How to Convert Speed Units
Speed conversions are a daily need for travelers and drivers. Speed limits in the US and UK are posted in miles per hour, while most of the world uses kilometers per hour. Aviation and sailing use knots, and physics uses meters per second. One mph equals exactly 1.609344 km/h, and one knot equals exactly 1.852 km/h.
Common Speed Conversion Factors
| Conversion | Result |
|---|---|
| 1 mph | 1.60934 km/h |
| 100 km/h | 62.1371 mph |
| 1 knot | 1.15078 mph (1.852 km/h) |
| 1 m/s | 3.6 km/h (2.23694 mph) |
| 60 mph | 96.56 km/h |
Quick mental math: to convert km/h to mph, multiply by 0.6. To convert mph to km/h, multiply by 1.6.
Frequently Asked Questions
How fast is 100 km/h in mph?
100 km/h equals 62.137 mph, a common highway speed limit.
What is a knot?
A knot is one nautical mile per hour, equal to 1.852 km/h or 1.15078 mph. It is used in aviation and sailing.
How do I convert m/s to km/h?
Multiply by 3.6. For example, 10 m/s equals 36 km/h.
Also try the length converter, area converter or data converter.