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Performance tool
Website image size calculator
See how image choices affect page weight before publishing them. Add image count, average file size and a connection speed to estimate transfer time.
Private by design. Your entries stay in this browser and are not sent to WebHostGB.
How the result is worked out
A useful guide, with the assumptions visible
Transfer time divides total image payload by connection throughput and adds a modest network overhead. Real pages also load HTML, CSS, fonts and scripts.
Common questions
About this website image size calculator
What size should a website image be?
There is no single answer. Serve the smallest dimensions and quality that still look good in the actual layout, with responsive variants where useful.
Are WebP and AVIF always better?
They often reduce size, but compare visual quality and browser support, and keep an appropriate fallback where necessary.
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