Instant Conversions

Speed Converter

Quickly convert between kilometers per hour, miles per hour, meters per second, knots, and other speed units. Useful for travel, physics, aviation, and sports.

Use Cases

  • • Compare speed limits between countries.
  • • Convert the speed of vehicles and aircraft.
  • • Perform calculations in physics and kinematics.
  • • Compare sports records in different units.

Related Tools

For other conversions, see also:

Informe a velocidade conforme a unidade selecionada ao lado.

Referências úteis

  • 100 km/h ≈ 27,78 m/s.
  • 1 nó = 1,852 km/h.
  • 1 mach (20 °C) ≈ 343 m/s.

Understanding Speed Units

Each speed unit has a specific purpose. m/s is the standard of the International System (SI), used in science. km/h is the most common for land vehicles in most countries. mph (miles per hour) dominates in the US and UK. The knot is crucial for safety in maritime and air navigation. And Mach is used to describe supersonic speeds, such as those of jet aircraft.

Quick Reference Table

UnitEquivalence in km/hEquivalence in m/s
100 km/h-27,78 m/s
1 m/s3,6 km/h-
60 mph96,56 km/h26,82 m/s
1 Mach1.234,8 km/h343 m/s

Frequently Asked Questions

Get your questions answered about speed conversions.

How to quickly convert km/h to mph?+

Divide the value in km/h by 1.6 (approximate) or multiply by 0.621371 (exact). For example, 100 km/h ÷ 1.6 ≈ 62.5 mph.

What is a knot in speed?+

A knot is equivalent to one nautical mile per hour, or 1.852 km/h. It is the standard unit of speed in aviation and maritime navigation.

How to convert m/s to km/h?+

Multiply the value in meters per second by 3.6. For example, 10 m/s × 3.6 = 36 km/h.

What is the speed of sound in km/h?+

The speed of sound in air at sea level is approximately 343 m/s, or 1,235 km/h (Mach 1). It varies with temperature and altitude.