Speed Converter

Change mph to km/h, meters per second, feet per second, or knots as you type.

✓ Free to use · Runs in your browser · No sign-up

Enter a value. Your answer appears below.

Choose the unit you have in “From” and the unit you need in “To”. No calculate button needed.

Speed tells you how far something travels in a unit of time. One knot is one international nautical mile (1,852 meters) per hour.

Numbers only. For example, 12.5 or 1e6 (one million).
Updates automatically
Select this number to copy it manually, or use Copy result below.

Start with a number above, or try the example below.

Example: 1 mile per hour = 1.609344 kilometers per hour. Results show up to 15 significant digits. Very large or small answers may use e notation: 1e6 means 1,000,000. Numbers are processed only in this browser.

How to use Speed Converter

  1. Enter the speed reading as a number.
  2. Select its current unit, then choose the unit you want to compare.
  3. Read the live result or swap directions to check the converted speed.

A closer look

Speed combines distance and time. The converter compares units through meters per second, accounting for 3,600 seconds in an hour. This makes 1 m/s exactly 3.6 km/h and 1 mph exactly 1.609344 km/h. A knot is one international nautical mile per hour, equivalent to 1.852 km/h. These conversions do not account for acceleration or calculate a journey’s duration.

A practical example

A speed of 1 meter per second is 3.6 kilometers per hour. Converting units changes how a speed is expressed; it does not calculate travel time.

A useful tip

A negative value can represent signed velocity in a chosen direction. Its sign is preserved; the converter does not infer a direction or a route.

Good questions. Simple answers.

Are knots the same as miles per hour?

No. Knots use nautical miles of 1,852 meters, while mph uses miles of 1,609.344 meters.

Can I convert minutes per kilometer?

That is pace, the inverse of speed. Pace is not one of the supported units in this converter.

Explore all converters for related tasks and category-specific guidance, or read how Toolzafi handles your data.

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