How to calculate AWS RDS Data Transfer Pricing I'm looking into the possibility of switching my database to Amazon's RDS offering.

At the moment it is just MySQL installed on a normal LEMP server along with everything else the application needs to run.

While the pricing for RDS instances is clear, I can see there is pricing for data transfer out to the internet of $0.090 per GB.

Presumably this includes query results.

But I have no idea how many bytes my query results are, or how many I might use in a day. Therefore I have no idea how much switching to RDS might actually cost.

Is there any way to calculate this?

This may very well be a stupid question but I'd hate to be stung by a huge fee because I didn't fully understand the costs involved.
Based on my experience, AWS does not charge for the query output of RDS Database of MySQL engine, but it charges for Aurora Engine.