Speed Converter Online Free (mph, km/h, knots)

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Speed Converter — convert between units instantly

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Speed Converter Online

Updated 2026-07-09

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 Enter a speed value in the input panel.
2 Choose the unit you're converting from and the unit you're converting to.
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

No. The conversion runs entirely in your browser, so nothing you enter leaves your machine.

Miles per hour, kilometres per hour, metres per second, feet per second, and knots, with conversion in any direction.

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.

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.

Conversions use the exact defining factors at full floating-point precision, rounded for display, so they are reliable for both everyday and technical use.

// related

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Use this via API

Get a free API key →

curl -X POST https://snaptools.dev/api/v1/tools/speed-converter \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"value":"60 mph \u2192 km/h"}'