Instantly convert mph, km/h, m/s, and knots — with real-world context
Speed Converter
| Speed | mph | km/h | m/s | knots |
|---|---|---|---|---|
| Average walking pace | 3.13171 | 5.04 | 1.4 | 2.72138 |
| City speed limit (50 km/h) | 31.0688 | 50.0004 | 13.889 | 26.9981 |
| Highway speed limit (100 km/h) | 62.1376 | 100.001 | 27.778 | 53.9962 |
| Commercial airliner cruise | 559.234 | 900 | 250 | 485.962 |
| Speed of sound (at sea level) | 767.269 | 1234.8 | 343 | 666.739 |
Click any row to load that speed into the converter.
Need to convert speed units fast? Our free speed converter handles mph, km/h, m/s, and knots all at once — just type a value, pick your source unit, and every conversion updates instantly. Whether you're a student, engineer, sailor, or traveller, you'll also get helpful real-world context comparing your speed to familiar benchmarks like walking pace or highway limits.
Multiply your mph value by 1.60934. For example, 60 mph equals approximately 96.56 km/h. Our converter does this automatically — just type 60, choose mph, and read off the km/h result.
One knot equals exactly 1.15078 mph, or about 1.852 km/h. Knots are nautical miles per hour and are the standard speed unit in aviation and maritime navigation.
100 km/h equals approximately 27.78 m/s. You can divide any km/h value by 3.6 to get metres per second.
Different fields and regions adopted their own conventions. The US and UK use mph for road speeds; most of the world uses km/h; scientists use m/s (SI base unit); and pilots and sailors use knots based on nautical miles, which simplify navigation calculations on spherical charts.