Azure Firewall Calculator

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

Inputs

Firewall deploymentsdeployments

One per hub or per region — each is billed separately.

Deployment rateUSD/hour

Standard list rate; Basic and Premium differ.

Data processedGB/month

Price per GB processedUSD

Billed hours per monthhours

Hours the firewall sits idlehours

Non-production firewalls are billed while idle unless deallocated.

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

0.2441USD/GB

Spend While Idle

$750.00

Annual Cost

$23,436.00

Step by step

Values used
Firewall deployments = 2 deployments; Deployment rate = 1.25 USD/hour; Data processed = 8,000 GB/month; Price per GB processed = 0.0160 USD; Billed hours per month = 730 hours; Hours the firewall sits idle = 300 hours
Azure Firewall
monthly = deployments × hourly rate × 730 + data processed × per-GB rate; blended cost per GB = total ÷ GB processed.
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

How it works

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

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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