How TO - Speed Converter

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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:

MPH

KPH

Knots

Mach

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

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

KPH:

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

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