calculators
Room Area & Perimeter Calculator
Calculate floor area, perimeter, and ceiling area for a rectangular room.
Floor area
14 m²
Perimeter
15 m
Ceiling area
14 m²
How this works
Floor area = length × width. Perimeter = 2 × (length + width).
Worked example
A 4 m by 3.5 m room has 14 m² of floor and ceiling area and a 15 m perimeter.
FAQ
What is the Room Area & Perimeter Calculator used for?
Calculate floor area, perimeter, and ceiling area for a rectangular room. It is intended for quick planning, checking, and everyday decisions.
Can I use the result for a final contract or design?
Use it as a planning estimate. Measure finished internal dimensions; irregular rooms should be split into rectangles.
How can I improve the accuracy?
Use measured quantities, current supplier or lender rates, the correct units, and compare the result with drawings, invoices, or professional advice where the decision is safety-critical.