Core Web Vitals Budget Calculator
Check LCP, INP and CLS against budgets.
Runs in your browser. Nothing is uploaded — your input is processed on this device and discarded when you close the tab.
Core Web Vitals Budget Calculator
How to use this tool
- Enter your values in the fields above.
- Press Generate to see the result.
- Use Load sample to try the worked example, Copy result to copy it, or Clear to start again.
Worked example
The sample values LCP 1800 ms, INP 150 ms and CLS 0.05 all pass their budgets (2500 ms, 200 ms and 0.1), so the overall result is Pass.
What this tool does not do / Limits
This checks numbers you enter against standard budgets. It does NOT measure a live site; the values must come from a real performance test.
Frequently asked questions
What are the budget limits?
LCP 2500 ms or less, INP 200 ms or less, and CLS 0.1 or less.
What if one value fails?
The overall result is Fail, because all three budgets must pass together.
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