Plan before you buy
Get the right amount.
Skip the guesswork.
Quick material estimates for paint, flooring, concrete, mulch, and square footage.
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Choose a project
Select one, add your measurements, and use the estimate as your shopping guide.
How to calculate square footage
Measure length and width in feet, then multiply them. For example, a 12-foot by 10-foot room is 120 square feet. The calculator also returns perimeter, which can help estimate trim, edging, or baseboard length.
Area and perimeter formulas
Area = length × width
Perimeter = 2 × (length + width)
Measure an irregular room
- Sketch the room and divide it into rectangles.
- Measure the length and width of each rectangle.
- Calculate each area separately.
- Add the results for total square footage.
Convert inches to feet
Divide the inch measurement by 12 before using the calculator. For example, 6 inches is 0.5 feet. Measure consistently and do not mix feet and inches in the same entry.