The JavaScript Source: Math Related: Compound Interest

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Compound Interest

Use JavaScript to calculate compound interest. Warns about doubtful data. Revised! The script now has a better handling of "doubtful" data and the code has been further streamlined.

The JavaScript Source: Math Related: Compound Interest
Simply click inside the window below, use your cursor to highlight the script, and copy (type Control-c or Apple-c) the script into a new file in your text editor (such as Note Pad or Simple Text) and save (Control-s or Command-s). The script is yours!!!

  <HEAD> <SCRIPT LANGUAGE="JavaScript">     </script> </HEAD>  <BODY onLoad="frm.pr.focus()">  <CENTER> <FORM METHOD="GET" NAME="frm" onReset="frm.pr.focus()"> <TABLE BORDER=5 BGCOLOR=C0C0C0 CELLPADDING=2 WIDTH=> <TR><TD COLSPAN=3 ALIGN="CENTER"> <B><FONT SIZE="5" COLOR="#0000FF">C<FONT SIZE="4">OMPOUND <FONT SIZE="5">I<FONT SIZE="4">NTEREST</FONT></B> </TD></TR> <TR><TD ALIGN="RIGHT">Principal</TD><TD> <INPUT TYPE="TEXT" NAME="pr" VALUE="" SIZE="10" MAXLENGTH="10" onChange="calcAmt(this.form)"></TD> <TD ROWSPAN="4" ALIGN="CENTER" BGCOLOR="#CBCBCB"><FONT SIZE="1">Months<BR> 1 = .08<BR> 2 = .17<BR> 3 = .25<BR> 4 = .33<BR> 5 = .42<BR> 6 = .50<BR> 7 = .58<BR> 8 = .67<BR> 9 = .75<BR>10 = .83<BR>11 = .92</FONT></TD></TR> <TR><TD ALIGN="RIGHT">Rate</TD><TD> <INPUT TYPE="TEXT" NAME="rt" VALUE="" SIZE="5" MAXLENGTH="6" onChange="calcAmt(this.form); checkRate(this.form)"></TD></TR> <TR><TD ALIGN="RIGHT">Years</TD><TD> <INPUT TYPE="TEXT" NAME="yr" VALUE="" SIZE="5" MAXLENGTH="6" onChange="calcAmt(this.form); checkTerm(this.form)"></TD></TR> <TR><TD ALIGN="RIGHT">Amount</TD><TD> <INPUT TYPE="TEXT" NAME="amt" VALUE="" SIZE="10"></TD></TR> <TR><TD ALIGN="RIGHT">Interest</TD><TD> <INPUT TYPE="TEXT" NAME="intr" VALUE="" SIZE="10"></TD><TD> </TD></TR> <TR><TD> <INPUT TYPE="BUTTON" NAME="calc" VALUE="Calculate" SIZE="10" onClick="calcAmt(this.form)"></TD><TD> </TD> <TD> <INPUT TYPE="RESET" NAME="clear" VALUE="Clear"></TD></TR> </TABLE> </FORM> </CENTER> <p><center> <font face="arial, helvetica" size"-2">Free JavaScripts provided<br> by <a href="http://javascriptsource.com">The JavaScript Source</a></font> </center><p> 
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