Speed Converter
Convert between kilometers per hour, miles per hour, meters per second and knots.
The Speed Converter is a free online tool that converts speed between kilometers per hour (km/h), miles per hour (mph), meters per second (m/s), and knots instantly. No sign-up needed — enter a value, choose your units, and get an accurate result.
What is a speed converter?
Speed is expressed differently around the world and across industries: road signs in the US show mph while most other countries use km/h, physics problems often use m/s, and maritime and aviation contexts use knots. This tool bridges all of them instantly for travel, science, sports, and navigation.
How to use the Speed Converter
- Enter the speed value you want to convert.
- Select the unit to convert from — km/h, mph, m/s, or knots.
- Click Calculate to see the equivalent across units.
Key features
- Supports km/h, mph, m/s and knots.
- Useful for travel, sports training, physics, and navigation.
- Instant, accurate two-way conversion.
- Free and works directly in your browser.
Related tools
Training or planning a trip? Try the Pace Converter, Length Converter, or the Time Converter.
Frequently asked questions
Is the Speed Converter free?
Yes, it's completely free with no sign-up required.
How do I convert mph to km/h?
Multiply the mph value by approximately 1.60934 to get km/h.
What is a knot?
A knot equals one nautical mile per hour, roughly 1.852 km/h, and is the standard speed unit in aviation and maritime navigation.
Why does physics use meters per second?
Meters per second is the SI unit for speed, making it consistent with other SI-based physics calculations like force and energy.
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