Free Performance Budget Calculator
Calculate your web page performance budget based on target load time and connection speed. Shows recommended byte limits per resource type.
100% client-side - your data never leaves your browser.
1s (excellent)5s10s
Max payload at target
510 KB
on 3G Fast (1.6 Mbps)
Estimated load time
4.0s
950ms over budget
Resource Budgets
30 KB
50 KB
200 KB
300 KB
80 KB
40 KB
Total: 700 KBBudget: 510 KB
HTMLCSSJavaScriptImagesFontsOther
Context
- Estimates assume parallel downloads and 3 round trips for latency
- Real load time depends on server processing, DNS, TLS handshake, and rendering
- Google Core Web Vitals: LCP target is under 2.5 seconds
- HTTP/2 multiplexing reduces round trips vs HTTP/1.1
- Gzip/Brotli compression reduces transfer size by ~70% for text resources
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