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Speed converter
Speed converter: convert between km/h, mph, m/s and knots online, free and without signing up. Pick the From and To units, type a value and read the result as you type. Nothing is uploaded: the maths runs in your browser.
How to convert speed units online
- 1Type the number you want to convert
- 2Pick the From and To units
- 3Read the result, or look it up in the table
- The value in your unit, plus every other unit.
What happens to your numbers
- Nothing is uploaded.The sum is done by your browser. The number you type never leaves your device.
- Exact definitions.1 mph is 0.44704 m/s, and 1 knot is 1852 meters per hour.
- Works offline.Once the tool has been opened, it needs no connection.
What you can do
- Convert between all 4 units, with decimals and negative numbers. The result changes as you type.
- Example: 100 km/h = 62.1371 mph.
- Press Swap to turn the conversion around without retyping the number.
- The table lists the value in every unit except the From unit, so one entry gives you 3 results.
- Compare road speeds, wind and weather figures, or ship and aircraft speeds across km/h, mph, m/s and knots.
Good to know
- The page opens with km/h as the From unit, mph as the To unit and a value of 1. Change either unit at any time.
- Results show up to 10 significant digits. Very large or very small values appear in exponent form, such as 1.500000e-7.
- Speed limits are given in km/h in most countries and in mph in the US and UK. A limit of 100 km/h is about 62 mph.
Questions
Is this speed converter free?
Yes. It is free and needs no account or sign-up. Nothing you type is uploaded.
How exact is the result?
The factors are exact: 1 mph is 0.44704 m/s, 1 km/h is 1/3.6 m/s and 1 knot is 1852/3600 m/s. The result shows up to 10 significant digits.
How fast is a knot?
A knot is one nautical mile (1,852 meters) per hour, or 1.852 km/h. It is used for ships, aircraft and wind speeds.
Which units can I convert?
km/h, mph, m/s and knots. Pick any two of them.