Dev & engineering · free calculator
Cloud egress cost calculator
Project monthly cloud egress (data transfer out) cost across AWS / GCP / Azure pricing tiers, plus break-even point for CDN deployment.
Monthly cloud egress cost
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- Monthly CDN cost$712
- Monthly savings with CDN$1,515
- CDN break-even (months)0.0
Cloud egress — the $80k surprise
The single most surprising line item in cloud bills. Storing data is cheap. Sending it OUT to users (egress) is brutally expensive: $0.05-0.09/GB at every major cloud, with steep tiered rates that punish high-volume use.
The tiered math
AWS data transfer out:
- 0-10 TB/month: $0.09/GB
- 10-50 TB/month: $0.085/GB
- 50-150 TB/month: $0.07/GB
- 150+ TB/month: $0.05/GB
A 25 TB/mo workload costs ~$2,200/mo at AWS. At 250 TB/mo, $14,000/mo.
CDN as the lever
Modern CDNs (Cloudflare, Bunny, Fastly) offer egress at a tiny fraction of cloud cost:
- Cloudflare R2: $0.045/GB out (often free with Workers)
- Bunny.net: $0.005-0.04/GB depending on region
- Fastly: $0.06-0.12/GB (highest)
The break-even is almost immediate. A 25 TB/mo workload that costs $2,200/mo at AWS becomes $700/mo on Bunny — $1,500/mo savings, $18k/yr.
What this calc misses
- Inter-region traffic: $0.02-0.04/GB on top of egress for cross-region replicas
- API call costs: not in egress — separate rate
- CDN cache miss costs: when CDN can't serve from cache, you still pay origin egress
- CDN bandwidth overage charges: most CDN tiers have soft caps; over the cap = price spike
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