Cloud Bill Estimator (AWS / GCP / Azure)

$30/mo solo project. $300/mo growing SaaS. The line that surprises everyone: egress at $0.09/GB. Run your stack — see what the bill becomes.

Where AWS bills come from

Five line items dominate every developer-tier AWS / GCP / Azure bill. In rough order of "creates surprise bills":

  • Egress: $0.09/GB direct internet on AWS. A 100GB/month side project is $9 — fine. A 5TB viral moment is $450 — not fine. Always put user-facing traffic through CDN.
  • NAT Gateway (not modeled here): $0.045/hour + $0.045/GB processed. Easy to leave running over a weekend on autoscaling — common $200+ surprise.
  • Compute: predictable, easy to right-size. 30% RI discount on a 1-year commit is the easiest savings move.
  • Managed database: $50/mo flat plus storage. Free hobby tiers (Supabase, Neon, PlanetScale) cover early-stage; managed makes sense once you have backups, replicas, point-in-time-restore needs.
  • Storage: cheap per-GB but accumulates. Old logs, build artifacts, abandoned uploads — review quarterly.

Math runs locally. Inputs never leave your browser. Source on github.

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$30/Month AWS Bill Becomes $480 the Week Your Side Project Goes Viral (the Egress Trap)
Egress at $0.09/GB is the line that destroys hobbyist AWS bills. 5 TB of viral traffic is $450. We modeled the typical SaaS stack from solo project to growth, and the egress line is what surprises every founder.
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