Square Footage Calculator
Calculate area for rooms, yards, floors, walls, and irregular project shapes
Extra material for cuts and mistakes.
Optional price per selected area unit.
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How Square Footage Is Calculated
Pick the shape that matches your project, enter dimensions in one unit, then add material waste if needed.
Area formulas
Rectangles use length by width. Circles use pi times radius squared. Triangles and trapezoids use their standard base-height formulas. L-shapes subtract a rectangular cutout from the outer rectangle.
Unit conversions
Dimensions can be entered in inches, feet, yards, meters, or centimeters. Results are normalized to square feet and also shown in square yards, square meters, and acres.
Waste allowance
Flooring, tile, turf, paint, and panel projects often need extra material for cuts, patterns, damaged pieces, and layout mistakes. Adjust the percentage to match the job.
Shape-specific square footage calculators
Square Footage Examples
Quick reference estimates for common area and material planning tasks.
Square Footage Calculator FAQ
Practical answers for measuring rooms, converting units, and planning materials.
How do I calculate square footage?
For a rectangular area, multiply length by width. For other shapes, use the matching area formula, then convert the result to square feet if the dimensions were entered in another unit.
What is the difference between square feet and linear feet?
Square feet measure area: length times width. Linear feet measure one straight length. Flooring, paint coverage, turf, and roofing usually need area, while trim and edging often use linear feet.
How much extra material should I add?
A 5% to 10% waste allowance is common for many simple flooring or surface projects. Use more for diagonal layouts, patterned cuts, irregular rooms, mistakes, or fragile materials.
Can I use meters or inches?
Yes. Choose the unit used for your measurements. The calculator converts the area to square feet, square yards, square meters, and acres for comparison.
Does the cost estimate include labor?
No. The cost estimate multiplies total square feet after waste by the material price per square foot. It does not include labor, adhesive, underlayment, delivery, taxes, or contractor markups.