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Speed Converter
Sign up to favourite this calculatorConvert speed between mph, km/h, m/s and knots. Enter a value, choose the starting unit and select the unit you need.
Kilometres per hour (km/h)
Equivalent in metres per second
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Assumptions and limits
- An estimate from the numbers you entered, for guidance only. It is not financial, tax or medical advice.
- Calculator version 1, last updated 25 October 2026.
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How to use this calculator
- Enter the speed you want to convert.
- Select the unit the speed is currently measured in.
- Choose the unit you want to convert it to.
- The converted speed updates automatically as you type or change either unit.
Every option shows the name and the symbol, so Miles per hour (mph) and Metres per second (m/s) are never mixed up. The read-out under the inputs shows each selected unit's exact size in metres per second, and Max decimal places keeps every significant digit for a small conversion.
What do I enter to convert a speed?
- Enter speed — the number to convert, from 0 to 1,000,000,000. It starts at 60.
- From — the unit your speed is in: mph, km/h, m/s, knots, ft/s or ft/min. It starts at miles per hour.
- To — the unit you want the answer in, from the same six. It starts at kilometres per hour.
- Decimal places — 2, 4, 6 or Max. It rounds the displayed answer only; Max keeps every significant digit, up to 12 decimal places.
What do the results show?
- Converted speed — the main figure, labelled with the unit you chose. A very small result shows as “Less than …” or in scientific notation, never a bare 0.
- Equivalent in metres per second — your original speed in m/s. When either unit is already m/s it shows the equivalent in kilometres per hour instead.
- Unit sizes — one line per selected unit giving its exact size in metres per second.
How speed conversion works
The calculator first converts your selected speed into metres per second, then converts that value into your chosen unit.
speed in m/s = input value × source-unit multiplier
converted speed = speed in m/s ÷ destination-unit multiplier
- 1 mph = 0.44704 m/s
- 1 km/h = 0.277778… m/s (exactly 1 ÷ 3.6)
- 1 knot = 0.514444… m/s (one nautical mile per hour)
Example: convert 60 mph to km/h
- 60 × 0.44704 = 26.8224 m/s
- 26.8224 ÷ (1 ÷ 3.6) = 96.56064 km/h
That is the same as multiplying by 1.609344 directly: 60 mph × 1.609344 = 96.56064 km/h.
Common speed conversions
| Miles per hour | Kilometres per hour | Metres per second | Knots |
|---|---|---|---|
| 1 mph | 1.61 km/h | 0.45 m/s | 0.87 kn |
| 10 mph | 16.09 km/h | 4.47 m/s | 8.69 kn |
| 20 mph | 32.19 km/h | 8.94 m/s | 17.38 kn |
| 30 mph | 48.28 km/h | 13.41 m/s | 26.07 kn |
| 40 mph | 64.37 km/h | 17.88 m/s | 34.76 kn |
| 50 mph | 80.47 km/h | 22.35 m/s | 43.45 kn |
| 60 mph | 96.56 km/h | 26.82 m/s | 52.14 kn |
| 70 mph | 112.65 km/h | 31.29 m/s | 60.83 kn |
Values in this table are rounded for readability. The calculator uses full conversion precision.
Useful speed conversion facts
| Conversion | Equivalent |
|---|---|
| 1 mph | 1.609344 km/h |
| 1 mph | 0.44704 m/s |
| 1 km/h | 0.621371 mph |
| 1 m/s | 3.6 km/h |
| 1 knot | 1.852 km/h |
| 1 knot | approximately 1.15078 mph |
| 1 knot | approximately 0.514444 m/s |
| 1 ft/s | 0.3048 m/s |
What is a knot?
A knot is one nautical mile per hour, used for the speed of ships and aircraft. One nautical mile is 1,852 metres, so a knot is 1.852 km/h, about 1.15078 mph or 0.514444 m/s. Wind speed in marine and aviation forecasts is usually given in knots for the same reason.
Frequently asked questions
How do I convert mph to km/h?
Multiply miles per hour by 1.609344. km/h = mph × 1.609344. For example, 60 mph equals 96.56064 km/h.
How do I convert km/h to mph?
Divide kilometres per hour by 1.609344. mph = km/h ÷ 1.609344. For example, 100 km/h is approximately 62.14 mph.
How many mph is one knot?
One knot is approximately 1.15078 mph. A knot is equal to one nautical mile per hour.
How fast is 1 m/s in km/h?
One metre per second is exactly 3.6 km/h.
What is 70 mph in km/h?
70 mph is approximately 112.65 km/h.
Is speed the same as velocity?
In everyday language, speed and velocity are often used interchangeably. In physics, speed describes how fast something moves, while velocity includes both speed and direction.
Last updated 25 October 2026.