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Egress Cost Calculator

Work out egress cost instantly with clear inputs, formula shown and shareable results.

About Egress Cost Calculator

Egress is the most expensive commodity in cloud pricing at around nine cents per gigabyte, roughly a hundred times the cost of storing the same data for a month. A CDN reduces origin egress by its hit ratio and usually charges less per gigabyte itself, so at 80 percent offload the origin bill falls to a fifth even before the CDN's own lower rate is considered.

Formula

Egress cost

origin GB = total GB x (1 - CDN offload); billable = origin GB - free allowance; cost = billable x price per GB

Worked example

With the default values below, Egress Cost Calculator returns Monthly egress cost of $711.00. Change any input above and every figure here is recalculated in your browser.

Inputs used

Data transferred out per monthminimum 0 TB
40 TB
Egress price per GBminimum 0
0.09
Free egress allowanceminimum 0 GB
100 GB
Share served from a CDNaccepts 0–100 %
80 %

Results

Monthly egress cost
$711.00
Billable gigabytes from origin
7,900 GB
Saving from CDN offload
$2,880.00
Cost with no CDN
$3,591.00

Step by step

  1. 1Values used
  2. 2Egress cost
  3. 3Monthly egress cost= 711.00
  4. 4Billable gigabytes from origin= 7,900 GB
  5. 5Saving from CDN offload= 2,880.00
  6. 6Cost with no CDN= 3,591.00

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Why is egress so expensive?

It is priced strategically rather than by cost. Ingress is free, which makes moving data in easy and moving it out costly — the basis of the data gravity concern.

Does cross-availability-zone traffic count?

It is billed separately and usually at a cent or two per gigabyte in each direction. Chatty microservices spread across zones can generate a surprisingly large bill.

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Egress Cost Calculator – Calculate Monthly egress cost