Azure Firewall cost: the deployment fee is the surprise

Quick answer

Azure Firewall bills a fixed deployment fee of about $1.25/hour (roughly $900/month) for Standard, plus about $0.016 per GB processed. Premium is higher, around $1.75/hour. The always-on hourly fee dominates for most workloads, so the firewall is only cost-effective when centralized across many workloads, not per small environment.

Azure Firewall is a managed, stateful network firewall, and its pricing has two parts: a fixed hourly deployment fee and a per-gigabyte data-processing charge. The deployment fee runs whether or not any traffic flows, which is why the bill surprises teams who deploy one per environment.

The deployment fee dominates

Standard Azure Firewall costs about $1.25 per hour just to exist, which is roughly $900 a month before a single packet is processed. Premium, with IDPS and TLS inspection, is around $1.75 per hour. For a small workload that fee alone can exceed the cost of everything it protects.

Data processing is secondary

Dimension	Rate (approximate)
Standard deployment	~$1.25 / hour
Premium deployment	~$1.75 / hour
Data processed	~$0.016 / GB

At about a cent and a half per gigabyte, data processing only matters at very high volume. For most deployments the hourly fee is the whole conversation.

Centralize to justify the fee

Because the deployment fee is fixed, the way to make Azure Firewall cost-effective is to run one in a hub virtual network protecting many spoke workloads, rather than one per environment. Amortized across a dozen workloads the fee is reasonable; on a single small app it is not.

Cheaper alternatives for smaller needs

If you only need basic filtering, network security groups are free and often enough. For outbound-only needs, a NAT gateway plus NSGs can replace a firewall at a fraction of the cost. Reserve Azure Firewall for centralized, multi-workload environments where its features and the shared fee make sense.

FAQ

How much does Azure Firewall cost?

Standard Azure Firewall is about $1.25 per hour (roughly $900 per month) as a fixed deployment fee, plus about $0.016 per GB processed. Premium is around $1.75 per hour. The hourly fee runs whether or not traffic flows.

Why is Azure Firewall so expensive?

Because of the fixed hourly deployment fee, which is about $900 a month before any data processing. For a small workload that fee can exceed the cost of everything the firewall protects, so it is only economical when centralized.

How do I reduce Azure Firewall cost?

Run one firewall in a hub virtual network protecting many spoke workloads rather than one per environment, so the fixed fee is amortized. For basic needs, use free network security groups or a NAT gateway with NSGs instead.

Do I need Azure Firewall or is an NSG enough?

Network security groups are free and handle basic allow and deny rules, which is enough for many workloads. Azure Firewall adds centralized policy, application rules, threat intelligence, and (in Premium) IDPS and TLS inspection, worth its fee only when you need those and can centralize it.

Is Azure Firewall Premium worth the extra cost?

Only if you need its added features: intrusion detection and prevention, TLS inspection, and URL filtering. Premium is around $1.75 per hour versus $1.25 for Standard, so justify it by the security requirement, not by default.

Does C3X estimate Azure Firewall cost?

C3X prices the azurerm_firewall resource from your Terraform, including the fixed deployment fee, so the always-on cost is visible before deploy. Data processing depends on traffic, which you provide as a usage assumption.

What to do next

Catch the deployment fee before you deploy. C3X reads your Terraform and prices Azure Firewall and the rest of your stack against a live catalog. Start with the quickstart.