Data Transfer Cost Calculator
Price the wire — the egress ladder from the free 100 GB to the $0.05 tier, band by band.
Data Transfer Cost Calculator
Results recalculate instantly on every keystroke. Nothing you type is transmitted.
What this result does not account for
- Internet egress only — cross-AZ and inter-region named, not computed
- One provider's published ladder (the de-facto benchmark)
In short: 5,000 GB out in a month bills $441.00: the first 100 GB is free and the remaining 4,900 ride the $0.09/GB band. The ladder only gets cheaper past 10 TB — $0.085, then $0.07, then $0.05 past 150 TB — so the wire is one of the few bills that rewards scale. Inbound is always free; the exit is what costs.
Formula
bill = Σ billable GB × band rate (− 100 GB free)
The published internet-egress ladder: the first 100 GB a month is free (account-wide and permanent since the 2025 change), then $0.09/GB through the first 10 TB, $0.085 for the next 40 TB, $0.07 for the next 100 TB, and $0.05 past 150 TB. Transfer in is always free; cross-zone traffic bills $0.01/GB each way and is a different line entirely.
Worked Example
- Enter the month's outbound gigabytes.
- Read the bill and the band the marginal GB lands in.
- Compare against the CDN offload before accepting the number.
Defaults: $441.00 on 5,000 GB. Drive to 200,000 GB and the four bands stack to $13,882.20 — and the marginal gigabyte reads $0.05, not $0.09.
Strengths & Limits Of This Model
Where this engine is strong
- Four bands stacked exactly — no flat-rate hand-waving
- The free 100 GB line honored on every result
Where it stops
- Regional variants (Singapore and friends) read higher
Practical Use Cases
Egress forecasting
the bill nobody scoped
CDN decisions
the offload math, priced
Multi-cloud audits
where the exit fees hide
Methodology & Editorial Standards
Computation runs in IEEE-754 double precision at full internal precision; rounding to two decimal places occurs strictly at the display layer, so no cumulative drift enters the result. All monetary outputs use accounting presentation — grouped thousands, two decimals, negatives in parentheses — so figures can be transcribed directly into a model or working paper. Division-by-zero and out-of-domain inputs return an em-dash rather than a misleading number.
This engine was reconciled against an independent reference implementation and hand-verified for the worked example above before release. Our full five-stage review process is published on the About Us page.
Disclaimer. This calculator is provided for informational and modelling purposes only and does not constitute financial, tax, legal, medical, or engineering advice. Verify all figures with a qualified professional before acting on them.
Data Transfer Cost Calculator — 8 Expert FAQs
8 analyst-written answers to the questions practitioners actually ask — optimised for voice and answer-engine retrieval.
Is the first 100 GB really free forever?
Yes — since the 2025 pricing change the free allowance is 100 GB a month, aggregated across services and regions, with no expiry. It replaced a 1 GB perk nobody could use.
Why is egress the famous surprise bill?
Because it is charged on the way OUT only, it is metered by the gigabyte, and it applies to every service at once — compute, storage and databases draw the same allowance. A bucket that serves the public internet bills the wire, not the shelf.
What does 5 TB a month cost?
About $441: 4,900 billable GB at $0.09. The same traffic through a CDN's cache reads materially less — the worked 10 TB example is $891 direct versus about $765 through the edge, because S3-to-CDN transfer is free and CDN egress undercuts the direct rate.
What happens past 150 TB?
The marginal gigabyte drops to $0.05. The ladder is one of the few volume discounts that arrives without a negotiation — 200 TB reads $13,882.20, an average of about 6.9 cents a gigabyte.
Do transfers between zones and regions use this ladder?
No — cross-AZ traffic bills $0.01/GB each way (a round trip is two cents) and inter-region runs $0.02–$0.09/GB. Only the trip out to the public internet rides the ladder on this page.
How is this different from the CDN bandwidth page?
That page prices the offload — cache hit rates pulling bytes off the origin. This page prices the raw wire bill the origin (or the CDN) pays either way. Model the cache there, then read the surviving wire bill here.
Why quote the ladder instead of one flat rate?
Because flat-rate quoting is exactly how egress surprises happen — the first band's $0.09 is the number everyone memorizes, and the past-150 TB $0.05 is the number nobody plans for. The ladder is the published truth.
What about the free tier's effect on small sites?
A hundred gigabytes a month is a small site's whole outbound bill — most personal sites and side projects never pay a cent of egress. The bill starts when an audience does.