Financial Calculators: Compound Interest, NPV, IRR and Mortgage

The compound interest calculator grows a starting balance plus regular contributions at any compounding frequency, showing future value, total contributed, interest earned and the effective annual rate.

The annuity tab values a stream of equal payments both ways — future value and present value — for ordinary annuities or annuities due, plus the perpetuity value.

The mortgage calculator returns your monthly principal and interest, the payment including property tax and insurance, total interest over the term and a month-by-month amortisation schedule.

The NPV and IRR tab takes one cash flow per line starting at period 0, then computes net present value at your discount rate, the internal rate of return, profitability index and simple payback period.