JavaScript: Calculator Script - MPH RPM Converter G-force

Main Calculator Script MPH RPM Converter G-force

<!-- TWO STEPS TO INSTALL MPH TO RPM CONVERTER:

1.  Copy this part of code inside your HTML HEAD

2.  Add the last code into the BODY of your HTML document  -->

<HEAD><title>JavaScript, java script, javascripts, script, javascript free code!</title>

<!-- Begin

document.converter.mph.focus(true);

function calculate() {

if (document.converter.rim[9].selected) {document.converter.rimspecify.focus();}

else {document.converter.rimspecify.value=document.converter.rim.value;}

if (document.converter.tire[9].selected) {document.converter.tirespecify.focus();}

else {document.converter.tirespecify.value=document.converter.tire.value;}

if (document.converter.mph.value == "") {document.converter.mph.focus(); return;}

var diameter = Math.floor(document.converter.rimspecify.value) + Math.floor(document.converter.tirespecify.value * 2);

var radius = diameter/2      // radius is half of the diameter (inches)

var circumference = 3.1415926535 * radius * radius      // pi * r squared

var speed = document.converter.mph.value/60      // changes MPH to MPM - miles per minute

var feet = speed * 5280      // changes to feet per minute

var inches = feet * 12      // changes to inches per minute

var rpm = inches / circumference      // how many circumferences in that distance

// g force calculator  (with help from www.convertit.com)

feetg = feet/60      // change feet per minut to feet per second

radiusg= radius / 12      // changes radius (inches) to radius (feet)

gforce = ((feetg * feetg)/ 32.2) / (radiusg);

document.converter.showmph.value = document.converter.mph.value;

document.converter.showrpm.value = rpm;

document.converter.showrps.value = rpm/60;

document.converter.gforce.value = gforce;

}

//  End -->

</script>

</HEAD>

<BODY>

<h2>MPH to RPM converter with G-force</h2>

How fast is the car going (MPH) ?: <input type="text" name="mph" size="3" onchange='calculate()'>

What is your rim size? (diameter):<br>

<option value="12">12 inches

<option value="13">13 inches

<option value="14">14 inches

<option value="15">15 inches

<option value="16">16 inches

<option value="17">17 inches

<option value="18">18 inches

<option value="19">19 inches

<option value="other"> Other (specify below)

</select>

<br>

Specify rim: <input type="text" size="2" name="rimspecify" onchange='calculate()'>

What size is your tire?<br>

(distance from rim edge to outside of tire - tread):<br>

<option value="2">2 inches

<option value="3">3 inches

<option value="4">4 inches

<option value="5">5 inches

<option value="6">6 inches

<option value="7">7 inches

<option value="8">8 inches

<option value="9">9 inches

<option value="other"> Other (specify below)

</select>

<br>

Specify tire: <input type="text" size="2" name="tirespecify" onchange='calculate()'>

The RPM for your tires at <input type="text" size="3" name="showmph"> MPH is:<br>

<input type="text" name="showrpm" size="10"> RPM, or <input type="text" name="showrps" size="10"> RPS.

<br>

Your tire tread is spinning with a G-force of <input type="text" name="gforce" size="10"> Gs.

</form>

</div>

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