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 |
