CalHub

Square Footage Calculator

Calculate the area of a room or surface in square feet (and cost).

Total area 120
Area (yd²) 13.333
Area (acres) 0.0028
Total cost ($) 0

Formula: area = length (ft) × width (ft) × number of areas

Step-by-step with your numbers:
1. Values used:
2. Length = 12
3. Width = 10
4. Number of areas = 1
5. Price per ft² = 0 $
6.
7. Total area = Length x Width = 12 x 10 = 120
8. Area = 13.333yd²
9. Area = 0.0028acres
10. Total cost = 0$
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Find the square footage of any rectangular room, wall, lawn or surface. Square footage is the most common unit for flooring, paint, tiling and real-estate pricing.

The math behind it

For a rectangle: area = length × width.

Useful conversions: 1 yd² = 9 ft², and 1 acre = 43,560 ft².

For an L-shaped space, split it into rectangles, calculate each, and add them — or set 'number of areas'.

Worked example

A room 12 ft × 10 ft → area = 12 × 10 = 120 ft² = 13.33 yd².

FAQ

How do I measure an irregular room?

Break it into rectangles, find each area, then add them together.

How many square feet in an acre?

43,560 square feet.

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Square Yards Calculator Convert a length and width into square yards — handy for carpet and turf. Flooring Calculator Estimate the boxes of flooring needed for a room, with waste. Paint Calculator Estimate gallons of paint for walls, including multiple coats.