KM/H to MPH Converter
Type km/h to get mph. 100 km/h, a common motorway limit, is about 62 mph.
100 km/h =
62.1371mph
100 kilometers per hour is 62.1371 miles per hour.
- 1 km/h
- 0.6214 mph
- 1 mph
- 1.6093 km/h
How this works: Method, 4 sources,
How this works
Method
Divide the kilometers per hour by 1.609344, or multiply by 0.621371, which is the same thing rounded. The divisor is exact because the mile is defined as 1,609.344 m; its reciprocal is an endless decimal, so 0.621371 is good to six figures. Full method
Sources
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Changes
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How to convert km/h to mph
Divide the kilometers per hour by 1.609344, or multiply by 0.621371, which is the same thing rounded. The divisor is exact because the mile is defined as 1,609.344 m; its reciprocal is an endless decimal, so 0.621371 is good to six figures.
A German Autobahn advisory speed of 130 km/h: 130 ÷ 1.609344 = 80.78 mph. A 50 km/h town limit, standard across much of Europe, comes to 31.07 mph, so it allows a touch more speed than the 30 mph limit in British towns.
Weather forecasts in Canada and Australia give wind speed in km/h, so the same division turns a 90 km/h gust into 55.92 mph.
miles per hour = kilometers per hour ÷ 1.609344 (≈ kilometers per hour × 0.621371)
- One kilometer per hour is 1,000 m in 3,600 s, or 0.2778 m/s; one mile per hour is exactly 0.44704 m/s. Source: NIST SP 811, Appendix B.9: conversion factors by quantity.
How to estimate km/h to mph in your head
Halve the number, then add a tenth of the original back on. 120 km/h: half is 60, a tenth is 12, total 72; the exact answer is 74.56, so you are about 3% under. For a closer figure, add about 2 for every hundred km/h: 72 + 2.4 = 74.4.
Memorise three pairs and interpolate: 50 km/h ≈ 31 mph, 100 km/h ≈ 62 mph, 160 km/h ≈ 99 mph. The last one is handy because 160 km/h is almost exactly 100 mph.
km/h to mph chart
Speedometer markings and metric speed limits, converted to miles per hour.
| Kilometers per hour (km/h) | Miles per hour (mph) |
|---|---|
| 10 | 6.2137 |
| 20 | 12.4274 |
| 30 | 18.6411 |
| 40 | 24.8548 |
| 50 | 31.0686 |
| 60 | 37.2823 |
| 70 | 43.496 |
| 80 | 49.7097 |
| 90 | 55.9234 |
| 100 | 62.1371 |
Show all 20 rowsShow fewer
| 110 | 68.3508 |
| 120 | 74.5645 |
| 130 | 80.7783 |
| 140 | 86.992 |
| 150 | 93.2057 |
| 160 | 99.4194 |
| 180 | 111.847 |
| 200 | 124.274 |
| 250 | 155.343 |
| 300 | 186.411 |
Frequently Asked Questions
What is 100 km/h in mph?
100 km/h is 62.14 mph. It is a common limit on highways in Canada and on rural roads in many European countries, and the standard benchmark for car acceleration times (0–100 km/h).
Is 0 to 100 km/h the same as 0 to 60 mph?
Not quite. 100 km/h is 62.14 mph, so a 0–100 km/h time is always a little slower than the same car’s 0–60 mph time. 60 mph is 96.56 km/h.
How do I convert pace in min/km to min/mile?
Pace is the inverse of speed, so multiply instead of divide: a 5:00 per kilometer pace is 5 × 1.609344 = 8.05 minutes, about 8:03 per mile.