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About this tool
Find the true monthly cost of NAT gateways — hourly charges, per-GB data processing and the internet egress on top.
This calculator computes the true monthly cost of AWS NAT gateways as hourly charge + data processing + internet egress, using the published us-east-1 rates of $0.045 per gateway-hour and $0.045 per GB processed, plus tiered EC2 data-transfer-out starting at $0.09/GB. It is for platform and FinOps engineers who keep finding NAT as a surprise top-five line on the AWS bill and want to see which of the three components is driving it.
Open AWS NAT Gateway Cost Calculator on AltFTool — it loads instantly in your browser.
Enter the values you already know.
Fine-tune the options to match your scenario.
Read the result and use it in your planning or reporting.
Hourly, per-GB processing and the often-forgotten internet egress are summed together.
Shows the blended cost per gigabyte moved so you can compare against PrivateLink at $0.01/GB.
Applies the 100 GB free allowance and the $0.09/$0.085/$0.07/$0.05 volume tiers automatically.
About $32.85 per gateway just to exist — $0.045/hour for 730 hours in us-east-1 — before any traffic. Add $0.045 per GB processed, so a single gateway moving 1 TB a month costs roughly $78, plus internet data-transfer-out if the traffic leaves AWS.
Because every gigabyte pays twice: $0.045/GB NAT data processing and, when it exits to the internet, data-transfer-out starting at $0.09/GB — about $0.135/GB combined. High-volume flows such as container image pulls, package downloads and S3 access routed through NAT multiply quickly.
Yes — S3 traffic routed through a NAT gateway pays the $0.045/GB processing charge even though S3 transfer within the region is free. A gateway VPC endpoint for S3 or DynamoDB is free of charge and removes that cost entirely, which is the single most common NAT saving.
For production, AWS recommends one per AZ so an AZ failure does not take out egress and you avoid cross-AZ data charges to reach the gateway. Each extra gateway adds about $32.85/month in hourly cost, so dev and test environments often share a single gateway to save money.
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