Infrastructure & IaC
NAT Gateway Sizing Calculator
NAT gateways fail in two very different ways, and a capacity plan that protects against one does not automatically protect against the other. Connection tracking limits are reached when many clients hold many long-lived connections at once. New-connections-per-second limits are reached when a burst of short-lived outbound requests overwhelms the session setup path. Four inputs above size the gateway against both failure modes and report the headroom left on each.
Calculations run locally in your browserTool
About this tool
NAT Gateway Sizing Calculator
Size a NAT gateway from concurrent connections, new connections per second, average duration, and burst factor. Browser-only — no data sent.
• Evaluate current state against industry benchmarks
• Identify optimization opportunities
• Support capacity planning and cost decisions
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FAQ
What does this tool tell you?
Size a NAT gateway from concurrent connections, new connections per second, average duration, and burst factor. Browser-only — no data sent.
What affects the result most?
Size a NAT gateway from concurrent connections, new connections per second, average duration, and burst factor. Browser-only — no data sent.
How should I use the result?
The calculation is deterministic — the same inputs always produce the same output — so the most useful workflow is to vary one input at a time and see which factor moves the result most. That tells you where to focus your attention before committing to a decision.
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