Speed Converter
Enter a speed, choose its unit and see it in miles per hour, kilometers per hour, meters per second, knots and feet per second at once. The page lists the exact factors, worked examples and a table of common speeds.
Last updated November 4, 2026
Result
60 mph = 96.5606 km/h = 26.8224 m/s
| Unit | Speed |
|---|---|
| Miles per hour | 60 mph |
| Kilometers per hour | 96.5606 km/h |
| Meters per second | 26.8224 m/s |
| Knots | 52.1386 kn |
| Feet per second | 88 ft/s |
Exact definitions: 1 mph = 0.44704 m/s, 1 knot = 1,852 / 3,600 m/s. Results are rounded to 4 decimal places.
Show the work
Formula: m/s = speed x m/s per unit; target = m/s / m/s per target unit
- Entered: 60 mph.
- Meters per second first: 1 mph = 0.44704 m/s, so 60 x 0.44704 = 26.8224 m/s.
- Kilometers per hour: 26.8224 m/s / 0.277777777778 (1 km/h = 0.277777777778 m/s) = 96.5606 km/h.
- Meters per second: 26.8224 m/s / 1 (1 m/s = 1 m/s) = 26.8224 m/s.
- Knots: 26.8224 m/s / 0.514444444444 (1 kn = 0.514444444444 m/s) = 52.1386 kn.
- Feet per second: 26.8224 m/s / 0.3048 (1 ft/s = 0.3048 m/s) = 88 ft/s.
Result: 60 mph = 96.5606 km/h = 26.8224 m/s
How speed units convert
1 mph = 0.44704 m/s · 1 km/h = 1 ÷ 3.6 m/s · 1 kn = 1,852 ÷ 3,600 m/s · 1 ft/s = 0.3048 m/s
A speed is a distance divided by a time, so every speed unit is a distance unit over a time unit. This converter holds every speed as meters per second. It multiplies your number by the meters per second in one of your unit, then divides by the meters per second in the unit you want, so any pair of the five units takes the same two steps.
The factors come from exact definitions. A mile is 1,609.344 meters and an hour is 3,600 seconds, so 1 mph is exactly 0.44704 m/s. A kilometer is 1,000 meters, so 1 km/h is 1,000 ÷ 3,600, which is 1 ÷ 3.6 m/s. A foot is exactly 0.3048 meters. A knot is one nautical mile per hour, and the nautical mile is defined as exactly 1,852 meters, so 1 knot is 1,852 ÷ 3,600 m/s, about 0.5144 m/s.
See how we calculate for the formulas, sources and review schedule behind every calculator.
Also useful alongside this calculator: Miles to Kilometers Calculator, Pace Calculator and MPG Calculator.
Miles per hour to kilometers per hour
Because 1 mile is exactly 1.609344 kilometers, multiply mph by 1.609344 to get km/h and divide km/h by 1.609344 to get mph. A 65 mph highway limit is 65 × 1.609344 ≈ 104.61 km/h, and a 100 km/h limit is about 62.14 mph.
For a quick mental estimate, multiply mph by 1.6 or divide km/h by 1.6. The estimate drifts on large values, so use the exact factor when it matters.
Meters per second and the factor 3.6
Meters per second is the standard SI unit and the one used in physics. To change m/s into km/h, multiply by 3.6, because an hour holds 3,600 seconds and a kilometer holds 1,000 meters. To go back, divide by 3.6. A speed of 10 m/s is exactly 36 km/h, and 1 m/s is about 2.2369 mph.
Feet per second works the same way. Since 1 mph is exactly 88 ft per 60 seconds, 60 mph equals exactly 88 ft/s, a handy check for any answer.
Knots at sea and in the air
Ships and aircraft report speed in knots, where one knot is one nautical mile per hour. A nautical mile is 1,852 meters, so a knot is exactly 1.852 km/h and about 1.1508 mph. A boat making 20 knots covers 37.04 km every hour, or about 23.02 mph.
The knot is a speed, not a distance, so the phrase knots per hour is a common mistake. Saying a vessel does 20 knots already includes the per-hour part.
Which unit suits which job
Road signs use mph in the United States and km/h in most other countries. Weather reports for wind often use mph, km/h, m/s or knots depending on the country and the audience. Runners and cyclists may use km/h, while engineers and scientists usually work in m/s.
When you compare speeds from different sources, convert them all to one unit first. Reading 90 mph beside 140 km/h hides the fact that 90 mph is about 144.8 km/h, so the km/h figure is the slower one.
Precision and rounding
The factors are exact by definition, so the only rounding comes from showing the result. This converter shows up to 4 decimal places and trims trailing zeros. Real speedometers and anemometers are accurate to a unit or so, which is far coarser than the converter. Round your final answer, not the steps in between.
How to use the Speed Converter
- Enter the speed as a number of 0 or more.
- Choose its unit: mph, km/h, m/s, knots or ft/s.
- Read the speed in all five units, then use Copy, Print or Share.
Worked example
To convert 60 mph, multiply by 0.44704 to get 26.8224 m/s. Divide by 1 ÷ 3.6 (that is, multiply by 3.6) to get 96.56064 km/h, divide by 0.3048 to get exactly 88 ft/s, and divide by 0.5144 (1,852 ÷ 3,600) to get about 52.1386 knots. Starting from 100 km/h instead gives 27.7778 m/s and 62.1371 mph, so the two directions agree.
| Speed | mph | km/h | m/s | knots | ft/s |
|---|---|---|---|---|---|
| 1 mph | 1 | 1.6093 | 0.447 | 0.869 | 1.4667 |
| 60 mph | 60 | 96.5606 | 26.8224 | 52.1386 | 88 |
| 100 km/h | 62.1371 | 100 | 27.7778 | 53.9957 | 91.1344 |
| 10 m/s | 22.3694 | 36 | 10 | 19.4384 | 32.8084 |
| 20 knots | 23.0156 | 37.04 | 10.2889 | 20 | 33.7562 |
Frequently asked questions
How many km/h is 1 mph?
Exactly 1.609344 km/h, because a mile is defined as 1,609.344 meters. That is also 0.44704 meters per second.
How do I convert m/s to km/h quickly?
Multiply by 3.6. An hour has 3,600 seconds and a kilometer has 1,000 meters, so 10 m/s is exactly 36 km/h.
How fast is one knot in mph and km/h?
One knot is exactly 1.852 km/h, which is about 1.1508 mph. It equals one nautical mile per hour.
Does the converter handle Mach numbers?
No. Mach depends on air temperature and altitude, so it is not a fixed factor. This tool covers only the five fixed units shown.
Can I convert a negative speed?
No. The converter takes a speed of 0 or more and shows an error for negative values instead of a result.