Convert km/h, m/s, mph and knots

Drivers, navigators and athletes use it to compare a speed in km/h, m/s, mph or knots before a trip or performance review.

Convert km/h, m/s, mph and knots. The entire operation stays in your browser, and the values you enter are never sent to a server, shared, or stored.

How to use

  1. Enter the numeric value you want to convert in the first field.
  2. Choose the source unit from m/s, km/h, mph, knot or ft/s.
  3. Select the target unit you want to compare against.
  4. Run the conversion to display the equivalent speed.
  5. Check the displayed unit, then clear the fields before starting another calculation.

Example

A navigator records a speed of 100 km/h and wants to compare it in miles per hour before sharing the information. They enter the value, choose km/h as the source unit and mph as the target unit, then read the result with its unit.

Input

100
km/h
mph

Output

100 km/h = 62.1371192237 mph

Limits and formats

Where processing happens

The conversion is performed in your browser. The value and selected units stay on your device and are neither transmitted nor stored.

Frequently asked questions

Which units are available?

The tool covers metres per second, kilometres per hour, miles per hour, knots and feet per second. Select the source unit and then the target unit before running the conversion.

Can I convert a negative value?

A negative speed may be accepted as a number, but it does not always make physical sense in context. Check what the value represents before interpreting the output.

Why does the displayed result look rounded?

The display may limit decimal places to keep the value readable. If you need more precision, note the shown value and repeat the calculation with a method suited to that requirement.

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