// multi-utility computation suite · offline · instant · precise
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│ [c] calcalyst_ │
│ computation suite │
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build.web-cls Calculator
Calculates a page's Cumulative Layout Shift (CLS) score from the number and magnitude of unstable elements, and rates it against Core Web Vitals thresholds (Good ≤0.1, Poor >0.25). CLS above 0.1 causes visible content jumping — the most common cause is images without explicit dimensions.
Inputs
Impact
Reference formula or conversion factor shown for context.
Distance
Separation between two points or total path length. Check that units are consistent throughout the calculation.
Shifts
Reference formula or conversion factor shown for context.
Results
single shift score
A numerical rating from the scoring model in use.
total CLS
The combined total across all inputs and components.
rating
A standardised quality or risk rating on the applicable scale.