Estimate the bandwidth and latency saving from an image CDN.
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.
Image CDN Savings
Saved bandwidth = visits × (original weight − optimised weight)
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.
Image CDNs handle format negotiation per browser automatically, which is otherwise a build and markup burden on every image.
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.