Speed converter

Convert speeds between km/h, mph, m/s, ft/s and knots. 1 mph is exactly 1.609344 km/h, and 1 m/s is 3.6 km/h.

Value

From

Result

km/h

1 mph = 1.60934 km/h

Digits

Same amount, two scales

100 mph

160.9 km/h

Both bars show the same amount: 100 mph on top, 160.9 km/h below.

Quick challenge

Streak 0Best 0

Guess the conversion before you calculate it. How many can you get in a row?

How it works

Speeds are converted through meters per second. Road speeds use km/h or mph, science uses m/s, and sea and air navigation use knots (nautical miles per hour, 1.852 km/h).

All units compared

All units compared
Unit	Symbol	Value in meters per second
meter per second	m/s	1 m/s
kilometer per hour	km/h	0.2777777778 m/s
mile per hour	mph	0.44704 m/s
foot per second	ft/s	0.3048 m/s
knot	kn	0.5144444444 m/s

Frequently asked questions

How do I convert km/h to m/s?

Divide by 3.6. For example, 90 km/h ÷ 3.6 = 25 m/s.

Is a knot faster than a mile per hour?

Yes. 1 knot is about 1.151 mph (1.852 km/h).

How many kilometers per hour are in 1 mile per hour?

1 mile per hour = 1.60934 kilometers per hour. The other way round, 1 kilometer per hour = 0.621371 miles per hour.

How many miles per hour are in 1 kilometer per hour?

1 kilometer per hour = 0.621371 miles per hour. The other way round, 1 mile per hour = 1.609344 kilometers per hour.