Investment calculators

Please add individual investment calculators here with an explanation. Remove any calculators that seem to stay broken.

=Altman Z-Score=
 * Free online Altman Z-Score calculator.

=Free Online Calculators=
 * Investing Calculators

=Savings=
 * Calculator computing the amount that should be saved to accumulate a certain amount after a given number of years.
 * Savings calculator taking tax effects and inflation into account

=ROI=
 * Return on Investment taking intermediate withdrawals and deposits into account
 * Return on Investment taking debt costs, dividends and transaction costs into account

=Retirement=
 * Retirement calculator taking inflation, increasing savings, current and retirement age into account