title: Calculating future value with compound interest with JavaScript
body: <p>I'm trying to work on a script where the user inserts a monthly income and gets the future value with compound interest after 30 years. As it is now, I've assigned some values for testing purposes. </p>
  
  <pre><code>// Future Value
  var investment = 800;
  var annualRate = 2;
  var monthlyRate = annualRate / 12 / 100;
  var years = 30;
  var months = years * 12;
  var futureValue = 0;
  
  for ( i = 1; i &lt;= months; i++ ) {
      futureValue = futureValue + investment * Math.pow(1 + monthlyRate, months);
  }
  </code></pre>
  
  <p>Problem is, I'm actually building this from an Excel spreadsheet that's using the built-in FV() formula and when cross checking, my results are totally off... Any idea what I'm doing wrong since I'm not into finance math at all. Thanks in advance.</p>