Which factors are used to calculate minimum volume size to support a sustained IOPS target for General Purpose and Provisioned IOPS volumes?

To determine the minimum provisioned capacity to support your desired sustained IOPS, you divide the sustained IOPS by the IOPS-to-volume capacity ratio. gp2 volumes have a 3 to 1 ratio, io1 volumes have a 50 to 1 ratio, and gp3 and io2 volumes have a 500 to 1 ratio. The higher the ratio, the less provisioned capacity is required to support the sustained IOPS.