Free tool · Nigeria
Square Meter Calculator (m²)
Calculate net floor or wall area in square metres before you order tiles, paint, plaster, or screed. Deduct openings using preset Nigerian door and window sizes or custom dimensions.
Square Meter Calculator (m²)
Instant Sqm calculator and optionally deduct for all openings using common Nigerian sizes.
Calculation Results
Save this estimate to your project
Create a free RazorBuilder account to store quantities, build a BOQ, and track materials on site.
Assumptions
- Areas are based on the dimensions you enter — always cross-check against site measurements.
- Opening presets reflect common local sizes; custom openings can be added row by row.
- Net area is before material wastage — add wastage when ordering finishes.
Worked example
A room 4.2 m × 3.9 m with one 900 × 2100 door and one 1200 × 1200 window yields a lower net wall or floor area than the gross rectangle — use the net figure for finishes.
Related resources
Need this on every job?
RazorBuilder stores calculator outputs in your project, turns quantities into BOQ lines, and tracks materials on site — so you are not re-typing the same wall or slab every week.