Azure Managed Disk Calculator
Cost Azure managed disks including P-series size snapping, snapshot storage and the GiB you pay for but never use.
Inputs
The other tiers are scaled from this reference price.
Only Standard HDD and Standard SSD charge per transaction.
Monthly Cost
$290.25
Billed Size per Disk
512GiB
Paid-for but Unused
112GiB
Disk Capacity Charge
$275.25
Snapshot Charge
$15.00
Transaction Charge
$0.00
Effective Price per Usable GiB
0.1814USD/GiB-month
Step by step
Values used
Provisioned size per disk = 400 GiB; Number of disks = 4 disks; Disk tier = Premium SSD (P-series); Standard HDD price per GiB = 0.0480 USD/GiB-month; Snapshot data stored = 300 GiB; Snapshot price per GiB = 0.0500 USD/GiB-month; Standard-tier transactions = 4,000 thousands/month; Price per 10,000 transactions = 0.0005 USD
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.
Monthly Cost
= 290.25
Billed Size per Disk
= 512 GiB
Paid-for but Unused
= 112 GiB
Disk Capacity Charge
= 275.25
Snapshot Charge
= 15.00
Transaction Charge
= 0.00
How it works
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.
Formula
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.
- snapped size
- Next fixed disk size at or above your requested GiB
- tier price
- Standard HDD reference price multiplied by the tier factor
- wasted GiB
- Difference between the billed size and the size you asked for
Frequently Asked Questions
How is Azure Managed Disk calculated?
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.
Why does Azure Managed Disk matter?
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.
What values do I need to enter?
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.