Full version: jsB@nk » Calculation » Loan Payment Calculator
URL: https://www.javascriptbank.com/loan-payment-calculator.html
A JavaScript calculator code that calculates your monthly loan payment.
Full version: jsB@nk » Calculation » Loan Payment Calculator
URL: https://www.javascriptbank.com/loan-payment-calculator.html
<style type="text/css">body{background-color:white;font-size:10pt;color:black;font-family:sans-serif;}</style><!-- This script downloaded from www.JavaScriptBank.com Come to view and download over 2000+ free javascript at www.JavaScriptBank.com--><script language="javascript">var amount, apr, n, payment, npy, tablebuilt=false;function calculate(){var d=document.f;amount=d.amount.value;apr=d.apr.value;n=d.n.value;npy=d.npy.value;if( (amount!='') && (n!='') && (apr!='') && (npy!='') ){tmp=Math.pow((1+(apr/100/npy)), (n*npy));payment=(amount*tmp*(apr/100/npy))/(tmp-1);if((!isNaN(payment))&&(payment!=Number.POSITIVE_INFINITY)&&(payment!=Number.NEGATIVE_INFINITY)){d.payment.value=round(payment);d.totpaid.value=round(payment*n*npy);d.intpaid.value=round((payment*n*npy)-amount);}else alert('Error:\nOne or more fields contain data\nwhich cannot be used in the\ncalculation.');}else alert('Error:\nYou did not provide enough data.');}function round(val){tmp=Math.round(val*100)/100+'';if(tmp.indexOf('.')==-1)tmp+='.00';else if(tmp.length-tmp.indexOf('.')==2)tmp+='0';return tmp;}function resetall(){var d=document.f;d.amount.value='';d.apr.value='';d.n.value='';d.npy.value=12;d.payment.value='';d.totpaid.value='';d.intpaid.value='';d.amount.focus();}function buildtable(){tablebuilt=true;txt='<html><head><title>Payment Schedule</title></head><body bgcolor="#00436e"><center><form>';txt+='<input type="button" value="Close" onClick="self.close()"><br><br>';txt+='<table bgcolor="white" border="1" cellpadding="4">';txt+='<tr><td align="center">Payment<br>Number</td><td align="center">Payment<br>Amount</td><td align="center">Interest</td><td align="center">Principle</td><td align="center">Balance</td></tr>';amount=eval(amount);for(i=1;i<=n*npy;i++){tbldata='<td bgcolor="'+((i%2!=0) ? 'lightgrey' : 'white')+'" align="right">';interest=amount*apr/npy/100;amount+=interest;principle=payment-interest;amount-=payment;txt+='<tr>'+tbldata+i+':</td>'+tbldata+round(payment)+'</td>'+tbldata+round(interest)+'</td>'+tbldata+round(principle)+'</td>'+tbldata+round(amount)+'</td></tr>';}txt+='</table><br><br><input type="button" value="Close" onClick="self.close()"></center></form></body></html>';var psch=window.open('', 'viewsch' ,'top=0,left=0,toolbar=no,scrollbars=yes,resizable=yes,width=500,height=450,menubar=no,status=no');psch.document.write(txt);}window.onload=function(){document.f.amount.focus();}</script><!-- This script downloaded from www.JavaScriptBank.com Come to view and download over 2000+ free javascript at www.JavaScriptBank.com--><form name="f"><table border="1" cellpadding="4"><tr><td><table border="0"><tr><td colspan="2" align="center"><b>Enter Loan Data Here</b></td></tr><tr><td width="400">Loan Amount:</td><td><b>$</b> <input type="text" name="amount" size="10"></td></tr><tr><td>Annual Percentage Rate (APR) %:</td><td><input type="text" name="apr" size="5"><b> %</b></td></tr><tr><td>Repayment period in years:</td><td><input type="text" name="n" size="5"></td></tr><tr><td>Amount of payments per year:</td><td><input type="text" name="npy" size="5" value="12"></td></tr><tr><td colspan="2"> </td></tr><tr><td align="center" colspan="2"><input type="button" value="Calculate" onClick="calculate()"> <input type="button" value="Reset" onClick="resetall()"></td></tr><tr><td colspan="2"><hr></td></tr><tr><td>Amount per payment:</td><td><b>$</b> <input type="text" size="10" name="payment"></td></tr><tr><td>Total paid over the life of the loan:</td><td><b>$</b> <input type="text" size="10" name="totpaid"></td></tr><tr><td>Total interest paid over the life of the loan:</td><td><b>$</b> <input type="text" size="10" name="intpaid"></td></tr><tr><td colspan="2"> </td></tr><tr><td colspan="2" align="center"><input type="button" value="Build Payment Schedule" onClick="buildtable()"><br><br><small>(Please give the script time to work, especially if the loan is for a long time.)</small></td></tr></table></td></tr></table></form><!-- This script downloaded from www.JavaScriptBank.com Come to view and download over 2000+ free javascript at www.JavaScriptBank.com-->