Acreage Calculator
Enter the length and width of a parcel to calculate acreage instantly — 1 acre = 43,560 square feet. Works in feet, yards, or meters.
Example: with Length 200 · Width 400 · Unit of length Feet → Acreage: 1.84 acres.
Computed by the calculator below using its default values. Change any input to see your own numbers.
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Check it outHow to calculate acreage
To calculate acres, multiply length by width to get square feet, then divide by 43,560. A 200 × 400 ft lot is 80,000 sq ft, or 1.84 acres. The odd-looking constant is the acre’s medieval definition — one chain (66 ft) by one furlong (660 ft) — and it survives in every US deed and listing today.
Useful reference points: a perfectly square acre measures about 208.7 ft per side, a quarter-acre suburban lot is 10,890 sq ft, and a football field between the goal lines (300 × 160 ft) is about 1.1 acres. For an irregular parcel, split it into rectangles and triangles, figure the square feet of each piece (triangle = base × height ÷ 2), add them up, and divide the total by 43,560 once at the end.
How it’s calculated
Acreage = (length × width) in square feet ÷ 43,560, the exact definition of the acre. Yards are converted at 3 ft per yard and meters at 3.280839895 ft per meter (1 m = 100 ÷ 30.48 ft exactly) before squaring. Hectares use 1 sq ft = 0.09290304 m² exactly and 1 ha = 10,000 m².
Results update as you type and are estimates, not professional advice — verify important decisions with a qualified professional.
Common mistakes
- Measuring in yards or meters but still dividing by 43,560 — that constant is square feet only; convert first.
- Quoting square feet as acres: 80,000 sq ft is 1.84 acres, not 8 acres.
- Using length × width on a non-rectangular parcel — split it into simple shapes and sum them instead.
Frequently asked questions
How do I calculate acreage from feet?
Multiply length by width to get square feet, then divide by 43,560. A 150 × 300 ft parcel is 45,000 sq ft = 1.03 acres.
How big is one acre?
43,560 square feet — a square about 208.7 ft on each side, or slightly more than a football field between the goal lines.
How many acres is 200 by 400 feet?
200 × 400 = 80,000 sq ft, and 80,000 ÷ 43,560 = 1.84 acres.
How do I figure acres for an irregular lot?
Break the lot into rectangles and triangles, compute each area in square feet, add them, and divide the total by 43,560. Surveys and GIS parcel maps list the same figure.
How many acres are in a hectare?
One hectare is about 2.471 acres, so a 2 ha field is roughly 4.94 acres.