Speed Converter
Convert between common speed units. All conversions update simultaneously as you type.
All Conversions
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Miles per hour (mph)
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Kilometers per hour (km/h)
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Meters per second (m/s)
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Knots (kn)
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Feet per second (ft/s)
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How to Use the Speed Converter
- Enter a value in the input field.
- Select the source unit from the dropdown.
- View all conversions — every unit updates instantly.
- Copy all results with the Copy All button.
Common Speed Conversions
| From | To | Multiply By |
|---|---|---|
| 1 mph | km/h | 1.60934 |
| 1 km/h | mph | 0.621371 |
| 1 m/s | km/h | 3.6 |
| 1 knot | mph | 1.15078 |
| 1 knot | km/h | 1.852 |
| 1 mph | ft/s | 1.46667 |
Speed Reference Points
| Description | mph | km/h | m/s |
|---|---|---|---|
| Walking speed | 3.1 | 5.0 | 1.4 |
| Cycling speed | 12.4 | 20.0 | 5.6 |
| City speed limit | 30.0 | 48.3 | 13.4 |
| Highway speed | 65.0 | 104.6 | 29.1 |
| Speed of sound | 767.3 | 1,235.0 | 343.0 |
Frequently Asked Questions
How do I convert mph to km/h?
Multiply miles per hour by 1.60934 to get kilometers per hour. For a quick approximation, multiply by 1.6. For example, 60 mph is about 96.6 km/h.
What is a knot?
A knot is a unit of speed equal to one nautical mile per hour (1.852 km/h or 1.15078 mph). It is used primarily in maritime and aviation navigation.
What is the speed of light?
The speed of light in a vacuum is approximately 299,792,458 meters per second (about 670,616,629 mph or 1,079,252,849 km/h). It is the universal speed limit in physics.