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Real AWS NAT Gateway cost includes two components most people forget about: an hourly per-AZ charge and per-GB data processing. This calc compares both against the VPC endpoint alternative so you can decide if you should switch.
Switch saves $68.60/mo (78%). Annualized: $823/yr.
Caveats: cross-AZ data ($0.01/GB) is not modeled. Per-region pricing varies; this uses us-east-1 published rates. The most common scenario where NAT wins is bursty, low-volume egress to many destinations.