Speed Converter

Speed is distance per unit of time. Indian roads and cars use km/h, the US and UK use mph, science uses metres per second, and ships and aircraft use knots.

Results update as you type.

100 km/h in miles per hour

62.1371192 mph

100 km/h in every unit

100 km/h in every unit
UnitValue
Kilometres per hour100
Metres per second27.7777778
Miles per hour62.1371192
Knots53.9956803
Feet per second91.1344415

About this calculator

Enter a speed and choose the units.

How to use it

  1. Enter the value.
  2. Choose the unit it is in and the unit you want.
  3. Read the result, or see every unit in the table.

The formula

Result = value × (m/s in the “from” unit) ÷ (m/s in the “to” unit)
1 km/h
0.2778 m/s
1 mph
1.609 km/h
1 knot
1.852 km/h

Worked example

Highway speed

  1. 100 km/h = 62.14 mph.
  2. = 27.78 m/s.
  3. = 54 knots.

What the result means

The factors are exact international definitions, so results are as accurate as the digits shown.

Assumptions

  • Steady speed.

Limitations

  • Mach number depends on air temperature and is not included.

Frequently asked questions

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

Divide by 3.6.

What is 60 mph in km/h?

96.56 km/h.

What is a knot?

One nautical mile per hour, 1.852 km/h.

Last reviewed on 3 October 2026. Found a mistake? Tell us.