Speed Converter

Convert between different speed units including meters per second, kilometers per hour, miles per hour, knots, and more.

Speed Converter
ready
$ convert --from [unit] --to [unit] --value [number]
$
>
formulas.ts

// Common Speed Converter Formulas

1const1 km/h β‰ˆ 0.278 m/s
2const1 mph β‰ˆ 1.609 km/h
3const1 knot β‰ˆ 1.852 km/h
4const1 Mach β‰ˆ 1225 km/h (at sea level)
references.json

// Common Speed Converter References

{
"Average Walking Speed":"5 km/h",
"Average Running Speed":"10-15 km/h",
"Average Cycling Speed":"15-25 km/h",
"Typical Car Speed":"60-120 km/h",
"Commercial Airplane Speed":"800-900 km/h",
"Speed of Sound":"343 m/s"
}
guide.md

Speed as distance over time

Speed units combine a length unit with a time unit: meters per second, kilometers per hour, miles per hour, knots. Converting speed means converting both the distance part and the time part, or using a composite factor that already includes both.

method.ts

Method

  1. Convert the input to meters per second (SI derived unit of speed).
  2. Convert m/s to the target unit using the matching length and time factors.
  3. Knots use nautical miles per hour (1 kn = 1852 m/h).
sources.md

Sources

  • - SI Brochure: meter per second as SI unit of speed.
  • - International definition of the nautical mile: 1852 m.
  • - NIST SP 811: mph and km/h conversion factors.
examples.md

Worked examples

Highway: 100 km/h to mph

  1. 100 km/h = 100,000 m / 3600 s β‰ˆ 27.7778 m/s.
  2. 1 mph = 0.44704 m/s.
  3. 27.7778 / 0.44704 β‰ˆ 62.137 mph.

Result: 100 km/h β‰ˆ 62.14 mph

Sailing: 15 knots to km/h

  1. 1 kn = 1.852 km/h.
  2. 15 Γ— 1.852 = 27.78 km/h.

Result: 15 kn = 27.78 km/h

Nuances

  • β€’ Pace (min/km) is the inverse of speed; do not feed pace into a speed converter without inverting first.
  • β€’ Indicated airspeed in aviation is not the same as ground speed.
  • β€’ Posted road limits may round; always follow the sign’s unit system in that country.

Uses

  • - Understanding foreign speed limits while driving.
  • - Comparing running paces expressed as km/h vs mph.
  • - Marine and aviation contexts that quote knots.
FAQ.md

Speed FAQ

01 Q: Quick km/h to mph rule?

Multiply km/h by 0.621 for a close estimate, or divide by 1.609.

02 Q: What is walking speed in m/s?

A typical walk is about 1.4 m/s (roughly 5 km/h).