Area measurement

RMS Residential Area Calculator

Estimate Alberta Residential Measurement Standard above-grade area from simple level dimensions. Enter exterior dimensions for detached homes or interior-perimeter measurements for attached homes. Report below-grade space separately.

What this calculator estimates

Estimate above-grade residential area using Alberta RMS inputs. It combines the inputs below to produce Estimated RMS above-grade 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 2,208 sq. ft.. This is an illustration, not a market quote. Change one input at a time to understand what drives the result.

Inputs and assumptions

• Main level length — sample input: 40 ft
• Main level width — sample input: 30 ft
• Upper level length — sample input: 36 ft
• Upper level width — sample input: 28 ft
• Other included above-grade area — sample input: 0 sq. ft.
• Open-to-below or excluded area — sample input: 0 sq. ft.
• Below-grade finished area — sample input: 800 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.