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It's not totally clear based on Amazon's provided documentation. Intuitively, it feels like it'd cost twice as much as a normal RDS instance for a two-zone deployment; does anyone here have experience with this, and could confirm or disconfirm that?

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3 Answers 3

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Amazon's RDS pricing page has two sections. One for Single-AZ Deployment and one for Multi-AZ Deployment.

Yes, Multi-AZ is about twice the price of Single-AZ. For example I see:

  • db.t2.micro single - $0.017/hour
  • db.t2.micro multi - $0.034/hour
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To estimate the RDS cost I recommend the AWS Simple Monthly Calculator.


For a db.m4.large PostgreSQL instance I get the following:

  • Single-AZ - $140.13/month - no High Availability
  • Multi-AZ - $280.25/month

This means: Single-AZ cost = ½ Multi-AZ cost


Below two screenshots:

Single-AZ

RDS Single-AZ AWS Simple Monthly Calculator estimation

Multi-AZ

RDS Multi-AZ AWS Simple Monthly Calculator estimation


PS: no data transfer costs, no additional backup costs included

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TLDR: Yes it does Kent.

It costs twice as much. Because it's two instances.

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