Page weight budget calculator
Enter the size of each asset category and this tool totals your page weight, estimates load time across connection speeds, and tells you whether you are inside a healthy budget.
Fill in the fields and press Calculate to see your result.
A performance budget agreed before design starts is worth more than any optimisation done afterwards. This tool gives you the number to agree on.
A sensible budget
Under 1MB total is a good target for a content page. Images should not exceed roughly 60% of the total, JavaScript should stay under 300KB compressed, and third-party scripts deserve the harshest scrutiny of all because they deliver the least value per kilobyte.
Test on the network your visitors actually use
Around 60% of visits arrive on mobile. Judging your site on office fibre is how 4MB pages get shipped.
Frequently asked questions
Open your browser developer tools, go to the Network tab, disable cache and reload. The total transferred figure at the bottom is your real page weight.
Indirectly but significantly. It drives Largest Contentful Paint, which is a Core Web Vitals metric and a ranking signal.
Related tools
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