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Area Convertor

This script converts between various units of area, including:

Imperial - square inches, feet, miles, acres

Metric - square centimetres, metres, kilometres, hectares

Paste the code below into the head section of your page:

<SCRIPT LANGUAGE="JavaScript"> exp=0; function convert(ainput) { var result = 0.0; var i=0; var unita=''; var unitb=''; var astring=""; var outstring=""; for (i=0; i<=document.Form1.from.length-1; i++){ if (document.Form1.from.options[i].selected==1){ unita = document.Form1.from.options[i].value } } for (i=0; i<=document.Form1.to.length-1; i++){ if (document.Form1.to.options[i].selected==1){ unitb = document.Form1.to.options[i].value } } astring=ainput; if(isNaN(astring)==true){ document.Form1.result="Please enter a number."; }else{ invalue = parseFloat(ainput); if (unita==unitb){result = invalue*1;} if (unita=="square inches"){ if (unitb=="square feet"){result = invalue/Math.pow(12,2); }else{ if (unitb=="square yards"){result = invalue/Math.pow(12*3,2); }else{ if (unitb=="square miles"){result = invalue/Math.pow(12*3*1760,2); }else{ if (unitb=="square mm"){result = invalue*Math.pow(25.4,2); }else{ if (unitb=="square cm"){result = invalue*Math.pow(2.54,2); }else{ if (unitb=="square metres"){result = invalue*Math.pow(0.0254,2); }else{ if(unitb=="square km"){result=invalue*Math.pow(0.0000254,2); }else{ if(unitb=="acres"){result=invalue/(144*9*4840); }else{ if(unitb=="hectares"){result=invalue*Math.pow(25.4/(1000*100),2) } } } } } } } } } } if (unita=="square feet"){ if (unitb=="square inches"){result = invalue*Math.pow(12,2); }else{ if (unitb=="square yards"){result = invalue/Math.pow(3,2); }else{ if (unitb=="square miles"){result = invalue/Math.pow(3*1760,2); }else{ if (unitb=="square mm"){result = invalue*Math.pow(12*25.4,2); }else{ if (unitb=="square cm"){result = invalue*Math.pow(12*2.54,2); }else{ if (unitb=="square metres"){result = invalue*Math.pow(12*0.0254,2); }else{ if(unitb=="square km"){result=invalue*Math.pow(12*0.0000254,2); }else{ if(unitb=="acres"){result=invalue/(9*4840); }else{ if(unitb=="hectares"){result=invalue*Math.pow((12*25.4)/(1000*100),2) } } } } } } } } } } if (unita=="square yards"){ if (unitb=="square inches"){result = invalue*Math.pow(12*3,2); }else{ if (unitb=="square feet"){result = invalue*Math.pow(3,2); }else{ if (unitb=="square miles"){result = invalue/Math.pow(1760,2); }else{ if (unitb=="square mm"){result = invalue*Math.pow(3*12*25.4,2); }else{ if (unitb=="square cm"){result = invalue*Math.pow(3*12*2.54,2); }else{ if (unitb=="square metres"){result = invalue*Math.pow(3*12*0.0254,2); }else{ if(unitb=="square km"){result=invalue*Math.pow(3*12*0.0000254,2); }else{ if(unitb=="acres"){result=invalue/(4840); }else{ if(unitb=="hectares"){result=invalue*Math.pow((25.4*12*3)/(1000*100),2) } } } } } } } } } } if (unita=="square miles"){ if (unitb=="square inches"){result = invalue*Math.pow(1760*12*3,2); }else{ if (unitb=="square feet"){result = invalue*Math.pow(1760*3,2); }else{ if (unitb=="square yards"){result = invalue*Math.pow(1760,2); }else{ if (unitb=="square mm"){result = invalue*Math.pow(1760*3*12*25.4,2); }else{ if (unitb=="square cm"){result = invalue*Math.pow(1760*3*12*2.54,2); }else{ if (unitb=="square metres"){result = invalue*Math.pow(1760*3*12*0.0254,2); }else{ if(unitb=="square km"){result=invalue*Math.pow(1760*3*12*0.0000254,2); }else{ if(unitb=="acres"){result=invalue*(1760*1760)/(4840); }else{ if(unitb=="hectares"){result=invalue*Math.pow(25.4*(63360)/(1000*100),2) } } } } } } } } } } if (unita=="square mm"){ if (unitb=="square inches"){result = invalue/Math.pow(25.4,2); }else{ if (unitb=="square feet"){result = invalue/Math.pow(25.4*12,2); }else{ if (unitb=="square yards"){result = invalue/Math.pow(25.4*12*3,2); }else{ if (unitb=="square miles"){result = invalue/Math.pow(1760*3*12*25.4,2); }else{ if (unitb=="square