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Miles per hour and kilometres per hour are the two common units of speed, split along the imperial/metric line. Speed limits, car speedometers and race paces cross between them, so this converter turns mph into km/h and back with a fixed factor.
mph to km/h Converter: step-by-step worked example
What is a 70 mph US highway speed limit in km/h?
- Value
- 70
- Direction
- mph → km/h
- 1
Conversion factor (definition)
1 mile = 1.609344 km (exact) → 1 mph = 1.609344 km/h
1 mph = 1.609344 km/h = 1.6093 km/h
- 2
Inverse factor
1 km/h = 1 ÷ 1.609344 mph
1 ÷ 1.609344 = 0.6214 mph
- 3
Conversion
mph → km/h: × 1.609344 · km/h → mph: ÷ 1.609344
70 mph × 1.609344 = 112.6541 km/h
- 4
Check (reverse direction)
Convert the result back with the inverse operation
112.6541 km/h ÷ 1.609344 = 70 mph
- mph70
- km/h112.6541
- m/s31.2928
- kn60.8283
Good to know: Quick estimate: mph × 1.6 ≈ km/h. A 120 km/h motorway limit, common in Europe, is ≈ 74.6 mph.
mph to km/h Converter — how it works
The conversion factor
1 mph = 1.609344 km/h (and 1 km/h = 0.621371 mph).
| To convert | Do this |
|---|---|
| mph → km/h | multiply by 1.609344 |
| km/h → mph | divide by 1.609344 |
Common values
| mph | km/h |
|---|---|
| 30 mph | 48.28 km/h |
| 60 mph | 96.56 km/h |
| 70 mph | 112.65 km/h |
| 100 mph | 160.93 km/h |
Worked example
A 70 mph motorway limit is 70 × 1.609344 = 112.7 km/h. Going the other way, a 50 km/h urban limit is 50 ÷ 1.609344 = 31.1 mph. The two scales share the same factor as the distance conversion, since speed is just distance over time.
mph to km/h table
| mph | km/h |
|---|---|
| 10 | 16.1 |
| 20 | 32.2 |
| 30 | 48.3 |
| 40 | 64.4 |
| 50 | 80.5 |
| 55 | 88.5 |
| 60 | 96.6 |
| 65 | 104.6 |
| 70 | 112.7 |
| 75 | 120.7 |
| 80 | 128.7 |
| 100 | 160.9 |
km/h to mph table
| km/h | mph |
|---|---|
| 30 | 18.6 |
| 50 | 31.1 |
| 70 | 43.5 |
| 80 | 49.7 |
| 90 | 55.9 |
| 100 | 62.1 |
| 110 | 68.4 |
| 120 | 74.6 |
| 130 | 80.8 |
| 140 | 87 |
Frequently asked questions
How do I convert mph to km/h?+
Multiply the mph value by 1.609344. For example, 60 mph × 1.609344 = 96.56 km/h. A quick estimate is to multiply by 1.6.
How do I convert km/h to mph?+
Divide the km/h value by 1.609344, or multiply by 0.621371. So 100 km/h ÷ 1.609344 = 62.14 mph.
What is 60 mph in km/h?+
60 mph is 96.56 km/h. It’s a common highway speed, just under 100 km/h.
Is the conversion factor the same as miles to kilometres?+
Yes. Speed is distance divided by time, and the time unit (hours) is the same on both sides, so the mph-to-km/h factor is identical to the mile-to-kilometre factor: 1.609344.
What is 100 km/h in mph?+
100 km/h is about 62.14 mph — a touch over 62 mph, a typical open-road speed in metric countries.
About this page
- Publisher:
- Kalkoro — Teknolojig Bilişim Teknolojileri A.Ş., İstanbul
- Written by:
- Ahmet Tur — Editor (Math, date & time, unit conversion, physics & chemistry, everyday tools)
- Reviewed by:
- Kübra Yıldız — Editor
Parameters come from official sources; the last update date is shown at the bottom of the page.
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Results are for information only. For official matters the relevant authority's calculation prevails.
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