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Speed converter
Convert km/h, mph, m/s, knots and Mach, with a table of common speeds.
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About Speed converter
Convert between km/h, mph, metres per second, knots and Mach. A knot is one nautical mile per hour, about 1.852 km/h, and is used at sea and in the air. Mach 1 is the speed of sound, around 1235 km/h at sea level and 15 C.
How to use Speed converter
- Enter a speed and choose its unit.
- Pick the unit you want, such as knots or m/s.
- Read the converted speed and the table of common speeds.
Why use this tool?
- Private: everything happens in your browser. Nothing you enter is uploaded.
- Free, with no sign-up, no watermark and no limit on how often you use it.
- Works on phones, tablets and computers: Android, iPhone, Windows, Mac and Linux. Nothing to install.
- Free to embed on your own website, with a ready-made code to copy.
- Available in 10 languages.
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Frequently asked questions
How fast is one knot in km/h?
1.852 km/h, since a nautical mile is exactly 1852 metres.
What is Mach?
Mach is a multiple of the speed of sound, which changes with air temperature and altitude. The tool uses a standard value, so it is a good approximation.
How do I convert m/s to km/h?
Multiply by 3.6. For example, 10 m/s equals 36 km/h. To go back, divide km/h by 3.6.
Is Speed converter free?
Yes. Speed converter on Toolipedia is free to use, with no sign-up and no watermark.
Is it safe to use?
Yes. Everything is worked out in your browser, and nothing you enter is sent to our server.
Does it work on my phone?
Yes. It works in any modern browser on Android and iPhone, as well as on tablets and computers. There's nothing to install.
Do I need an account?
No. Just open the page and use the tool. There's no sign-up and no email needed.
Can I put Speed converter on my own website?
Yes. Use the Embed on your site button under the tool to copy a short piece of code and paste it into your page. It is free, needs no account, and the tool keeps working inside your page.