Area & materials

Calculate square metres and estimated material for building, paint and flooring.

Zones and cut-outs

Add spaces and mark doors, windows or areas without material as cut-outs.

Zone 1
Optional price

UNDERSTAND THE HOW

More than a result. An explanation.

Starts from a rectangle and applies a material allowance according to the selected mode.

A = largo × ancho
Assumptions and limitations

Planning estimate. Always verify coverage, packaging and prices with the supplier specification.

A simple example

A 5 × 4 m room has 20 m² before subtracting openings.

Are my inputs stored?

No. Processing stays in your browser. Only tool IDs and timestamps are kept in your recent history; password generation is excluded.

Formula visible · Updated September 8, 2026

Methods, limitations and contact

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