Cost Azure managed disks including P-series size snapping, snapshot storage and the GiB you pay for but never use.
Standard HDD, Standard SSD and Premium SSD are sold only in fixed sizes, so a 400 GiB request is billed as a 512 GiB P20 and you pay for 112 GiB you cannot use. Premium SSD v2 and Ultra removed that by billing capacity, IOPS and throughput independently at the exact values you provision. Size snapping quietly inflates storage bills by 20–30% on awkward sizes, and moving a workload to Premium SSD v2 often costs less than the P-series disk it replaces — check the per-GiB prices for your region in the Azure pricing calculator because the tier factors used here are approximations.
Azure Managed Disk
Standard and Premium disks bill at the next size step up (4, 8, 16 … 32,767 GiB), so cost = tier price × snapped size × disks; Premium SSD v2 and Ultra bill the exact provisioned GiB.
Standard and Premium disks bill at the next size step up (4, 8, 16 … 32,767 GiB), so cost = tier price × snapped size × disks; Premium SSD v2 and Ultra bill the exact provisioned GiB. Standard HDD, Standard SSD and Premium SSD are sold only in fixed sizes, so a 400 GiB request is billed as a 512 GiB P20 and you pay for 112 GiB you cannot use. Premium SSD v2 and Ultra removed that by billing capacity, IOPS and throughput independently at the exact values you provision.
Size snapping quietly inflates storage bills by 20–30% on awkward sizes, and moving a workload to Premium SSD v2 often costs less than the P-series disk it replaces — check the per-GiB prices for your region in the Azure pricing calculator because the tier factors used here are approximations.
This calculator takes 8 inputs: Provisioned size per disk, Number of disks, Disk tier, Standard HDD price per GiB, Snapshot data stored, Snapshot price per GiB, Standard-tier transactions, Price per 10,000 transactions. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.