Annuity Formula and Calculator
This annuity calculator includes a definition and formula with explanation.
Banksite Annuity Contribution and Payout Calculator
An annuity calculator that includes several variables including contribution and payout. Published by Banksite.com.
Money Chimp - Annuity Calculator
Variable Annuity Calculator
A very nice variable annuity calculator that includes payout and rate information. There is a list of related definitions at the bottom of the page. The "view report" feature is particularly useful.