Room Area Calculator
Calculate rectangular room area in common metric or imperial units.
Enter your values
Use the fields below, then select Calculate. Your result appears immediately on this page.
How to use the Room Area Calculator
Enter the rectangular room length and width and choose the unit. The calculator returns area in the selected unit squared and also gives a square-metre equivalent.
Formula / calculation logic
Area = Length × Width.
Worked example
A room 5 m long and 4 m wide has an area of 20 m².
Important notes
For irregular rooms, divide the floor into rectangles and add the areas, or use a more detailed floor-plan method.
Frequently asked questions
Can I use feet?
Yes. Common metric and imperial length units are supported.
Does it calculate wall area?
No. This tool calculates a rectangular floor/plan area; use the Paint Calculator for wall coverage estimates.