km/h to mph
Type kilometers per hour (km/h), see miles per hour (mph).
By Akash Yadav Updated 25 October 2026
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The formula
How to convert km/h to mph
To change km/h into mph, multiply by 0.621371192237.
mph = km/h × 0.621371192237
Going the other way: km/h = mph × 1.609344
1 kilometer per hour = 0.62137119 mph. This factor does not end, so results on this page are rounded.
Worked example
You have 100 km/h. Multiply by 0.621371192237. 100 × 0.621371192237 = 62.1371 mph.
Common values
Km/h to mph conversion table
| Km/h (km/h) | Mph (mph) |
|---|---|
| 10 km/h | 6.2137 mph |
| 20 km/h | 12.4274 mph |
| 30 km/h | 18.6411 mph |
| 40 km/h | 24.8548 mph |
| 50 km/h | 31.0686 mph |
| 60 km/h | 37.2823 mph |
| 70 km/h | 43.496 mph |
| 80 km/h | 49.7097 mph |
| 90 km/h | 55.9234 mph |
| 100 km/h | 62.1371 mph |
| 110 km/h | 68.3508 mph |
| 120 km/h | 74.5645 mph |
| 130 km/h | 80.7783 mph |
| 150 km/h | 93.2057 mph |
Before you rely on it
Speed limits are not converted, they are set
A 100 km/h limit works out at about 62 mph, but no country posts 62. Limits are chosen as round numbers in whichever unit the country uses, so a converted limit tells you how fast you may go, not what the sign will say.
The two conversions worth memorising for driving: 100 km/h is roughly 60 mph, and 50 km/h is roughly 30 mph. Both are a little under the true figure, which is the safe direction to be wrong in.
A car speedometer is deliberately optimistic. Regulations in most countries allow it to read high but never low, so a converted reading may still not match your true ground speed.
Knots are a third unit again, used at sea and in the air: 1 knot is one nautical mile per hour, or 1.852 km/h exactly. A knot is not a "nautical km/h" and is never interchangeable with mph.
Common questions
Frequently asked questions
How many mph is 100 km/h?
100 km/h is about 62.1 mph.
How many mph is 50 km/h?
50 km/h is about 31.1 mph — the common urban limit in metric countries.
How many mph is 30 km/h?
30 km/h is about 18.6 mph.
Is 120 km/h faster than 70 mph?
Yes, slightly. 120 km/h is about 74.6 mph.
What is the quick way to estimate km/h in mph?
Halve it, then add a tenth of the original. For 100 km/h: 50 plus 10 is 60, against a true 62.1 mph. Good enough to read a foreign speed limit at a glance.
How many mph is 80 km/h?
80 km/h is about 49.7 mph — a common limit on country roads outside the US and UK.
How many mph is 110 km/h?
110 km/h is about 68.4 mph.
How many mph is 150 km/h?
150 km/h is about 93.2 mph.
Keep going
Related converters
- mph to km/h mph → km/h
- Kilometers to Miles km → mi
- km/h to m/s km/h → m/s
- Knots to km/h kn → km/h
- All speed converters
Read next
Guides that cover this conversion
Every factor on this page is listed in our conversion methodology.