Speed Converter

Convert between mph, km/h, m/s, knots, and ft/s speed units with instant accurate results.

Speed Converter tool

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Example

Input: 60 miles per hour (mph) to kilometers per hour (km/h)

Result: 96.56064 km/h

One mile is exactly 1.609344 km, so 60 x 1.609344 = 96.56064 km/h.

Common Speeds in Every Unit

Speedkm/hmphm/sknots
1 m/s3.62.2411.94
30 mph48.283013.4126.07
50 km/h5031.0713.8927
60 mph96.566026.8252.14
70 mph112.657031.2960.83
100 km/h10062.1427.7854
120 km/h12074.5633.3364.79
10 knots18.5211.515.1410
Speed of sound, 343 m/s1,234.8767.27343666.74

Values from this converter, rounded to 2 decimal places.

  1. Pick the speed unit you are starting with (mph, km/h, m/s, knots, or ft/s).
  2. Type in the speed value you want to convert.
  3. Equivalent values in the other four supported speed units appear instantly.
  4. Compare results side by side to understand the relationship between speed units.
  5. Click copy on any result to use the converted speed value elsewhere.

Converting mph, km/h, Knots and m/s

To convert mph to km/h, multiply by 1.609344, so 60 mph is 96.56 km/h. To go the other way, multiply km/h by 0.621371. This converter handles miles per hour, kilometers per hour, meters per second, knots and feet per second, and lists all five at once.

Each unit has its own home. Road signs use km/h in most countries and mph in the US and UK. Physics and engineering use meters per second. Sailors, pilots and marine forecasts use knots. Feet per second turns up in sports science and older engineering specs.

The handiest exact rule is for m/s and km/h: multiply m/s by 3.6. A sprinter running 10 m/s is moving at 36 km/h. For driving abroad, remember that 100 km/h is about 62 mph and 50 km/h is about 31 mph.

Two mistakes come up often. A knot is already a speed, one nautical mile per hour, so there is no such thing as "knots per hour". And running pace, such as 5 minutes per kilometer, is the inverse of a speed. You cannot enter it here directly. The Pace Calculator handles pace, and the ETA Calculator tells you how long a trip takes at a given speed.

Formula / How It Works

1 m/s = 3.6 km/h = 2.23694 mph = 1.94384 knots = 3.28084 ft/s

Sources

Frequently Asked Questions

Multiply miles per hour by 1.609344. So 60 mph is 96.56 km/h, and 70 mph is 112.65 km/h. For a quick estimate, multiply by 1.6. To go from km/h to mph, multiply by 0.621371, or by 0.6 for a rough answer.
Close, but not quite. 100 km/h is 62.14 mph, and 60 mph is 96.56 km/h. Many people treat them as the same speed for driving, which is fine for a rough idea. When a speed limit matters, use the exact value, since the gap grows at higher speeds.
Multiply by 3.6. An hour has 3,600 seconds and a kilometer has 1,000 meters, and 3,600 / 1,000 = 3.6. So 10 m/s is 36 km/h. To go from km/h to m/s, divide by 3.6, which turns 90 km/h into 25 m/s.
A knot is one nautical mile per hour. That is exactly 1.852 km/h, or about 1.15 mph. Ships, aircraft and marine weather reports use it. A 20-knot wind is about 23 mph or 37 km/h. Knots already include time, so "knots per hour" is not a speed.
In dry air at 20 C, sound travels at about 343 m/s. That is 1,234.8 km/h, 767 mph or 667 knots. This speed is called Mach 1. It is not fixed, because sound moves more slowly in colder air, so aircraft at high altitude reach Mach 1 at a lower speed.

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