Core Web Vitals Score Calculator

Score a page against the three Core Web Vitals thresholds Google uses for ranking.

About Core Web Vitals Score Calculator

Each dimension is scored out of 100 and combined using its normalised weight, so the result stays on a 0-100 scale. The weakest dimension is surfaced separately because a good average routinely hides one failing area. A single page experience number is what gets reported upward, but the weakest-dimension line is what tells you where the next hour of work should go.

Formula

Core Web Vitals Score

Score = Σ (dimension × weight), weights normalised to 1

dimension: Each contributing measure, scored 0-100
weight: Relative importance of that dimension

Worked example

With the default values below, Core Web Vitals Score Calculator returns Score of 82.0. Change any input above and every figure here is recalculated in your browser.

Inputs used

Largest Contentful Paint scoreaccepts 0–100 %: 75 %
Interaction to Next Paint scoreaccepts 0–100 %: 82 %
Cumulative Layout Shift scoreaccepts 0–100 %: 90 %

Results

Score: 82.0 /100
Rating: B — Good
Weakest Dimension: Largest Contentful Paint score
Points to the Next Grade: 8.1
Risk Band: Informational

Step by step

1Values used
2Core Web Vitals Score
3Score= 82.0 /100
4Rating= B — Good
5Weakest Dimension= Largest Contentful Paint score
6Points to the Next Grade= 8.1
7Risk Band= Informational

Assumptions and limits

The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 1 decimal place, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is Core Web Vitals Score calculated?

Score = Σ (dimension × weight), weights normalised to 1 Each dimension is scored out of 100 and combined using its normalised weight, so the result stays on a 0-100 scale. The weakest dimension is surfaced separately because a good average routinely hides one failing area.

Why does Core Web Vitals Score matter?

A single page experience number is what gets reported upward, but the weakest-dimension line is what tells you where the next hour of work should go.

What values do I need to enter?

This calculator takes 3 inputs: Largest Contentful Paint score, Interaction to Next Paint score, Cumulative Layout Shift score. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.