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Data Egress Cost Calculator

Price internet egress through the tiered per-GB bands, with CDN offload and cross-zone traffic counted separately.

About Data Egress Cost Calculator

Egress is priced as a step ladder, not a single rate: only the gigabytes that fall inside a band are charged at that band's price, so the marginal rate falls as volume grows while the average lags behind it. CDN traffic leaves the ladder entirely and is billed at CDN rates, which is why offload changes the shape of the bill and not just its size. Egress is the meter that scales with your users rather than your architecture, and it is the one most often missing from a cost model until the first busy month arrives. Rates and band boundaries vary by provider and region, so treat the defaults as a starting point and confirm them on your own invoice.

Formula

Data Egress Cost

billable = origin GB − free allowance; cost = Σ (GB falling in each band × that band's rate) + CDN GB × CDN rate + cross-zone GB × cross-zone rate.

band
A tier of the egress price ladder, cut at 10 TB, 50 TB and 150 TB
blended rate
Total transfer cost divided by every gigabyte moved
cross-zone
Traffic between availability zones, billed even though it never leaves the region

Worked example

With the default values below, Data Egress Cost Calculator returns Monthly Data Transfer Cost of $5,092.20. Change any input above and every figure here is recalculated in your browser.

Inputs used

Internet egress per monthaccepts 0–50,000,000 GB
60,000 GB
Free tier allowanceaccepts 0–100,000 GB
100 GB
Rate for the first 10 TBaccepts 0–5 USD/GB
0.09 USD/GB
Rate for the next 40 TBaccepts 0–5 USD/GB
0.085 USD/GB
Rate for the next 100 TBaccepts 0–5 USD/GB
0.07 USD/GB
Rate beyond 150 TBaccepts 0–5 USD/GB
0.05 USD/GB
Traffic served through a CDNaccepts 0–100 %
0 %
CDN egress rateaccepts 0–5 USD/GB
0.085 USD/GB
Cross-zone traffic inside the regionaccepts 0–50,000,000 GB
8,000 GB
Cross-zone rateaccepts 0–5 USD/GB
0.01 USD/GB

Results

Monthly Data Transfer Cost
$5,092.20
Blended Rate per GB
$0.0749
Billable Origin GB
59,900 GB
Origin Internet Egress
$5,012.20
CDN Egress
$0.00
Cross-Zone Transfer
$80.00
Annual Data Transfer Cost
$61,106.40
Highest Tier Reached
The 50 TB to 150 TB band

Step by step

  1. 1Values used
  2. 2Data Egress Cost
  3. 3Monthly Data Transfer Cost= 5,092.20
  4. 4Blended Rate per GB= 0.0749
  5. 5Billable Origin GB= 59,900 GB
  6. 6Origin Internet Egress= 5,012.20
  7. 7CDN Egress= 0.00
  8. 8Cross-Zone Transfer= 80.00

Assumptions and limits

  • The result is derived only from the 10 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 4 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

How is Data Egress Cost calculated?

billable = origin GB − free allowance; cost = Σ (GB falling in each band × that band's rate) + CDN GB × CDN rate + cross-zone GB × cross-zone rate. Egress is priced as a step ladder, not a single rate: only the gigabytes that fall inside a band are charged at that band's price, so the marginal rate falls as volume grows while the average lags behind it. CDN traffic leaves the ladder entirely and is billed at CDN rates, which is why offload changes the shape of the bill and not just its size.

Why does Data Egress Cost matter?

Egress is the meter that scales with your users rather than your architecture, and it is the one most often missing from a cost model until the first busy month arrives. Rates and band boundaries vary by provider and region, so treat the defaults as a starting point and confirm them on your own invoice.

What values do I need to enter?

This calculator takes 10 inputs: Internet egress per month, Free tier allowance, Rate for the first 10 TB, Rate for the next 40 TB, Rate for the next 100 TB, Rate beyond 150 TB, Traffic served through a CDN, CDN egress rate, Cross-zone traffic inside the region, Cross-zone rate. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.

Why is cross-zone traffic listed separately?

It never touches the internet, so it does not consume the free allowance or the tiered ladder, but most providers still charge roughly a cent per gigabyte in each direction. A chatty service spread across three zones can spend more on cross-zone transfer than on internet egress.

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