Estimate your costs – AWS Simple Monthly Calculator
This tool incorporates the latest pricing changes including the tiered pricing model for download bandwidth.
Use this tool to estimate your monthly bill, to determine your best and worst case scenarios (if you get Slashdotted, Dugg etc.), and identify areas of development to reduce your monthly costs and even compare it with other service providers who do not offer utility-style of billing (pay-as-you-go).
You can view the calculator here:
Any feedback to improve this tool is always welcome. Please use the comments section to let us know whether this tool was helpful.