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72
73	
74	<H1>Compound Interest Calculator</H1>
75		
76		<P>
77		<FORM NAME="mainform" ACTION="JavaScript:doCalc()" METHOD="POST">
78		<CENTER>
79		<TABLE BGCOLOR="#0099cc" BORDER="0" CELLPADDING="1" CELLSPACING="0"><TR><TD>
80		<TABLE WIDTH="400" BORDER="0" CELLSPACING="0" BGCOLOR="#EEEEEE">
81		<TR>
82			<TD COLSPAN=3>
83				<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0>
84					<TR BGCOLOR="#0099cc"><TD ALIGN="center"><FONT COLOR="#FFFFFF"><B>Inputs</B></FONT></TD></TR>
85				</TABLE>
86			</TD>
87		</TR>
88	
89		<TR>
90			<TD>
91					Current Principal:
92			</TD>
93			<TD>
94				$
95			</TD>
96			<TD>
97				<INPUT TYPE="TEXT" NAME="p" SIZE="10" onChange="value=formatNumber(value,2,0)">
98			</TD>
99		</TR>
100
101		<TR>
102			<TD>
103					Annual Addition:
104			</TD>
105			<TD>
106				$
107			</TD>
108			<TD>
109				<INPUT TYPE="TEXT" NAME="c" SIZE="10" onChange="value=formatNumber(value,2,0)">
110			</TD>
111		</TR>
112		
113		<TR>
114			<TD>
115				Years to grow:
116			</TD>
117			<TD>
118				&nbsp;
119			</TD>
120			<TD>
121				<INPUT TYPE="TEXT" NAME="y" SIZE="6" VALUE="" onChange="value=numval(value,2,1)">
122			</TD>
123		</TR>
124		<TR>
125			<TD>
126				Interest Rate:
127			</TD>
128			<TD>
129				&nbsp;
130			</TD>
131			<TD>
132				<INPUT TYPE="TEXT" NAME="r" SIZE="6" VALUE="" onChange="value=numval(value,2,-100)"> %
133			</TD>
134		</TR>
135		
136		<TR>
137			<TD COLSPAN="3">
138				Compound interest
139				<INPUT TYPE="TEXT" NAME="n" SIZE="4" VALUE="1" MAXLENGTH="4" onChange="value=numval(value,0,1)">
140				time(s) annually
141			</TD>
142		</TR>
143
144		<TR>
145			<TD COLSPAN="3">
146				Make additions at
147				<INPUT TYPE="RADIO" NAME="addTiming" VALUE="start" CHECKED> start
148				<INPUT TYPE="RADIO" NAME="addTiming" VALUE="end"> end
149				of each compounding period
150			</TD>
151		</TR>
152		
153		<TR>
154			<TD COLSPAN=3 ALIGN="CENTER">&nbsp;<BR>
155				<INPUT TYPE="BUTTON" VALUE="Calculate" onClick="doCalc()">
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160			<TD COLSPAN=3>
161				<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0>
162					<TR BGCOLOR="#0099cc"><TD ALIGN="center"><FONT COLOR="#FFFFFF"><B>Results</B></FONT></TD></TR>
163				</TABLE>
164			</TD>
165		</TR>
166			
167		<TR>
168			<TD>
169				Future Value:
170			</TD>
171			<TD>
172				$
173			</TD>
174			<TD>
175				<INPUT TYPE="TEXT" NAME="fv" SIZE="10" READONLY>
176			</TD>
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188		
189	<P>&nbsp;<P>
190	<H2>Compound Interest Formula</H2>
191	<P>
192	Compound interest - meaning that the interest you earn each year is added to your principal, so that the balance doesn't merely grow, it grows at an increasing rate - is one of the most useful concepts in finance.
193	It is the basis of everything from a <A HREF="/features/cheapskate_calculator.htm">personal savings plan</A> to the <A HREF="/features/market_cagr.htm">long term growth of the stock market</A>.
194	It also accounts for the <A HREF="/articles/econ/inflation_calculator.htm">effects of inflation</A>,
195	and the <A HREF="/features/debt_payment_calculator.htm">importance of paying down your debt</A>.
196	<P>
197	See <A HREF="/articles/finworks/fmintro.htm">How Finance Works</A> for the <A HREF="/articles/finworks/fmfutval.htm">compound interest formula</A>,
198	(or the advanced <A HREF="/articles/finworks/fmbasinv.htm">formula with annual additions</A>),
199	as well as a calculator for <A HREF="/articles/finworks/continuous_compounding.htm">periodic and continuous compounding</A>.
200	<P>
201	If you'd like to know how to <I>estimate</I> compound interest, see the article on
202	<A HREF="/features/rule72.htm">The Rule of 72</A>.
203	<P>
204	(Also compare <A HREF="/features/simple_interest_calculator.htm">simple interest</A>.)
205
206	<P>&nbsp;<P>
207
208	<CENTER>
209	<A HREF="/articles/finworks/fmfutval.htm"><img src="/articles/finworks/compound_interest.gif" width=400 height=210 border=0 title="Compound interest graph: click for formula" alt="Compound interest graph: click for formula"></A>
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302	var n = numval(document.mainform.n.value);
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