cm"){result = invalue/Math.pow(10,2); }else{ if (unitb=="square metres"){result = invalue/Math.pow(1000,2); }else{ if(unitb=="square km"){result=invalue/Math.pow(1000000,2); }else{ if(unitb=="acres"){result=invalue/(25.4*25.4*144*9*4840); }else{ if(unitb=="hectares"){result=invalue/Math.pow(1000*100,2) } } } } } } } } } } if (unita=="square cm"){ if (unitb=="square inches"){result = invalue*Math.pow(10/(25.4),2); }else{ if (unitb=="square feet"){result = invalue*Math.pow(10/(25.4*12),2); }else{ if (unitb=="square yards"){result = invalue*Math.pow(10/(25.4*12*3),2); }else{ if (unitb=="square miles"){result = invalue*Math.pow(10/(1760*3*12*25.4),2); }else{ if (unitb=="square mm"){result = invalue*Math.pow(10,2); }else{ if (unitb=="square metres"){result = invalue*Math.pow(10/1000,2); }else{ if(unitb=="square km"){result=invalue*Math.pow(10/1000000,2); }else{ if(unitb=="acres"){result=invalue/(2.54*2.54*144*9*4840); }else{ if(unitb=="hectares"){result=invalue/Math.pow(100*100,2) } } } } } } } } } } if (unita=="square metres"){ if (unitb=="square inches"){result = invalue*Math.pow(10*100/(25.4),2); }else{ if (unitb=="square feet"){result = invalue*Math.pow(10*100/(25.4*12),2); }else{ if (unitb=="square yards"){result = invalue*Math.pow(10*100/(25.4*12*3),2); }else{ if (unitb=="square miles"){result = invalue*Math.pow(10*100/(1760*3*12*25.4),2); }else{ if (unitb=="square mm"){result = invalue*Math.pow(10*100,2); }else{ if (unitb=="square cm"){result = invalue*Math.pow(100,2); }else{ if(unitb=="square km"){result=invalue/Math.pow(1000,2); }else{ if(unitb=="acres"){result=invalue/(0.0254*0.0254*144*9*4840); }else{ if(unitb=="hectares"){result=invalue/Math.pow(100,2) } } } } } } } } } } if (unita=="square km"){ if (unitb=="square inches"){result = invalue*Math.pow(10*100*1000/(25.4),2); }else{ if (unitb=="square feet"){result = invalue*Math.pow(10*100*1000/(25.4*12),2); }else{ if (unitb=="square yards"){result = invalue*Math.pow(10*100*1000/(25.4*12*3),2); }else{ if (unitb=="square miles"){result=invalue*Math.pow(1000000/(1760*3*12*25.4),2); }else{ if (unitb=="square mm"){result = invalue*Math.pow(10*100*1000,2); }else{ if (unitb=="square cm"){result = invalue*Math.pow(100*1000,2); }else{ if(unitb=="square metres"){result=invalue*Math.pow(1000,2); }else{ if(unitb=="acres"){result=invalue/(0.0000254*0.0000254*144*9*4840); }else{ if(unitb=="hectares"){result=invalue*Math.pow(1000/100,2); } } } } } } } } } } if (unita=="acres"){ if (unitb=="square inches"){result = invalue*4840*9*144; }else{ if (unitb=="square feet"){result = invalue*4840*9; }else{ if (unitb=="square yards"){result = invalue*4840; }else{ if (unitb=="square miles"){result=invalue*4840/(1760*1760); }else{ if (unitb=="square mm"){result = invalue*(4840*9*144*25.4*25.4); }else{ if (unitb=="square cm"){result = invalue*(4840*9*144*2.54*2.54); }else{ if(unitb=="square metres"){result=invalue*(4840*9*144*0.0254*0.0254); }else{ if(unitb=="square km"){result=invalue*(4840*9*144*0.0000254*0.0000254); }else{ if(unitb=="hectares"){result=invalue*(4840*9*144*0.000254*0.000254); } } } } } } } } } } if (unita=="hectares"){ if (unitb=="square inches"){result = invalue*Math.pow(100*1000/25.4,2); }else{ if (unitb=="square feet"){result = invalue*Math.pow(100*1000/(25.4*12),2); }else{ if (unitb=="square yards"){result = invalue*Math.pow(100*1000/(25.4*12*3),2); }else{ if (unitb=="square miles"){result=invalue*Math.pow(100*1000/(1760*3*12*25.4),2); }else{ if (unitb=="square mm"){result = invalue*Math.pow(100*1000,2); }else{ if (unitb=="square cm"){result = invalue*Math.pow(10*1000,2); }else{ if(unitb=="square metres"){result=invalue*Math.pow(100,2); }else{ if(unitb=="acres"){result=invalue*100*100*1000*1000/(25.4*25.4*144*9*4840); }else{ if(unitb=="square km"){result=invalue*Math.pow(100/1000,2); } } } } } } } } } } outstring=" "+unitb; result=Math.round(result); document.Form1.result.value=result+" "+unitb; } } </SCRIPT>

