Convert square feet to acres and back. Lot dimension calculator, common lot size comparisons, and complete conversion tables for land measurement.
The square feet to acres converter translates between the two most common land area units in the United States. One acre equals exactly 43,560 square feet — a number that comes from the historical definition of an acre as the area a yoke of oxen could plow in one day (one furlong by one chain).
Whether you are evaluating a property listing, zoning a subdivision, or estimating landscaping costs, knowing how to convert between square feet and acres is essential. This tool handles both directions (ft²→acres and acres→ft²) and also provides metric equivalents (m², hectares, km²).
Beyond simple conversion, the calculator shows possible lot dimensions for your acreage, compares your area to common lot sizes from townhouse plots to quarter-sections, and provides a visual scale to put the numbers in context. It is useful for purchase negotiations, permit planning, and communicating lot sizes clearly with contractors and surveyors. This reduces ambiguity when multiple stakeholders review the same parcel data.
Land buyers, real estate agents, developers, and farmers regularly need to convert between square feet and acres. The conversion factor (43,560) is not intuitive, and mental math is error-prone. This tool provides instant conversion with lot dimension planning and visual comparisons. It reduces misunderstandings in pricing and helps teams evaluate land use options with consistent units.
Square Feet to Acres: acres = ft² ÷ 43,560. Acres to Square Feet: ft² = acres × 43,560. Additional: 1 acre = 4,046.86 m² = 0.4047 hectares; 640 acres = 1 mi².
Result: 2 acres (8,712 m², 0.8094 hectares)
87,120 ft² ÷ 43,560 = exactly 2 acres. This is about the size of 1.5 football fields, or a 295 ft × 295 ft square lot.
The acre is one of the oldest surviving measurement units. Originally defined as the amount of land a yoke of oxen could plow in a day, it was standardized to 1 furlong (660 ft) × 1 chain (66 ft) = 43,560 ft². The furlong measured the length a team could plow before resting; the chain was the width of one plow strip. This medieval farming measure remains the legal standard for US land measurement.
The US Public Land Survey System (PLSS), established in 1785, divided land into 6×6 mile townships, each containing 36 sections of 1 square mile (640 acres). Sections subdivide into halves, quarters, and quarter-quarters (40 acres). This system still determines property boundaries across 30 states.
Today, lot sizes vary dramatically by location. Manhattan averages 0.003 acres per housing unit; rural properties can span thousands of acres. Zoning codes specify minimum lot sizes in acres. Agricultural land is valued per acre ($4,080 national average in 2023), and crop insurance, irrigation, and fertilizer applications are all calculated per acre.
Exactly 43,560 square feet. This comes from the definition: 1 acre = 1 chain (66 feet) × 1 furlong (660 feet) = 43,560 ft². A league was 80 chains, explaining why 640 acres = 1 square mile.
0.25 acres = 10,890 square feet. If square, the lot would be about 104 × 104 feet. This is a common suburban lot size, big enough for a standard house with front and back yards.
Measure length and width in feet, multiply to get square feet, then divide by 43,560. Example: 100 ft × 150 ft = 15,000 ft² = 0.344 acres. For irregular shapes, break into rectangles and add.
A football field (including end zones) is 1.32 acres. The playing field without end zones is 1.1 acres. So 1 acre is about 90% of a football field — a useful mental image.
1 hectare = 2.471 acres (or 1 acre = 0.4047 hectares). Hectares are the metric equivalent used internationally. A hectare is about 2.5 times larger than an acre.
A section is 1 square mile = 640 acres. The US rectangular survey system divides land into 36-section townships. A quarter section (160 acres) was the standard homestead allotment.