Payback Period

1. Copy and paste the following between your HEAD tags:-

if (PBP.Radio0[2].checked==true)
{RoD2=RoD}

if (PBP.Radio0[1].checked==true)
{RoD2=Math.pow(1+RoD,1/12)-1}

if (PBP.Radio0[0].checked==true)
{RoD2=Math.pow(1+RoD,1/(365/7))-1}

for (y=0.001; y<=limit; y=y+0.001)
{count++;
ans=Math.pow((1+RoD2),-count);
Dis=Dis+ans;

if (Dis<=limit)
{
part1=(limit-Dis)/limit;
part2=part1.toFixed(2);
rslt=parseFloat(count) + parseFloat(part2);

if (PBP.Radio0[0].checked==true)
{result.innerHTML="Payback Period =>=> "+rslt+" weeks"}

if (PBP.Radio0[1].checked==true)
{result.innerHTML="Payback Period =>=> "+rslt+" months"}

if (PBP.Radio0[2].checked==true)
{result.innerHTML="Payback Period =>=> "+rslt+" years"}
		}
	}
}

function RadioCheck0()
{if (PBP.Radio0[0].checked==true)
{xput.innerHTML="<<=Input WEEKLY return=>>";
PBP.Pay.value="Get Payback Period In Weeks";
PBP.returns.style.visibility="visible";
DR.innerHTML="<<= ANNUAL DISCOUNT =>>";
PBP.discount.style.visibility="visible";
PBP.equiv1.style.visibility="visible";
PBP.equiv2.style.visibility="visible";
PBP.returns.value="";
PBP.returns.select()}
}

function RadioCheck1()
{if (PBP.Radio0[1].checked==true)
{xput.innerHTML="<<=Input MONTHLY return=>>";
PBP.Pay.value="Get Payback Period In Months";
PBP.returns.style.visibility="visible";
DR.innerHTML="<<= ANNUAL DISCOUNT =>>";
PBP.discount.style.visibility="visible";
PBP.equiv1.style.visibility="visible";
PBP.equiv2.style.visibility="visible";
PBP.returns.value="";
PBP.returns.select()}
}

function RadioCheck2()
{if (PBP.Radio0[2].checked==true)
{xput.innerHTML="<<=Input YEARLY return=>>";
PBP.Pay.value="Get Payback Period In Years";
PBP.returns.style.visibility="visible";
DR.innerHTML="<<= ANNUAL DISCOUNT =>>";
PBP.discount.style.visibility="visible";
PBP.equiv1.style.visibility="visible";
PBP.equiv2.style.visibility="visible";
PBP.returns.value="";
PBP.returns.select()}
}

function Equiv()
{yrly1=PBP.discount.value;
yrly=yrly1/100;
wly1=Math.pow(1+yrly,1/(365/7))-1;
wly=wly1*100;
mth1=Math.pow(1+yrly,1/12)-1;
mth=mth1*100;
PBP.equiv1.value="Weekly Equiv =>> "+wly.toFixed(6)+" %";
PBP.equiv2.value="Monthly Equiv =>> "+mth.toFixed(6)+" %"
}

function select_area0()
{PBP.capital.select()}

function select_area1()
{PBP.returns.select()}

function select_area2()
{PBP.discount.select()}
</script>

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2. Copy and paste the following code between your BODY tags where you want the input displayed:
<table width=80% border=0 bordercolor=#ffff00 cellspacing="0" cellpadding="0"><tr><td>

<fieldset>
<legend align="center" style="color:#0000ff; max-width:70%; font-size:large;">Payback Period</legend>
<table width=100% border=0 bordercolor=#ffff00 cellspacing="0" cellpadding="0"  style="color:#0000ff">
<tr><td>
<form name="PBP">
<br>

<tr>
<td align="center" colspan=2 style="color:#cc0000"><=<= Capital Investment =>=>
  
<tr><td align="center" colspan=2>  
<input type="text" name="capital" style="text-align:center;color:#0000ff"size=25 onKeyPress="if ((event.keyCode<48) || (event.keyCode>57)) event.returnValue=false" onClick="select_area0()">

</td></tr>

<label for="week"><span style="color:#0000cc">Weekly</span></label>
<input type="radio" name="Radio0" id="week" onClick="RadioCheck0()">
  
<label for="month"><span style="color:#0000cc">Monthly</span></label>
<input type="radio" name="Radio0" id="month" onClick="RadioCheck1()">
  
<label for="year"><span style="color:#0000cc">Yearly</span></label>
<input type="radio" name="Radio0" id="year" onClick="RadioCheck2()">
</td></tr>

<tr><td align="center" colspan=2 style="visibility:'hidden'">
<input type="text" name="returns" value="" size="25" style="color:#0000ff;text-align:center" onKeyPress="if ((event.keyCode<46) || (event.keyCode>57)) event.returnValue=false" onClick="select_area1()">

<tr><td align="center" colspan=2 style="visibility:'hidden'">
<input type="text" name="discount" value="" size="25" style="color:#0000ff;text-align:center" onKeyPress="if ((event.keyCode<46) || (event.keyCode>57)) event.returnValue=false" onClick="select_area2()" onKeyUp="Equiv()">

</td></tr></table>
<br><br>
<tr><td align="center" colspan="2">See also <a href="Internal_Rate_Of_Return.asp"><span onmouseover="this.className='Over'" onmouseout="this.className='OFF'">Internal Rate Of Return</span></a>

</td></tr></table>
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Please Note
If you have any problems or questions please email us at info@datedial.com.

Linking Information:-
TITLE : Payback Period Calculator
URL : http://www.datedial.com/Payback_Period.asp
DESCRIPTION : Payback Period Calculator.