How does the Insulation Calculator work?

Calculate area to be insulated (m²) Then: Determine required R-value or U-value based on building regulations and climate zone Then: Select insulation type: mineral wool, PIR foam, cellulose, spray foam Then: Quantity = area / coverage per roll or bag (listed on product label).

Can you give an example of how to use the Insulation Calculator?

Example: Input Loft 50m² · 270mm mineral wool to achieve Part L compliance gives a result of ~6 rolls (large rolls cover 8.5m²) (UK Part L requires ~0.16 W/m²K for lofts).

Is the Insulation Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Insulation Calculator?

Our Insulation Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Insulation Calculator

Insulation type

Area length (m)

Area width (m)

An insulation calculator estimates the amount of insulation material (rolls, batts, or loose fill) needed for walls, loft/attic, or floor, and the expected energy savings or U-value improvement.

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Did You Know?

Loft insulation is one of the highest-ROI home improvements — UK Energy Saving Trust estimates savings of £300–400/year, with payback often under 2 years.

References

›Building insulation — Wikipedia

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