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How TO - Speed Converter


Learn how to create a speed converter with HTML and JavaScript.


Speed Converter

Type a value in any of the fields to convert between speed measurements:


Create a Speed Converter

Create an input element that can convert a value from one speed measurement to another.

Step 1) Add HTML:

Example - MPH to KPH

<p>
  <label>MPH</label>
  <input id="inputMPH" type="number" placeholder="MPH"
  oninput="speedConverter(this.value)"
  onchange="speedConverter(this.value)">
</p>
<p>KPH: <span id="outputKPH"></span></p>

Step 2) Add JavaScript:

Example - MPH to KPH

/* When the input field receives input, convert the value from mph to kph */
function speedConverter(valNum) {
  valNum = parseFloat(valNum);
  document.getElementById("outputKPH").innerHTML=valNum*1.609344;
}
Try it Yourself »


Convert from MPH to other Measurements

The table below shows how to convert from MPH to other speed measurements:

Description Formula Example
Convert from MPH to KPH KPH=MPH*1.609344 Try it
Convert from MPH to Knots knots=MPH/1.150779 Try it
Convert from MPH to Mach Mach=MPH/761.207 Try it

Convert from KPH to other Measurements

The table below shows how to convert from KPH to other speed measurements:

Description Formula Example
Convert from KPH to MPH MPH=KPH/1.609344 Try it
Convert from KPH to Knots knots=KPH/1.852 Try it
Convert from KPH to Mach Mach=KPH/1225.044 Try it

Convert from Knots to other Measurements

The table below shows how to convert from Knots to other speed measurements:

Description Formula Example
Convert from Knots to MPH MPH=knots*1.150779 Try it
Convert from Knots to KPH KPH=knots*1.852 Try it
Convert from Knots to Mach Mach=knots/661.4708 Try it

Convert from Mach to other Measurements

The table below shows how to convert from Mach to other speed measurements:

Description Formula Example
Convert from Mach to MPH MPH=Mach*761.207 Try it
Convert from Mach to KPH KPH=Mach*1225.044 Try it
Convert from Mach to Knots knots=Mach*661.4708 Try it