The simple “how many square feet is this room” question, answered directly from length and width.
How it works
Multiplying length by width gives the square footage.
What this does not include
This does not include a waste margin or material-box rounding — for ordering flooring material with those adjustments included, use this site’s flooring calculator instead. This tool gives the raw square footage only.
How to use this calculator
- Enter the length and width in feet.
A worked example
A room 20 ft by 15 ft: 20 × 15 = 300 sq ft.
A room 12.5 ft by 10 ft: 125 sq ft.
What the variables mean
| Variable | Meaning |
|---|---|
| Length | Room length in feet |
| Width | Room width in feet |
Edge cases worth knowing
This assumes a simple rectangular space. An L-shaped room or one with alcoves needs to be split into rectangles and summed separately.
A length of zero makes the area zero rather than an error — a degenerate but mathematically valid result, since the calculator only declines when a dimension is genuinely missing.
Frequently asked questions
What’s this commonly used for?
Estimating a room’s size for real estate listings, flooring or paint quotes, and general space planning.
What if my room isn’t a simple rectangle?
Break it into rectangular sections, calculate each separately, and add the totals together — or use this site’s general area calculator for other shapes.
Should I measure wall-to-wall or account for fixtures?
For a basic square footage figure, wall-to-wall measurements are standard; specific project needs (like flooring around cabinets) may require additional adjustments.
