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Free Speed Converter – mph, km/h & More

Convert between km/h, mph, m/s, knots and Mach.

Speed Converter What is this? ↓
About the Speed Converter

What is the Speed Converter?

A speed converter changes a speed or velocity between metric, imperial, nautical and scientific units.

Why use this calculator?

Driving abroad, flying, sailing and studying physics all involve different speed conventions, so quick conversion is useful.

How to use it

  1. Enter the speed value.
  2. Choose the source and target units.
  3. Read the converted speed.

Formula

Every unit is defined relative to meters per second, the SI unit of speed.
Mach uses the speed of sound at sea level, about 340.29 m/s, and varies with temperature and altitude.
Frequently Asked Questions
How many km/h is 60 mph?
60 mph is about 96.6 km/h.
What is a knot?
A knot is one nautical mile per hour, about 1.852 km/h, used in aviation and shipping.
How precise are the conversions?
Conversions use standard, internationally defined factors and are rounded for display. They are accurate to the number of digits shown.
Can I convert back and forth without losing accuracy?
Yes. Enter the original value to get an exact inverse conversion; avoid chaining rounded results if you need maximum precision.
Which measurement system is used?
Both metric (SI) and US customary / imperial units are supported and clearly labelled.
Is this calculator free to use?
Yes. Every calculator on this site is completely free, with no hidden fees, no subscriptions and no limits on how many times you can use it.
How accurate are the results?
We use standard, widely accepted formulas and calculate in your browser using double-precision arithmetic. Results are rounded for readability, so treat them as reliable estimates rather than a guarantee. Real-world factors can vary the true figure.
Can I add this calculator to my own website?
Yes. Open this calculator page and use the "Add to your website" box in the sidebar to copy a ready-made iframe snippet, then paste it into any HTML page.
Does it work on a phone or tablet?
Yes. The layout is fully responsive, so it works on desktops, laptops, tablets and mobile phones, and every input adapts to touch screens.
Is the information I type kept private?
Yes. All calculations run locally in your browser. Nothing you enter is uploaded, stored or shared with anyone.

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