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Azure Firewall Calculator

Split Azure Firewall cost into its fixed hourly deployment fee and the per-GB data processing charge.

About Azure Firewall Calculator

Azure Firewall has two meters: a fixed hourly deployment fee per firewall instance and a per-GB data processing fee. Because the fixed fee dominates at low volume, the blended cost per GB collapses as you consolidate traffic — one firewall in a hub inspecting all spokes is far cheaper per GB than a firewall in each spoke. The fixed fee is roughly $900 a month per deployment before a single packet is inspected, so idle development firewalls are pure waste and deallocating them overnight is a genuine saving; confirm the Basic, Standard and Premium rates for your region in the Azure pricing calculator.

Formula

Azure Firewall

monthly = deployments × hourly rate × 730 + data processed × per-GB rate; blended cost per GB = total ÷ GB processed.

deployment rate
Fixed hourly charge that applies whether traffic flows or not
data processing
Per-GB charge on everything the firewall inspects, inbound and outbound
blended per GB
Total cost divided by throughput, which falls as utilisation rises

Worked example

With the default values below, Azure Firewall Calculator returns Monthly Cost of $1,953.00. Change any input above and every figure here is recalculated in your browser.

Inputs used

Firewall deploymentsaccepts 1–100 deployments
2 deployments
Deployment rateaccepts 0–50 USD/hour
1.25 USD/hour
Data processedaccepts 0–100,000,000 GB/month
8,000 GB/month
Price per GB processedaccepts 0–5 USD
0.016 USD
Billed hours per monthaccepts 1–744 hours
730 hours
Hours the firewall sits idleaccepts 0–744 hours
300 hours

Results

Monthly Cost
$1,953.00
Deployment Charge
$1,825.00
Data Processing Charge
$128.00
Fixed Share of the Bill
93.4%
Blended Cost per GB
0.2441 USD/GB
Spend While Idle
$750.00
Annual Cost
$23,436.00

Step by step

  1. 1Values used
  2. 2Azure Firewall
  3. 3Monthly Cost= 1,953.00
  4. 4Deployment Charge= 1,825.00
  5. 5Data Processing Charge= 128.00
  6. 6Fixed Share of the Bill= 93.4
  7. 7Blended Cost per GB= $0.2441/GB
  8. 8Spend While Idle= 750.00

Assumptions and limits

  • The result is derived only from the 6 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 4 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 Firewall calculated?

monthly = deployments × hourly rate × 730 + data processed × per-GB rate; blended cost per GB = total ÷ GB processed. Azure Firewall has two meters: a fixed hourly deployment fee per firewall instance and a per-GB data processing fee. Because the fixed fee dominates at low volume, the blended cost per GB collapses as you consolidate traffic — one firewall in a hub inspecting all spokes is far cheaper per GB than a firewall in each spoke.

Why does Azure Firewall matter?

The fixed fee is roughly $900 a month per deployment before a single packet is inspected, so idle development firewalls are pure waste and deallocating them overnight is a genuine saving; confirm the Basic, Standard and Premium rates for your region in the Azure pricing calculator.

What values do I need to enter?

This calculator takes 6 inputs: Firewall deployments, Deployment rate, Data processed, Price per GB processed, Billed hours per month, Hours the firewall sits idle. 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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