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Azure CDN Cost Calculator

Price Azure CDN or Front Door egress and requests, and value the origin bandwidth your cache hit ratio saves.

About Azure CDN Cost Calculator

A CDN replaces expensive origin egress with cheaper edge egress, but only for the fraction it can cache — every miss pays both the CDN rate and the origin egress rate for the same byte. That makes the cache hit ratio the single most important input: at 92% the double-charged share is small, at 50% the CDN can cost more than serving directly. Cache-control headers and query-string handling are what actually move the hit ratio, so tuning them is a cost lever rather than a performance nicety; CDN egress is priced by geographic zone and volume band, so confirm the rates for the regions your users are in with the Azure pricing calculator.

Formula

Azure CDN Cost

origin traffic = delivered GB × (1 − cache hit ratio); monthly = delivered GB × CDN price + origin GB × origin egress price + requests ÷ 10,000 × request price + base fee.

cache hit ratio
Share of requests served from the edge without touching the origin
origin fetch
Egress the origin still pays for every cache miss
blended per GB
Total divided by delivered bytes, the number to compare against direct egress

Worked example

With the default values below, Azure CDN Cost Calculator returns Monthly Cost of $2,286.42. Change any input above and every figure here is recalculated in your browser.

Inputs used

Data delivered to clientsaccepts 0–100,000 TB/month
20 TB/month
CDN egress price per GBaccepts 0–5 USD
0.081 USD
Cache hit ratioaccepts 0–100 %
92 %
Origin egress price per GBaccepts 0–5 USD
0.087 USD
Requestsaccepts 0–10,000,000 millions/month
500 millions/month
Price per 10,000 requestsaccepts 0–5 USD
0.009 USD
Profile base feeaccepts 0–5,000 USD/month
35 USD/month

Results

Monthly Cost
$2,286.42
CDN Egress Charge
$1,658.88
Origin Fetch Charge
$142.54
Request Charge
$450.00
Traffic Still Reaching the Origin
1,638 GB
Saving vs Serving Everything from the Origin
$0.00
Blended Cost per Delivered GB
0.1116 USD/GB

Step by step

  1. 1Values used
  2. 2Azure CDN Cost
  3. 3Monthly Cost= 2,286.42
  4. 4CDN Egress Charge= 1,658.88
  5. 5Origin Fetch Charge= 142.54
  6. 6Request Charge= 450.00
  7. 7Traffic Still Reaching the Origin= 1,638 GB
  8. 8Saving vs Serving Everything from the Origin= 0.00

Assumptions and limits

  • The result is derived only from the 7 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 Azure CDN Cost calculated?

origin traffic = delivered GB × (1 − cache hit ratio); monthly = delivered GB × CDN price + origin GB × origin egress price + requests ÷ 10,000 × request price + base fee. A CDN replaces expensive origin egress with cheaper edge egress, but only for the fraction it can cache — every miss pays both the CDN rate and the origin egress rate for the same byte. That makes the cache hit ratio the single most important input: at 92% the double-charged share is small, at 50% the CDN can cost more than serving directly.

Why does Azure CDN Cost matter?

Cache-control headers and query-string handling are what actually move the hit ratio, so tuning them is a cost lever rather than a performance nicety; CDN egress is priced by geographic zone and volume band, so confirm the rates for the regions your users are in with the Azure pricing calculator.

What values do I need to enter?

This calculator takes 7 inputs: Data delivered to clients, CDN egress price per GB, Cache hit ratio, Origin egress price per GB, Requests, Price per 10,000 requests, Profile base fee. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.

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Azure CDN Cost Calculator | Calcrivo