 5:00/km or 12.00 km/h for the same stride. They are not two fitness scores. One is time per unit of distance; the other is distance per unit of time. Flip either and you get the other.
The two formulas
pace (min/km) = 60 / speed (km/h) speed (km/h) = 60 / pace (min/km) mph = km/h ÷ 1.609344
The pace converter implements those identities. Display rounding is to a whole second for pace and two decimals for speed — same as methodology.
Same numbers as the converter
| Pace | min/mile | km/h | mph |
|---|---|---|---|
| 5:00/km | 8:03 | 12.00 | 7.46 |
| 5:30/km | 8:51 | 10.91 | 6.78 |
| 6:00/km | 9:39 | 10.00 | 6.21 |
Entering 12 km/h returns 5:00/km. Entering 7.46 mph is the same run within a rounding tick. A 400 m in 2:12 is 5:30/km because 2.2 min / 0.4 km = 5.5.
When to read pace
Road markers are distances. “What should the clock say at km 10?” is a pace question. Race plans, even splits and wristbands are all pace. See what pace is if you still want the definition from time and distance.
When to read speed
Treadmills, bike computers and the ACSM calorie equation speak metres per minute or km/h. Indoor 10 km/h at 0% is 6:00/km; adding grade changes cost, not the belt’s displayed speed. Convert with the treadmill converter when you care about outdoor-equivalent pace.
Do not mix them mid-session
If the watch is in km/h and the plan is in min/mile, convert once before you start. Mixing “I felt like 11 km/h then 5:20/km” is how people double-count effort. The printable pace chart prints both families on one grid.
Related Tools
Running Pace Converter
Convert between min/km, min/mi, km/h and mph, and see the implied finish time for 5K, 10K, half marathon and marathon.
KPH to MPH Converter (km/h to mph)
Convert kph to mph instantly: mph = km/h × 0.621371, so 100 km/h = 62.14 mph. Free km/h to miles per hour chart for road and running speeds, plus mph to km/h.
Running Pace Calculator
Enter distance and finish time to get your pace per km and mile, average speed and per-kilometre splits.
Treadmill Pace Calculator
Convert treadmill speed and incline to a flat outdoor pace of the same ACSM oxygen cost, or the belt setting that matches an outdoor pace.
Related guides
min/km ↔ min/mile
Convert min/km and min/mile with the international mile 1.609344 km. Why 5:00/km is 8:03/mi, not 8:00, and how a 400 m split becomes a pace.
What Is Running Pace?
Pace is time per kilometre or mile. How to calculate it, how it differs from speed, and how to convert min/km and min/mile with 1.609344.
Treadmill vs outdoor pace
Why 10 km/h on a treadmill is not automatically 6:00/km outdoors. Jones & Doust’s 1% same-speed rule versus Endurometry’s ACSM equal-VO₂ converter, with the same numbers the tool shows.
How the numbers are calculated
Speed and unit conversion · Pace, speed and distance · Rounding and displayed precision · Sources
Frequently Asked Questions
Is faster pace a higher or lower number?
Lower. 4:30/km is faster than 5:00/km. Speed goes the other way: 13 km/h is faster than 12 km/h.
Why 60 in the formula?
There are 60 minutes in an hour. 60 ÷ 5 min/km = 12 km in one hour.
Does 8:03/mi equal 5:00/km exactly?
5:00 × 1.609344 = 8.04672 min = 8:03 after display rounding. Internally they invert.
Which should my treadmill use?
Match the console. Convert to min/km if your outdoor plan is written that way. Grade is a separate conversion.
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Tell us which calculator, pace chart or fix would help — we build what runners ask for. Replies usually come back in 1–2 days.