Website Speed Budget Calculator
Developer utilities: formatters, validators, encoders, and testers.
What does this tool do?
Set a performance budget for your website. Enter the size of your HTML, CSS, JavaScript, images and fonts to see total page weight, estimated load times on real networks, and whether you pass a healthy budget.
Key features
- Syntax validation
- Format & minify
- Error highlighting
- Copy formatted output
Set a performance budget for your website. Enter the size of your HTML, CSS, JavaScript, images and fonts to see total page weight, estimated load times on real networks, and whether you pass a healthy budget.
Page Assets (KB)
Budget Verdict
Estimated Load Times
Estimates use simple transfer math (size / bandwidth) and ignore latency, so real times will be a bit higher.
How to Use
- Enter the kilobyte size of each asset type (check your browser devtools Network tab for real numbers).
- Read the budget verdict grade and the animated weight bar instantly.
- Compare estimated load times across Slow 3G, 4G and broadband.
Core Features
- Instant total page-weight calculation across 6 asset types
- Realistic load-time estimates on 4 common network speeds
- A+ to F performance grade with actionable advice
- 100% client-side - no page scans, no external requests
Frequently Asked Questions
How do I find my real asset sizes?
Open your site in Chrome, press F12, go to the Network tab, reload the page, and look at the transferred sizes per resource type at the bottom of the panel.
Is 1000 KB a strict rule?
It is a widely used healthy target for mobile, not a hard rule. Content-heavy sites can exceed it, but every extra megabyte measurably increases bounce rates on slow networks.
How to Use Website Speed Budget Calculator
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