Room area calculator
Get to know your space. Measure one room. Or bring the whole home together.
Your measurements
How this calculation works
A worked example
A 4 × 3 m room with a 1 m² fixed exclusion contributes 11 m². A second 2.5 × 2 m room adds 5 m². The total is 16 m².
Before you buy
Split L-shaped rooms into non-overlapping rectangles. Measure each at floor level and record dimensions consistently. The diagram shows the first rectangle and is proportional, not a survey or installation drawing. Deductions change area but not the shape shown.
A few useful answers
Can I enter inches?
Use decimal feet in imperial mode: 6 inches is 0.5 ft. Switching units converts existing dimensions rather than relabeling them.
Are my results saved?
Use Add to project to keep material estimates in your browser. You can copy results or print them at any time. No account or remote project storage is used.
Are the defaults product recommendations?
No. They are transparent example assumptions. Replace coverage, sizes, prices and allowances with your actual product details.