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Image CDN Savings Calculator

Estimate the bandwidth and latency saving from an image CDN.

About Image CDN Savings Calculator

An image CDN delivers two independent benefits: automatic format and size optimisation, and lower latency from edge delivery. The optimisation saving is usually the larger of the two. Image CDNs handle format negotiation per browser automatically, which is otherwise a build and markup burden on every image.

Formula

Image CDN Savings

Saved bandwidth = visits × (original weight − optimised weight)

automatic optimisation
Format negotiation, resizing and compression at the edge

Worked example

With the default values below, Image CDN Savings Calculator returns Monthly Bandwidth Saved of 54.932. Change any input above and every figure here is recalculated in your browser.

Inputs used

Image weight per pageminimum 0 KB
1,600 KB
Automatic optimisation savingaccepts 0–100 %
45 %
Origin latencyminimum 0 ms
180 ms
CDN edge latencyminimum 0 ms
30 ms
Monthly visitsminimum 0
80,000

Results

Monthly Bandwidth Saved
54.932 GB
Optimised Image Weight
880.0 KB
Latency Saved per Request
150 ms
Original Monthly Bandwidth
122.070 GB
Bandwidth Reduction
45.00%

Step by step

  1. 1Values used
  2. 2Image CDN Savings
  3. 3Monthly Bandwidth Saved= 54.932 GB
  4. 4Optimised Image Weight= 880.0 KB
  5. 5Latency Saved per Request= 150 ms
  6. 6Original Monthly Bandwidth= 122.070 GB
  7. 7Bandwidth Reduction= 45.00

Assumptions and limits

  • The result is derived only from the 5 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 3 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 Image CDN Savings calculated?

Saved bandwidth = visits × (original weight − optimised weight) An image CDN delivers two independent benefits: automatic format and size optimisation, and lower latency from edge delivery. The optimisation saving is usually the larger of the two.

Why does Image CDN Savings matter?

Image CDNs handle format negotiation per browser automatically, which is otherwise a build and markup burden on every image.

What values do I need to enter?

This calculator takes 5 inputs: Image weight per page, Automatic optimisation saving, Origin latency, CDN edge latency, Monthly visits. 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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Image CDN Savings Calculator | Calcrivo