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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.
EBS is charged per-second (as of Sept 2017, before that it was per-hour) and it's against what you allocate. The minimum is 60 seconds.
The snapshots size is supposed to only be non-empty blocks since the allocation, and each subsequent snapshot is of the blocks that have changed since the last snapshot. EBS snapshots are still charged per-hour.
For 100GB gp2 it'll be charged about 20 minutes of usage (and some number of seconds) and assuming $0.10/GB/Month you should warn your bank about the incoming charge of about $0.0046.
Per-second announcement: https://aws.amazon.com/blogs/aws/new-per-second-billing-for-ec2-instances-and-ebs-volumes/
Cost calculation example: https://aws.amazon.com/ebs/pricing/
Thanks to @Vorsprung for the hint.
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.
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.
