Free tool · for land buyers, homeowners, farmers and agents
Acreage Calculator: Convert Square Feet to Acres for Any Lot
Enter your lot’s length and width, or an area you already know, and get the acreage instantly, with square feet, hectares, the price per acre and several parcels added together.
Acreage Calculator
- Your lot0.4591 acres · 20,000 sq ft
1 acre = 43,560 square feet (an area of 208.7 × 208.7 ft). For a sale, a deed or a boundary dispute, use the acreage on your survey or county parcel record; field measurements and irregular boundaries can differ.
How Many Square Feet Are in an Acre?
One acre is 43,560 square feet. To find acreage, multiply the lot’s length by its width in feet and divide by 43,560: a 100 by 200-foot lot is 20,000 square feet, or 0.46 acres. One acre is also about 4,047 square meters, or 0.4047 hectares.
Checked against the sources below · How we build and test our calculators
Square Feet to Acres Chart
Square feet divided by 43,560, rounded to four decimals.
| Square feet | Acres | Hectares |
|---|---|---|
| 5,000 sq ft | 0.1148 | 0.0465 |
| 7,500 sq ft | 0.1722 | 0.0697 |
| 10,000 sq ft | 0.2296 | 0.0929 |
| 10,890 sq ft | 0.25 | 0.1012 |
| 15,000 sq ft | 0.3444 | 0.1394 |
| 20,000 sq ft | 0.4591 | 0.1858 |
| 21,780 sq ft | 0.5 | 0.2023 |
| 32,670 sq ft | 0.75 | 0.3035 |
| 43,560 sq ft | 1 | 0.4047 |
| 87,120 sq ft | 2 | 0.8094 |
| 100,000 sq ft | 2.2957 | 0.929 |
| 217,800 sq ft | 5 | 2.0234 |
| 435,600 sq ft | 10 | 4.0469 |
Common Lot Sizes in Acres
| 50 × 100 ft | 5,000 sq ft | 0.115 acres |
|---|---|---|
| 60 × 120 ft | 7,200 sq ft | 0.165 acres |
| 75 × 150 ft | 11,250 sq ft | 0.258 acres |
| 100 × 100 ft | 10,000 sq ft | 0.23 acres |
| 100 × 200 ft | 20,000 sq ft | 0.459 acres |
| 150 × 300 ft | 45,000 sq ft | 1.033 acres |
| 208.7 × 208.7 ft | 43,560 sq ft | 1 acre |
| 330 × 660 ft | 217,800 sq ft | 5 acres |
How to Calculate Acreage
- Rectangle: length × width (feet) ÷ 43,560.
- Triangle: base × height ÷ 2 ÷ 43,560.
- Trapezoid: (side A + side B) ÷ 2 × distance between them ÷ 43,560.
- Circle: 3.1416 × radius² ÷ 43,560.
- Irregular lot: split it into these shapes and add them up.
- Meters: square meters ÷ 4,046.86 = acres.
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Questions
How many square feet are in an acre?
One acre is 43,560 square feet. That is 4,840 square yards, about 4,047 square meters, or 0.4047 hectares. A square acre measures about 208.7 feet on each side.
How do I calculate the acreage of a lot?
Multiply the length by the width in feet to get square feet, then divide by 43,560. A 100 by 200-foot lot is 20,000 square feet, which is 0.46 acres.
How do I convert square feet to acres?
Divide the square feet by 43,560. For example, 10,000 sq ft ÷ 43,560 = 0.23 acres, and 87,120 sq ft = exactly 2 acres.
How big is an acre?
About 208.7 by 208.7 feet, or roughly 90% of an American football field measured from goal line to goal line (300 by 160 feet). A half acre is 21,780 square feet and a quarter acre is 10,890.
How do I find the acreage of an irregular lot?
Split the lot into rectangles, triangles and trapezoids, add each one as a parcel in the calculator, and it totals them. For a sale or deed, use the acreage on your survey or county parcel record.
How many acres are in a square mile?
640 acres. A square mile is 27,878,400 square feet, and 27,878,400 ÷ 43,560 = 640.
How many acres is a hectare?
One hectare (10,000 square meters) is about 2.471 acres, and one acre is about 0.4047 hectares.
How do I work out the price per acre?
Divide the total price by the number of acres. A 2.5-acre lot listed at $45,000 is $18,000 per acre. Enter either the total or the price per acre in the calculator and it shows the other, plus the price per square foot.