Floor Plan Calculator - Calculate Total Project Area

Calculate the total area of a floor plan by adding multiple rooms and complex shapes (rectangles, L-shapes). Get accurate square footage/meters for flooring, painting, or DIY projects.

Full original guide (expanded)

Audit: Complete

Formula (LaTeX) + variables + units

This section shows the formulas used by the calculator engine, plus variable definitions and units.

Formula (extracted LaTeX)

\[Area = \text{Length} \times \text{Width}\]

Area = \text{Length} \times \text{Width}

Formula (extracted LaTeX)

\[Area_{L-shape} = (\text{Length}_A \times \text{Width}_A) + (\text{Length}_B \times \text{Width}_B)\]

Area_{L-shape} = (\text{Length}_A \times \text{Width}_A) + (\text{Length}_B \times \text{Width}_B)

Formula (extracted text)

$ Area = \text{Length} \times \text{Width} $

Formula (extracted text)

$ Area_{L-shape} = (\text{Length}_A \times \text{Width}_A) + (\text{Length}_B \times \text{Width}_B) $

Variables and units

No variables provided in audit spec.

Sources (authoritative):

ISO 9836:2017 - Performance standards in building — Definition and calculation of area and space indicators — iso.org · Accessed 2026-01-19
https://www.iso.org/standard/66610.html
Home — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/
Construction DIY — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/construction-diy
Paint Calculator — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/paint-calculator
Concrete Slab Calculator — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/concrete-slab-calculator

Changelog

Version: 0.1.0-draft
Last code update: 2026-01-19

0.1.0-draft · 2026-01-19

Initial audit spec draft generated from HTML extraction (review required).
Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
Confirm sources are authoritative and relevant to the calculator methodology.

Verified by Ugo Candido on 2026-01-19
Profile · LinkedIn

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Audit: Complete

Formula (LaTeX) + variables + units

This section shows the formulas used by the calculator engine, plus variable definitions and units.

Formula (extracted LaTeX)

\[Area = \text{Length} \times \text{Width}\]

Area = \text{Length} \times \text{Width}

Formula (extracted LaTeX)

\[Area_{L-shape} = (\text{Length}_A \times \text{Width}_A) + (\text{Length}_B \times \text{Width}_B)\]

Area_{L-shape} = (\text{Length}_A \times \text{Width}_A) + (\text{Length}_B \times \text{Width}_B)

Formula (extracted text)

$ Area = \text{Length} \times \text{Width} $

Formula (extracted text)

$ Area_{L-shape} = (\text{Length}_A \times \text{Width}_A) + (\text{Length}_B \times \text{Width}_B) $

Variables and units

No variables provided in audit spec.

Sources (authoritative):

ISO 9836:2017 - Performance standards in building — Definition and calculation of area and space indicators — iso.org · Accessed 2026-01-19
https://www.iso.org/standard/66610.html
Home — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/
Construction DIY — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/construction-diy
Paint Calculator — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/paint-calculator
Concrete Slab Calculator — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/concrete-slab-calculator

Changelog

Version: 0.1.0-draft
Last code update: 2026-01-19

0.1.0-draft · 2026-01-19

Initial audit spec draft generated from HTML extraction (review required).
Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
Confirm sources are authoritative and relevant to the calculator methodology.

Verified by Ugo Candido on 2026-01-19
Profile · LinkedIn

]], displayMath: [['\\[','\\]']] }, svg: { fontCache: 'global' } };

Audit: Complete

Formula (LaTeX) + variables + units

This section shows the formulas used by the calculator engine, plus variable definitions and units.

Formula (extracted LaTeX)

\[Area = \text{Length} \times \text{Width}\]

Area = \text{Length} \times \text{Width}

Formula (extracted LaTeX)

\[Area_{L-shape} = (\text{Length}_A \times \text{Width}_A) + (\text{Length}_B \times \text{Width}_B)\]

Area_{L-shape} = (\text{Length}_A \times \text{Width}_A) + (\text{Length}_B \times \text{Width}_B)

Formula (extracted text)

$ Area = \text{Length} \times \text{Width} $

Formula (extracted text)

$ Area_{L-shape} = (\text{Length}_A \times \text{Width}_A) + (\text{Length}_B \times \text{Width}_B) $

Variables and units

No variables provided in audit spec.

Sources (authoritative):

ISO 9836:2017 - Performance standards in building — Definition and calculation of area and space indicators — iso.org · Accessed 2026-01-19
https://www.iso.org/standard/66610.html
Home — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/
Construction DIY — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/construction-diy
Paint Calculator — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/paint-calculator
Concrete Slab Calculator — calcdomain.com · Accessed 2026-01-19
https://calcdomain.com/concrete-slab-calculator

Changelog

Version: 0.1.0-draft
Last code update: 2026-01-19

0.1.0-draft · 2026-01-19

Initial audit spec draft generated from HTML extraction (review required).
Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
Confirm sources are authoritative and relevant to the calculator methodology.

Verified by Ugo Candido on 2026-01-19
Profile · LinkedIn

Formulas

(Formulas preserved from original page content, if present.)

Version 0.1.0-draft

Citations

Add authoritative sources relevant to this calculator (standards bodies, manuals, official docs).

Changelog

0.1.0-draft — 2026-01-19: Initial draft (review required).