FinancesOSX is a tool designed to calculate the value of any one of five calculation parameters for four types of financial calculations: Loans, Investments, Deposits and Withdrawals ... given values for the remaining four parameters.
Loans are the conventional installment loans with an initial fixed loan amount to be paid back in regular payments over a fixed period of years at a specific interest rate.
Investments are an initial lump sum amount of money that grows to a larger amount over a period of years at a fixed rate of growth, as would be for the case of investing a lump sum from an inheritance or winning the lottery.
Deposits are regular periodic deposits of a fixed amount into an account that grows at a constant rate over a fixed number of years, such as an investment club or a regular savings plan.
Withdrawals determine how long you can take a periodic fixed amount from an initial lump sum investment at a fixed growth (interest) rate before the account is totally depleted, answering the question 'How long will my life-long savings last after I retire?'