Speed Converter
Convert between speed units.
Convert between speed units.
This free Speed Converter from KX Toolkit is part of our all-in-one online toolkit. It runs entirely in your browser, so your data never leaves your device for client-side operations. 100% free, forever - no paywall, no credit card, no trial.
How to use the Speed Converter
- Pick the unit you have and the unit you want.
- Enter the value.
- Read the converted value - most tools update as you type.
- Use the swap button to reverse the direction if needed.
What you can do with the Speed Converter
- Convert recipe ingredients between metric and imperial.
- Translate engineering specs across systems.
- Check shipping weights and dimensions before ordering.
- Quick travel conversions for distance, speed and currency.
Why use KX Toolkit's Speed Converter
- Browser-based: Works on Windows, macOS, Linux, iOS and Android - no install, no extension.
- Privacy-first: Client-side tools never upload your data; server-side tools delete files right after processing.
- Mobile-friendly: Full feature parity on phones and tablets - not a stripped-down view.
- Fast: Optimised for instant feedback. No artificial waiting screens, no email-gated downloads.
- One hub for everything: 300+ tools across SEO, text, image, PDF, code, color, calculators and more - skip switching between sites.
Tips for the best results
For very large or very small numbers, use the scientific-notation option - it avoids floating-point rounding errors.
Related Unit Converter Tools
If you find this tool useful, explore the full Unit Converter Tools collection or browse our complete tool directory. KX Toolkit is built for marketers, developers, designers, students and anyone who needs a quick utility without signing up for yet another SaaS.
How do I convert km/h to mph?
Divide km/h by 1.60934 to get mph, or multiply mph by 1.60934 to get km/h. So 100 km/h is about 62.1 mph, and 60 mph is about 96.6 km/h. The factor comes from the definition that 1 mile equals 1.609344 km. This is the most common speed conversion when driving between Canada and the US or reading European car specs in the UK.
What is a knot and where is it used?
A knot is one nautical mile per hour, which equals 1.852 km/h or about 1.151 mph. Knots are the standard for ships and aircraft because they relate directly to lines of latitude on a chart. A typical commercial jet cruises at 450-500 knots, and a container ship sails at 20-25 knots. The converter handles knots together with land-based speed units.
How fast is the speed of sound?
In dry air at 20 C the speed of sound is about 343 m/s, or 1,235 km/h, or 767 mph, or 667 knots. This is Mach 1. Mach numbers are ratios to the local speed of sound, which itself depends on temperature and altitude. Aircraft tools often quote Mach values, and you can use the converter to translate them into more familiar units.
How do I convert metres per second to kilometres per hour?
Multiply m/s by 3.6 to get km/h. So 10 m/s equals 36 km/h, and 30 m/s equals 108 km/h. The factor comes from 3,600 seconds per hour divided by 1,000 metres per kilometre. This is handy for converting wind speeds reported by weather stations (often in m/s) into the km/h or mph format used on car dashboards.
What speed limits are common worldwide?
Most countries post limits in km/h, with motorways at 100-130 km/h and city streets at 30-50 km/h. The US, UK, and a few others use mph, with US highways typically 55-75 mph and UK motorways at 70 mph. The converter helps drivers translate signs when crossing borders or watching foreign motoring videos.
Does the converter handle very high speeds?
Yes. It covers everyday units (m/s, km/h, mph, knots, ft/s) and also Mach numbers and a fraction of the speed of light if needed for physics work. The speed of light in vacuum is 299,792,458 m/s, which is about 1.08 billion km/h. Most users will only need terrestrial units, but the wider range is there for science and aerospace.
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