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Speed Converter
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// about this tool

Speed Converter Online

Updated 2026-10-24

Convert speed online for free between miles per hour, kilometres per hour, metres per second, feet per second, and knots. Enter a value, pick the units, and SnapTools shows the result instantly. Everything runs in your browser, so nothing you enter is uploaded.

Speed shows up in different units depending on the domain: road signs in mph or km/h, physics in metres per second, navigation in knots. This converter moves between all of them in any direction using the exact defining factors, so whether you are checking a foreign speed limit or solving a physics problem, the answer is accurate.

// how to use

  1. 1 Enter a speed value in the input panel.
  2. 2 Choose the unit you're converting from and the unit you're converting to.
  3. 3 Read the converted value on the right, then copy it.

// examples

mph to km/h
Input
60 mph → km/h
Output
96.56064 km/h
km/h to m/s
Input
100 km/h → m/s
Output
27.777778 m/s
Knots to km/h
Input
10 kn → km/h
Output
18.52 km/h

// common uses

Converting vehicle speeds between mph and km/h Aviation and marine speeds in knots Physics problems using metres per second Comparing speed limits when travelling abroad

// faq

Why is nautical speed measured in knots?
Sailors once measured speed with a rope tied in evenly spaced knots and a wooden float, called a chip log. They tossed it overboard and counted how many knots ran out while a sand-glass timed a fixed interval, and the count gave the speed of the ship in nautical miles per hour, which is why the unit is still called a knot.
Which speed units are supported?
Miles per hour, kilometres per hour, metres per second, feet per second, and knots, with conversion in any direction.
How do I convert km/h to m/s?
Divide by 3.6. So 90 km/h is 25 m/s. This converter does it instantly and handles the reverse and every other pairing.
What is a knot?
One knot is one nautical mile per hour, about 1.852 km/h. It is the standard speed unit in aviation and maritime navigation, and it is supported here.
How precise are the results?
Conversions use the exact defining factors at full floating-point precision, rounded for display, so they are reliable for both everyday and technical use.

// works with your data

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Use this via API

Get a free API key → 
curl -X POST https://thesnaptools.com/api/v1/tools/speed-converter \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"value":"60 mph \u2192 km/h"}'