Speed Converter

Convert km/h, mph, m/s, and other speed units instantly.

From (Meters/sec (m/s))

To (Km/hour (km/h))

3.599997

Quick Reference (Meters/sec (m/s) conversions)

1 Meters/sec (m/s)

3.6km/h)

5 Meters/sec (m/s)

18km/h)

10 Meters/sec (m/s)

36km/h)

100 Meters/sec (m/s)

359.9997km/h)

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Quick Tip

Pick the unit you have and the unit you want.

About This Tool

Why use Speed Converter?

Convert between metres per second, kilometres per hour, miles per hour, knots and Mach. These are the units that appear on road signs, in weather reports, in aviation and in physics problems, and they rarely match the one you are given.

The everyday conversions are 1 m/s = 3.6 km/h and 1 mph = 1.609344 km/h exactly. A knot is one nautical mile per hour, or 1.852 km/h, used in shipping and aviation. Mach is the speed of sound, which is not a fixed figure: about 1,225 km/h at sea level and lower at altitude, where the air is colder.

Key Benefits

Road, sea and air units

km/h and mph for driving, knots for marine and aviation use, m/s for physics.

Exact conversion factors

The mile and nautical mile are defined exactly, so results are precise.

Quick reversal

Swap the units to check the conversion the other way round.

How to use Speed Converter

1
Pick the unit you have and the unit you want.
2
Enter the value and read the converted speed.
3
Swap the units to convert back.
4
Remember that Mach varies with altitude and temperature, so treat it as approximate.