300
ft²
27.87
m²
0.0069
acres
300
ft²
27.87
m²
0.0069
acres
The Square Footage Calculator quickly determines the area of any rectangular space. Enter the length and width in feet, and the calculator instantly provides the area in square feet, square meters, and acres. This is one of the most essential calculations in construction, real estate, landscaping, and interior design.
Knowing the exact square footage of a room, lot, or structure is critical for estimating materials like flooring, paint, and sod, as well as for comparing property sizes, calculating rent per square foot, and meeting building code requirements.
The area of a rectangle is calculated by multiplying its length by its width:
Area (ft²) = Length (ft) × Width (ft)
The calculator also converts the result into other common area units. To convert square feet to square meters, the area is multiplied by the conversion factor 0.092903 (since 1 square foot equals 0.092903 square meters). To convert to acres, the area is divided by 43,560 (since 1 acre equals 43,560 square feet):
Square Meters = Area (ft²) × 0.092903
Acres = Area (ft²) / 43,560
The square feet result is the standard unit for room sizes, home listings, and material estimates in the United States. The square meters conversion is useful for international specifications and metric-based materials. The acres value is helpful when evaluating land parcels, lots, and larger outdoor areas.
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A 20-by-15-foot living room has 300 square feet of floor area, equivalent to about 27.87 square meters.
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A backyard measuring 80 by 50 feet has 4,000 square feet, which is just under one-tenth of an acre.
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A 300-by-200-foot lot is 60,000 square feet, or approximately 1.38 acres, which is a generous residential building lot in most areas.
For L-shaped or irregularly shaped rooms, divide the space into separate rectangles. Calculate the square footage of each rectangle individually, then add the results together. For example, an L-shaped room can be split into two rectangles, and their areas can be summed for the total square footage.
Linear feet measure length in a single straight line, while square feet measure area (length multiplied by width). For example, a 10-foot-long board is 10 linear feet, but a 10-by-10-foot room is 100 square feet. Materials like fencing and trim are sold by linear feet, while flooring, paint, and carpet are estimated using square feet.
One acre contains exactly 43,560 square feet. For reference, an acre is roughly the size of a football field without the end zones (which is 48,000 square feet). A half-acre lot, a common residential size, is 21,780 square feet.
Roboculator Team
The Roboculator Team explains calculations, planning tools, and practical formulas in clear language for real-life situations.
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