Convert acres to square feet, square meters, and hectares both ways. Free with steps.
Land is bought in acres and built in square feet — and every buyer, builder, and farmer must translate between them. One acre is exactly 43,560 square feet, a number with a medieval pedigree. Our free Acres to Square Feet Converter converts both directions among acres, square feet, square meters, and hectares, showing the square-foot intermediate so each answer is verifiable.
The acre’s odd size is no accident: it was the area a yoke of oxen could plow in a day, later standardized as a furlong (220 yards) by a chain (22 yards) — 4,840 square yards, or 43,560 square feet. The definition is now exact, but the number’s agricultural ghost still haunts every deed and listing.
Use it when a listing says “0.35 acres” and you think in house footprints, when a farm lease quotes per acre and your budget is per square foot, or when comparing a US acreage with a metric hectare (2.471 acres).
The examples below cover the everyday conversions — house lots, farm sections, price-per-foot comparisons — and the FAQ tackles the questions buyers actually ask, from “how many houses fit?” to why the number is 43,560 instead of something round and memorable.
An acre is 43,560 square feet — about 208.7 feet per side if square, or roughly 90% of an American football field (excluding end zones). It originated as the area plowable in a day and was fixed by statute: 1 furlong × 1 chain = 220 × 22 yards = 4,840 yd² = 43,560 ft².
The acre anchors US land commerce: farms, ranches, timberland, and development parcels are priced per acre, while houses, rents, and construction are priced per square foot. The $ per acre on a listing and the $ per ft² in your head must meet through 43,560 — a $500,000 acre is $11.48/ft² of land, the figure that actually compares with construction costs.
The metric world uses the hectare (10,000 m² = 2.471 acres). International land deals, carbon credits, and agricultural statistics quote hectares; the converter bridges them so a 50-hectare concession reads as 123.6 acres to an American buyer.
Key terms:
43,560 factors as 2² × 3² × 5 × 11² — no deeper meaning, just the arithmetic fossil of furlongs and chains. Memorize 43,560; everything else derives from it.
A listing offers 0.35 acres. How many square feet?
A 2,400 ft² house footprint with setbacks fits comfortably — the lot is about six house-footprints, the suburban norm.
A 640-acre section (one square mile). Express in hectares.
One square mile = 259 hectares exactly (640 ÷ 2.47105). Sections are the grid unit of the US Public Land Survey — the reason Midwest roads run on one-mile grids.
Elena is comparing two lots: Lot A, 0.42 acres at $185,000; Lot B, 21,000 ft² at $178,000. Converting: Lot A = 0.42 × 43,560 = 18,295 ft² at $10.11/ft²; Lot B = 21,000 ft² = 0.482 acres at $8.48/ft². Lot B is bigger and cheaper per foot — the acre-to-square-foot translation exposes what the headline prices hide.
Then the setback check: the county requires 25-foot front, 10-foot side setbacks. On Lot B’s 150 × 140 ft dimensions, the buildable envelope is (150−20) × (140−35) = 13,650 ft² — plenty for her 2,800 ft² plan with yard to spare. Area math graduates from price comparison to feasibility in one more multiplication.
A second scenario: a farmer leases 80 acres at $220/acre/year ($17,600). Per square foot that is $0.005 — half a cent — which reframes the “expensive” lease: the land costs less per foot per year than a gumball. Agricultural economics lives at the acre scale; the converter keeps both scales visible.
The acre’s lineage runs through the Public Land Survey System (PLSS): the 1785 grid that carved the frontier into 6-mile townships, 1-mile sections (640 acres), and quarter-sections (160 acres) — the “quarter section” homesteads of pioneer lore. That grid is why the rural Midwest is a checkerboard and why 160, 80, and 40 acres remain standard parcel sizes two centuries later.
The surveyor’s Gunter’s chain (22 yards, 100 links) made the acre computable in the field: 10 square chains = 1 acre, because a chain is 66 feet and 66 × 660 (a furlong) = 43,560. Every deed’s “metes and bounds” descends from chain-and-compass work, and modern GPS surveys still close against those chain measurements.
Globally, the hectare is winning: the UK metricated land registration, and international bodies (FAO, IPCC) report farmland in hectares. But the acre’s cultural entrenchment — 40 acres and a mule, the 40-acre field, “God’s little acre” — keeps it alive in commerce. Converters like this one are the bilingual dictionary of a long transition.
One delightful fossil: the acre-foot — the water volume covering an acre one foot deep (325,851 gallons). Western US water rights are denominated in acre-feet, merging area and volume into the region’s most litigated unit. An area converter plus a depth is all it takes to enter water law.
Zoning codes translate acres into density arithmetic that decides what gets built. A 10-acre parcel zoned at 4 units per acre yields 40 homes; the same parcel at 0.5-acre minimum lots yields 20. Developers run both directions constantly: acres to lots (division), lots to square feet (multiplication by 43,560), square feet to setbacks (subtraction). The converter sits at the center of that chain, turning policy numbers into buildable reality.
Conservation easements add a financial dialect: donors give up development rights on acreage and claim tax deductions on the appraised per-acre value. An easement on 200 acres at $3,000/acre is a $600,000 deduction — and the IRS scrutinizes the per-acre appraisal fiercely. Whether the number is 199 or 201 acres changes the deduction by thousands, which is why survey-grade acreage (not tax-assessor estimates) anchors these deals.
Timberland investors think in yet another derived unit: cords and board-feet per acre. A well-stocked pine plantation carries 20–30 cords per acre; at $30/cord stumpage, the standing timber is worth $600–900 per acre before the land itself. Converting cruise data (sample plots in square feet) up to per-acre yields, then to dollars, is the daily arithmetic of forest management — acres as the denominator of an entire industry’s profit.
1 acre = 43,560 ft² = 4,840 yd² = 4,046.86 m² = 0.404686 ha; 1 ha = 2.47105 acres; 1 mi² = 640 acres. Convert via ft²: acres×43,560. Origin: 1 furlong × 1 chain. Source: Sigma Calculator, Acres to Square Feet Converter, https://sigmacalculator.net/math-calculators/acres-to-square-feet-converter/
Cite this page as: Acres to Square Feet Converter, Sigma Calculator, https://sigmacalculator.net/math-calculators/acres-to-square-feet-converter/
Last updated: October 12, 2026