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How/when does Amazon calculate how much I will have to pay for EBS?

I accidentally created a 100 GiB EBS volume and deleted it after 20 mins when I realized what I had done, does it mean I will be charged $10 at the end of the month?

It's been a couple of hours and it doesn't look like I've been charged with anything.

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3 Answers 3

up vote 9 down vote accepted

EBS is charged hourly and it's against what you allocate. The snapshots are supposed to only be what you've used within the allocation. For 100GB it'll get rounded up to a whole hour's usage and assuming the East or West region you should warn your bank about the incoming charge of about $0.02.

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This makes sense, thanks! –  mak Nov 3 '10 at 7:00

EBS charges for space that you've allocated; so if you use 1GB on a 100GB volume, you'll be charged for 100GB. The clencher here is that you get charged on an hourly basis. I.e., 100GB would be $10 monthly, meaning if you kept the 100GB instance up for an hour, you'd be charged $0.0000039 for use.

If you store a SNAPSHOT, you'll be charged for the data that you actually use--because the snapshot process ignores empty pages. Take a look at the last section on the EBS page for details.

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You're absolutely right; however, I found out why I wasn't charged anything either (or at least, nothing more than a penny). I have reverted my answer. –  Andrew M. Nov 3 '10 at 12:18

EBS storage is not an hourly charge but a monthly. Even if you have all of your instances powered off you are still charged for your EBS usage.

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