And this goes into the body section:

<FORM NAME="Form1"> <table align=center border=1 cellpadding=10 cellspacing=2> <tr><td colspan=2 align=center height=100 bgcolor=000088><b>Enter an amount, select the appropriate <br> units, and click <i>Calculate</i> </td></tr> <tr><td>Convert <INPUT TYPE="TEXT" NAME="areainput" size=5> </td><td><SELECT NAME="from"> <OPTION VALUE="acres">acres</OPTION> <OPTION VALUE="hectares">hectares</OPTION> <OPTION VALUE="square inches">square inches</OPTION> <OPTION VALUE="square metres">square metres</OPTION> <OPTION VALUE="square feet">square feet</OPTION> <OPTION VALUE="square yards">square yards</OPTION> <OPTION VALUE="square miles">square miles</OPTION> <OPTION VALUE="square mm">square mm</OPTION> <OPTION VALUE="square cm">square cm</OPTION> <OPTION VALUE="square km">square km</OPTION> </select> to <SELECT NAME="to"> <OPTION VALUE="square metres">square metres</OPTION> <OPTION VALUE="acres">acres</OPTION> <OPTION VALUE="hectares">hectares</OPTION> <OPTION VALUE="square inches">square inches</OPTION> <OPTION VALUE="square feet">square feet</OPTION> <OPTION VALUE="square yards">square yards</OPTION> <OPTION VALUE="square miles">square miles</OPTION> <OPTION VALUE="square mm">square mm</OPTION> <OPTION VALUE="square cm">square cm</OPTION> <OPTION VALUE="square km">square km</OPTION> </SELECT></td></tr> <tr><td colspan=2 align=center height=70 bgcolor=000088><INPUT TYPE="BUTTON" NAME="calculate" VALUE="Calculate" ONCLICK="convert(Form1.areainput.value)" style="background:000040; color=ddeeff; font-family=garamond; font-size=12pt; font-weight:bold;" onFocus="this.blur()"></td></tr> <tr><td valign=top align=right>Result :</td><td><input type=text name=result size=20> </td></tr></table></form>

How It Works

Form1 holds all the input boxes and dropdown menus:

areainput - where you place your conversion number

from - the first dropdown menu

to - the second dropdown menu

calculate - the Calculate button

result - the Result box

Clicking the Calculate button passes the user's input value to the function convert():

onClick="convert(Form1.areainput.value)"

First, all dropdown options are scanned to see which option is selected, and:

the from option value is assigned to the variable unita

the to option value is assigned to variable unitb

When you input a number, its value is assigned to variable ainput.

This is then processed by parseFloat and assigned to variable invalue.

The rest of the script simply does the appropriate unit conversions, depending on the parameters selected.

For example, if you wish to convert square inches to square feet, this section is is called:

if (unita=="square inches")
{
    if (unitb=="square feet")
    {
        result = invalue/Math.pow(12,2)
    }
}

where:

invalue is the user input value

Math.pow(12,2) is 12 raised to the power of 2 - ie: 12 x 12 =144

result is the value passed to the Result box

So if you enter 288 square inches, that value is divided by 144 to give you 2 square feet.

Try It Out

� 2001 CyberSchool

Enter an amount, select the appropriate units, and click Calculate
Convert	to

Result :