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Free Speed Converter

Convert between km/h, mph, metres per second and knots.

Pick a speed and units for an instant conversion. It uses exact definitions: 1 mph = 0.44704 m/s and 1 knot = 1852 metres per hour.

How to use the Speed Converter

  1. Enter your values, choosing the units you are working in.
  2. Read the result and the supporting numbers shown beneath it.
  3. Check the result against a second method or a reference table before you rely on it.

About the Speed Converter

Convert between km/h, mph, metres per second and knots.

Quick, reliable engineering arithmetic saves time on site and in the workshop. These tools show their working so you can check the result.

Getting started with the Speed Converter

Using the speed converter takes a minute or two. Your entries are saved in this browser, so you can come back later and carry on.

Tips for better results

To estimate quickly, multiply km/h by 0.6 to get miles per hour, or use the exact factor for precision.

Keep units consistent from start to finish.

These tools are for estimates. Safety critical designs need a qualified engineer.

Privacy and where your data goes

Everything you type into the speed converter stays on your own device. Zapxa does not receive your numbers or documents. If you clear your browser data, your saved entries will be removed, so download a PDF of anything you want to keep.

Frequently asked questions

How many km/h is 1 mph?

1 mph is 1.609344 km/h.

What is a knot?

One nautical mile per hour, which is exactly 1.852 km/h.

Is the speed converter free?

Yes. It is free to use with no signup, no watermark and no usage limits.

Is my data private?

Yes. Your inputs are processed in your browser and saved only in its local storage. They are not uploaded to our servers.

Does it work on mobile?

Yes. Zapxa works on phones, tablets and desktops. Use the print button or download a PDF to keep a copy.

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