The "Forecast" column in my Billing & Cost Management Dashboard predicts an unexpectedly high bill for me. Why is my predicted bill so high?

The "Forecast" function is designed to be a rough prediction of your monthly AWS usage, based on your month-to-date charges.

Although most AWS services bill on-demand, meaning your overall bill steadily increases over the course of a month, some services or features bill a larger amount once, usually on or near the first of the month.

This might cause your forecasted usage to appear higher than you expect at the beginning of a month, because your average daily cost is higher at the beginning of the month than it will be over the course of that month. As the month progresses, your usage should normalize, and the forecast will be a more accurate prediction of your final monthly bill.

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Published: 2016-02-05