mph to km/h
km/h = mph × 1.609344
Exact factor, derived from 1 mi = 1,609.344 m.
Convert km/h to mph (and mph to km/h)
Two-way km/h ↔ mph converter: exact factor (1 mph = 1.609344 km/h), formulas, a mental-math shortcut, a table of everyday speeds and real examples (European and Canadian speed limits, car speedometers, treadmill speeds).
Conversion table
| km/h | mph |
|---|---|
| 1 km/h | 0.6214 mph |
| 2 km/h | 1.24274 mph |
| 5 km/h | 3.10686 mph |
| 10 km/h | 6.21371 mph |
| 20 km/h | 12.4274 mph |
| 50 km/h | 31.0686 mph |
| 100 km/h | 62.1371 mph |
| 1,000 km/h | 621.371 mph |
| mph | km/h |
|---|---|
| 1 mph | 1.60934 km/h |
| 2 mph | 3.21869 km/h |
| 5 mph | 8.04672 km/h |
| 10 mph | 16.0934 km/h |
| 20 mph | 32.1869 km/h |
| 50 mph | 80.4672 km/h |
| 100 mph | 160.934 km/h |
| 1,000 mph | 1,609.34 km/h |
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How does this tool work?
This converter turns kilometers per hour (km/h, sometimes written kph) into miles per hour (mph) and back: type a speed in either field and the other updates instantly. It is handy when you drive in Canada, Mexico or Europe where limits are posted in km/h, when you read a European car review, or when you need to translate a treadmill or cycling speed between the two systems.
Miles per hour measures international miles traveled in one hour. Since the 1959 international yard and pound agreement, 1 mile = 1,609.344 m exactly, so 1 mph is exactly 1.609344 km/h and 1 km/h ≈ 0.621371 mph. The factor is the same as for distances because the hour is identical on both sides.
To go from km/h to mph, divide by 1.609344 (or multiply by 0.621371); to go from mph to km/h, multiply by 1.609344. For example, 100 km/h ÷ 1.609344 ≈ 62.14 mph and 65 mph × 1.609344 ≈ 104.61 km/h.
In your head, multiply km/h by 6 and divide by 10: 90 km/h ≈ 54 mph (exact 55.92). The other way, add 60% to the mph figure: 50 mph ≈ 80 km/h (exact 80.47). On a dual speedometer, 30, 50 and 70 mph sit close to 48, 80 and 113 km/h.
Do not mix up mph and knots: 1 knot is 1 nautical mile per hour, exactly 1.852 km/h or about 1.151 mph. Boat, aircraft and marine wind speeds are given in knots, not mph.
How to use this tool
Enter a speed
Type the value in the km/h field or the mph field; decimals are accepted.
Read the converted speed
The other field updates on every keystroke; round to a whole number for a speed limit, keep one decimal for a running or cycling speed.
Check the table
The double arrow swaps the direction, and the table below the converter lists the most common speed limits in both units.
km/h ↔ mph conversion formulas
Speed converts with the same factor as distance, since the hour is shared by both units.
km/h to mph
mph = km/h ÷ 1.609344 ≈ km/h × 0.621371
0.621371 is rounded to six decimals.
- v km/h
- speed in kilometers per hour
- v mph
- speed in international miles per hour
Example: 110 km/h = 110 ÷ 1.609344 ≈ 68.35 mph.
Use cases
Driving abroad
Translate posted limits in Canada, Mexico or Europe when your speedometer reads mph, or the reverse in a rental car.
Running and treadmills
Convert a treadmill setting in mph into km/h to follow a metric training plan, or vice versa.
Car specs and reviews
Compare top speeds and performance figures quoted in km/h by European manufacturers.
Sports and weather
Understand a serve speed, a pitch speed or a wind gust reported in km/h by international media.
Examples
Canadian highway
100 ÷ 1.609344 ≈ 62.14 mph, the usual limit on Canadian freeways.
Input
100 km/hResult
62.14 mphUS interstate
65 × 1.609344 ≈ 104.61 km/h, a common rural interstate limit.
Input
65 mphResult
104.61 km/hEuropean town center
50 ÷ 1.609344 ≈ 31.07 mph, the default urban limit in most of Europe.
Input
50 km/hResult
31.07 mphTreadmill run
6 × 1.609344 ≈ 9.66 km/h, which is a 10-minute mile or about 6:13 per kilometer.
Input
6 mphResult
9.66 km/hFrench autoroute
130 ÷ 1.609344 ≈ 80.78 mph, the dry-weather limit on French motorways.
Input
130 km/hResult
80.78 mphTips and best practices
- Quick anchors: 100 km/h ≈ 62 mph and 60 mph ≈ 97 km/h.
- A 0-60 mph time (to 96.56 km/h) is slightly shorter than a 0-100 km/h time, so the two figures are not directly comparable.
- At sea and in aviation, use the knots ↔ km/h converter: a knot is not an mph.
- To turn a speed into a pace (minutes per mile or per km), use a running pace calculator rather than a plain conversion.
- To double-check a result, convert it back: you should land on the starting speed.
Sources and references
Frequently asked questions
What is 100 km/h in mph?
100 km/h is about 62.14 mph (100 ÷ 1.609344).
What is 70 mph in km/h?
70 mph is 112.65 km/h (70 × 1.609344). It is the motorway limit in the United Kingdom.
How do I convert km/h to mph?
Divide by 1.609344 or multiply by 0.621371. For example, 80 km/h ≈ 49.71 mph and 120 km/h ≈ 74.56 mph.
How many km/h is 1 mph?
Exactly 1.609344 km/h, because one international mile has been 1,609.344 m since 1959.
Is a knot the same as an mph?
No. A knot is based on the nautical mile (1,852 m), the mph on the statute mile (1,609.344 m). 1 knot ≈ 1.151 mph ≈ 1.852 km/h.
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