Property area

Irregular and Multi-section Area Calculator

Add up to four rectangular or triangular property sections. Replace every default with figures that apply to your property and location.

What this calculator estimates

Add up to four rectangular or triangular property sections. It combines the inputs below to produce Total calculated area. Every assumption remains editable so the estimate can reflect the property, financing and location being evaluated.

Worked example

Using the displayed sample assumptions, the calculator produces 1540.00 sq. units. This is an illustration, not a market quote. Change one input at a time to understand what drives the result.

Inputs and assumptions

• Rectangle 1 length — sample input: 40 ft
• Rectangle 1 width — sample input: 30 ft
• Rectangle 2 length — optional — sample input: 20 ft
• Rectangle 2 width — optional — sample input: 15 ft
• Triangle base — optional — sample input: 10 ft
• Triangle height — optional — sample input: 8 ft
• Excluded area — optional — sample input: 0 sq. ft.

How to interpret the result

Confirm the measurement standard required for the assignment. Compare a conservative case with an expected case and keep a record of the assumptions used.

Common mistake to avoid

Do not combine above-grade, below-grade and rentable areas without labels. Local definitions, taxes, lending practices and measurement requirements can materially change the result.

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Reviewed 2026-09-08.