What does the Speed Converter work out?

Convert mph, km/h, m/s, knots and feet per second. It is one of the Unit Converters tools on Mondo Knows.

Do I need to sign up, and is my data stored?

No sign-up, and nothing you type is sent anywhere. The calculation runs in your own browser, so the figures stay on your device and the page works offline once loaded.

Mondo Knows Tools

Speed Converter

Convert mph, km/h, m/s, knots and feet per second. Use the free speed converter below to get an instant answer, with the formula shown so you can check the maths and trust the result. Free, private, and no sign-up.

Value

Unit you have

Unit for the big answer

Mondo says

100 km/h =

100

km/h

Metre per second (m/s)27.7778

Kilometre per hour (km/h)100

Mile per hour (mph)62.1371

Knot (kn)53.9957

Foot per second (ft/s)91.1344

Foot per minute (ft/min)5,468.07

Mach (sea level) (Ma)0.0816297

Speed of light (c)0.0000000926567

8 units. The bold row is the unit you picked for the big answer.

How it works

Speed conversions that cover the ones people actually look up: driving between mph and km/h, cycling in km/h, sailing and aviation in knots, and the metres per second that physics homework asks for.

The formula

Every unit is defined by how many base units it is worth, so the conversion is value x factor(from) / factor(to).

Speed Converter: common questions

What does the Speed Converter work out?: Convert mph, km/h, m/s, knots and feet per second. It is one of the Unit Converters tools on Mondo Knows.
How is the Speed Converter calculated?: Speed conversions that cover the ones people actually look up: driving between mph and km/h, cycling in km/h, sailing and aviation in knots, and the metres per second that physics homework asks for. The maths is short enough to check by hand: Every unit is defined by how many base units it is worth, so the conversion is value x factor(from) / factor(to).
Do I need to sign up, and is my data stored?: No sign-up, and nothing you type is sent anywhere. The calculation runs in your own browser, so the figures stay on your device and the page works offline once loaded.

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Estimates for general guidance only. This is not financial, medical or legal advice. Everything runs in your browser and nothing you type is stored.