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Page Size Calculator

Estimate page weight with the Page Size Calculator. Paste HTML, add assets, and see total size plus load time on real connections.

Estimate page weight

Paste page HTML, then add external assets. Estimates update live.

Format: filename, size in KB. Comma or space separated.
Paste HTML to see the estimate.
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How the estimate works

Your pasted HTML is measured in bytes, then a gzip factor (~32%) estimates the compressed transfer size, since servers compress text. External assets you list are added on top. The total divided by the chosen connection speed gives the load-time estimate.

Reading the breakdown

The tag census (images, external vs inline scripts, stylesheets, iframes) shows where the weight lives. Images are usually the biggest win: modern formats and responsive sizes often cut page weight in half.

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Page Size Calculator FAQs

Why estimate instead of measuring the live page?
Browsers block cross-site fetching, so a client-side tool cannot download arbitrary URLs. Pasting view-source gives the same HTML bytes the estimate needs.
How accurate is the gzip estimate?
Within a reasonable range for HTML/CSS/JS (typically 25-35% of raw). Already-compressed assets like JPEGs barely shrink; list those at full size.
What is a good page weight?
Under 500 KB is excellent, under 1.5 MB is acceptable, and anything over 3 MB will feel slow on mobile networks.
Does it count cached assets?
No. It estimates a cold load. Repeat visits are faster thanks to browser caching.
Is my HTML uploaded?
No. Everything is measured locally in your browser.
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