Square Footage Calculator
Multiply length × width to find square feet for any rectangular area.
Multiply length × width to find square feet for any rectangular area.
Formula: Length (ft) × Width (ft) = Square feet. Decimals like 12.5 work fine.
Divide your space into two rectangles and add them together.
| Material | Waste factor | Why |
|---|---|---|
| Hardwood / LVP (straight lay) | +10% | Standard cuts and edge waste |
| Tile (straight lay) | +10% | Cuts at walls and obstacles |
| Tile (diagonal lay) | +15% | More cuts, more corner waste |
| Herringbone / chevron | +15% | Pattern alignment increases cuts |
| Carpet | +10–15% | Seam placement and direction |
| Outdoor / irregular space | +15–20% | Non-rectangular cuts and fit |
144 square feet. A 12×12 room is the most common bedroom size in the US. For flooring, order about 158 sq ft (144 + 10% waste).
100 square feet. Common for small bedrooms, home offices, and storage rooms. Order about 110 sq ft of flooring material.
400 square feet. Typical for large living rooms, garages, or open plan spaces. Order about 440 sq ft of flooring with 10% waste.
Divide the room into two rectangles. Calculate each section separately, then add them. Use the L-shaped room calculator above — enter both sections and it totals them automatically.
Order 10% extra for straight-lay patterns. Order 15% extra for diagonal tile, herringbone, or chevron. Always buy from the same production batch — dye lots vary, and mismatched flooring is obvious.
Divide square feet by 9. Example: 270 sq ft ÷ 9 = 30 square yards. Carpet is typically sold per square yard, so this conversion matters when ordering.
One acre = 43,560 square feet. To convert your total to acres, divide by 43,560. Example: 87,120 sq ft ÷ 43,560 = 2 acres.
Square footage = Length (ft) × Width (ft). Both measurements must be in feet. If you have inches, divide by 12 first. The calculator above handles decimals — 12.5 ft works fine.