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Azure Files Calculator

Size an Azure file share and derive premium baseline IOPS, burst IOPS and throughput from the provisioned GiB.

About Azure Files Calculator

A premium file share is provisioned, not consumed: you pay for the size you declare and Azure grants performance from that same number, which is why growing the share is also the way to buy IOPS and throughput. Standard shares invert the model — you pay for what you store plus every transaction, but performance is fixed and much lower. Teams hit the IOPS ceiling of a premium share long before they fill it, and the fix is counter-intuitive: provision more GiB. Confirm the per-GiB and per-transaction prices for your region in the Azure pricing calculator, since standard shares also differ by access tier.

Formula

Azure Files

Premium baseline IOPS = 400 + 1 per provisioned GiB (capped at 102,400); burst = max(4,000, 3 × baseline); throughput MiB/s = (40 + 0.04 × GiB) ingress + (60 + 0.06 × GiB) egress.

provisioned GiB
Share size you commit to and pay for, whether used or not
baseline IOPS
Sustained IOPS entitlement scaling linearly with provisioned size
burst IOPS
Credit-backed short-term ceiling, three times baseline

Worked example

With the default values below, Azure Files Calculator returns Monthly Cost of $195.84. Change any input above and every figure here is recalculated in your browser.

Inputs used

Share typeone of Premium (provisioned SSD), Standard (pay-as-you-go HDD)
Premium (provisioned SSD)
Provisioned size (premium)accepts 100–102,400 GiB
1,024 GiB
Premium price per provisioned GiBaccepts 0–10 USD/GiB-month
0.16 USD/GiB-month
Data stored (standard)accepts 0–5,242,880 GiB
800 GiB
Standard price per GiB usedaccepts 0–10 USD/GiB-month
0.0255 USD/GiB-month
Transactions (standard)accepts 0–100,000 millions/month
40 millions/month
Price per 10,000 transactionsaccepts 0–5 USD
0.015 USD
Snapshot data storedaccepts 0–1,000,000 GiB
200 GiB

Results

Monthly Cost
$195.84
Baseline IOPS
1,424 IOPS
Burst IOPS
4,272 IOPS
Total Throughput
202 MiB/s
Capacity Charge
$163.84
Transaction Charge
$0.00

Step by step

  1. 1Values used
  2. 2Azure Files
  3. 3Monthly Cost= 195.84
  4. 4Baseline IOPS= 1,424 IOPS
  5. 5Burst IOPS= 4,272 IOPS
  6. 6Total Throughput= 202 MiB/s
  7. 7Capacity Charge= 163.84
  8. 8Transaction Charge= 0.00

Assumptions and limits

  • The result is derived only from the 8 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is Azure Files calculated?

Premium baseline IOPS = 400 + 1 per provisioned GiB (capped at 102,400); burst = max(4,000, 3 × baseline); throughput MiB/s = (40 + 0.04 × GiB) ingress + (60 + 0.06 × GiB) egress. A premium file share is provisioned, not consumed: you pay for the size you declare and Azure grants performance from that same number, which is why growing the share is also the way to buy IOPS and throughput. Standard shares invert the model — you pay for what you store plus every transaction, but performance is fixed and much lower.

Why does Azure Files matter?

Teams hit the IOPS ceiling of a premium share long before they fill it, and the fix is counter-intuitive: provision more GiB. Confirm the per-GiB and per-transaction prices for your region in the Azure pricing calculator, since standard shares also differ by access tier.

What values do I need to enter?

This calculator takes 8 inputs: Share type, Provisioned size (premium), Premium price per provisioned GiB, Data stored (standard), Standard price per GiB used, Transactions (standard), Price per 10,000 transactions, Snapshot data stored. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.

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