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Speed Converter Units

Convert km/h, mph, knots, meters per second and Mach.

Speed Converter is a free online tool that convert km/h, mph, knots, meters per second and Mach. It runs entirely in your web browser using plain JavaScript, so files are processed on your own device and never uploaded to a server. There is no sign-up, no file size limit imposed by the site, no watermark and no paid tier.

Price
Free — no account, no quota, no watermark
Category
Units
Where it runs
In your browser, on your device
Files uploaded
None
Technology
plain JavaScript
Settings
3
Works offline
Yes, after the first visit

About Speed Converter

Speed Converter is one of 19 units tools on DuckyTools, and like all of them it runs entirely inside this page. Convert km/h, mph, knots, meters per second and Mach.

How to use it

  1. Enter value, from and to.
  2. Results update the moment anything changes.

The 3 settings

SettingWhat it doesDefault
ValueA numeric value.100
FromChoose from 6: Meters per second, Kilometers per hour, Miles per hour, Feet per second, Knots, Mach (at sea level).Kilometers per hour
ToChoose from 6: Meters per second, Kilometers per hour, Miles per hour, Feet per second, Knots, Mach (at sea level).Miles per hour

Conversion reference

Exact factors used by this converter, expressed against meters per second (m/s). These are the defined values, not rounded approximations.

UnitSymbolIn m/s
Meters per secondm/s1
Kilometers per hourkm/h0.277777778
Miles per hourmph0.44704
Feet per secondft/s0.3048
Knotskn0.514444444
Mach (at sea level)Ma340.29

Under the hood

Runs onplain JavaScript — runs the whole thing
ControlsValue, From, To

Questions

What does the from option change?

It offers 6 choices — Meters per second, Kilometers per hour, Miles per hour and Feet per second and more. The default is Kilometers per hour, which suits most cases; change it when your input or your destination calls for something specific.