Square Footage Calculator
Use this free square footage calculator to calculate the combined area of multiple rectangular rooms or surfaces. Enter your actual project measurements, waste allowance and material information instead of relying on a generic quantity. Calculations run directly in your browser and require no account or API key.
How to use the Square Footage Calculator
- Choose imperial or metric measurements where available.
- Enter the dimensions of the room, surface, structure or material.
- Add waste, packaging, density or price information when relevant.
- Review the calculated material quantity and round purchasing quantities according to the supplier's actual package size.
Examples
Formula
Rectangle area = length × width. Total area is the sum of all entered rectangles.
Worked example
Add several rooms or surfaces and calculate their combined square footage or square metres.
Frequently asked questions
Is this square footage calculator free?
Yes. It is free to use and does not require an account or paid API.
Should I include extra material for waste?
Usually yes. Cutting, breakage, pattern matching, compaction and job-site conditions can increase actual material use. Choose a waste allowance appropriate for the project and material.
Are material quantities exact?
No. The result is a planning estimate based on your measurements and assumptions. Confirm package coverage, material density, product instructions and job requirements with the supplier or contractor.
Can I use metric measurements?
Yes. The Home & DIY calculators support metric or imperial measurements where those units are relevant.
More home & diy tools
Flooring Calculator
PopularEstimate flooring area, boxes, waste and material cost.
Open tool →Paint Calculator
PopularEstimate wall and ceiling paint, primer, containers, waste and material cost.
Open tool →Tile Calculator
PopularEstimate tile quantity, boxes, grout spacing, waste and cost.
Open tool →Wallpaper Calculator
PopularEstimate wallpaper area, rolls, waste and material cost.
Open tool →