Data Egress Cost Calculator

Egress is the bill you forget to budget

Storage looks cheap until you move data out. Cache at the edge and keep traffic in-region to tame it. Pair with the CDN cost calculator to see the offload.

Egress: the cloud's exit toll

Moving data into clouds is free; moving it out costs $0.05–$0.09/GB. That asymmetry is strategic — egress fees are the moat that makes multi-cloud and migration expensive. A 100TB monthly pipeline to an external analytics stack runs $5,000–$9,000 in egress alone, often exceeding the compute that produced the data. The pressure valves: same-region private links to partner services (cheaper or free), egress-free storage vendors (R2, B2) for content serving, and EU data-portability rules that forced free full-migration egress on the majors — a one-time exit, not an operating mode. Design data flows so bulk bytes stay inside one provider's walls.

How this calculator works

The Data Egress Cost Calculator estimates your monthly bill for moving data out of a cloud provider or CDN. You enter three values: total egress in gigabytes per month, the price per GB your provider charges for outbound transfer, and any free egress allowance included in your plan. It subtracts the free tier from your total egress and multiplies the billable remainder by the per-GB rate, giving a clear monthly figure. The main drivers are simple: how much data leaves your network and the rate you pay, with the free allowance capping the low end.

The key thing to watch is that egress pricing is asymmetric — sending data out usually costs money while ingress is often free, so a chatty API, large downloads, or cross-region traffic can quietly dominate your bill. Use the calculator to compare providers' per-GB rates and free tiers before committing, and to size the impact of caching or a CDN. Even a small rate difference multiplied across terabytes adds up, so knowing your real egress volume is the first step to controlling the cost.

Frequently asked questions

Why is egress so expensive?

Cloud providers make inbound data free to encourage you to store data with them, then charge to take it out. This lock-in pricing means egress often becomes a surprisingly large, hard-to-cut line on the invoice.

How do I reduce egress cost?

Put a CDN in front of user-facing traffic (cached bytes are cheaper), keep chatty services in the same region, compress payloads, and avoid cross-cloud or cross-region shuffling. Egress hides in architecture, not features.