If you want to use an Annual Annuity Calculator, click here.
Use this calculator when the annuity is being "built up".
To see the formulas for an ordinary annuity, for any period (along with 4 worked out examples), click here.

This type of annuity is called an ordinary annuity, which means that when payments are made, they are applied at the end of each period. Taking an example from Wikipedia, what is the present value of a 5 year ordinary annuity with an annual interest rate of 12% with monthly payments of 100.00? First, click "MONTHLY" then click "PRESENT VALUE", then enter a monthly amount of 100, for 5 years at 12% interest. We click "CALCULATE" and our answer is $4,495.50.

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