Acre Calculator – Acres, Square Feet, Meters and Hectares
Use this free acre calculator to convert land area between US and metric units. This acreage calculator also works in reverse: enter square feet, square meters, hectares, or square yards. No sign-up is needed.
Acre Converter
- Acres
- Square Feet
- Square Meters
- Hectares
- Square Yards
- Square Miles
Calculations use square feet without intermediate rounding. Displayed decimals: acres 4, square meters 2, hectares 6, square miles 7; square feet and yards round to whole numbers. Positive results below 1 keep at least 4 significant digits.
How Many Square Feet in an Acre?
1 acre = 43,560 square feet. Multiply a land area in acres by 43,560 to get square feet. For a fraction, divide that total by the denominator: a quarter is 43,560 ÷ 4 = 10,890 square feet.
| Land size | Square Feet |
|---|---|
| 1 acre | 43,560 |
| 1/2 acre | 21,780 |
| 1/4 acre | 10,890 |
| 1/8 acre | 5,445 |
| 2 acres | 87,120 |
| 5 acres | 217,800 |
The seemingly awkward number comes from an older rectangle of 1 furlong × 1 chain, or 660 ft × 66 ft: 43,560 carries those inherited measuring units rather than a tidy decimal grouping.
These conversions use the international foot, defined as 0.3048 meters. NIST lists the underlying length and area factors.
How Big Is an Acre?
Area tells you how much ground a boundary encloses, not what shape it has. These comparisons help you picture 43,560 square feet:
- A full American football field, including end zones, is 360 ft × 160 ft = 57,600 sq ft. One acre covers about 76% of that area; the field is about 32% larger.
- A singles tennis court measures 78 ft × 27 ft = 2,106 sq ft. About 20.7 of those playing areas fit into the same total, excluding space around the courts.
- Using a soccer field of roughly 76,000 sq ft as a reference, the comparison is about 0.57 of a field. Soccer field sizes vary, so this is an illustration rather than a fixed unit.
- A square with sides of about 208.7 ft encloses approximately the same area.
- A long strip measuring 60 ft × 726 ft also equals 1 acre, despite looking very different from a square.
The smaller square has half the area, so its side is about 71% as long. Halving both side lengths would leave only a quarter of the area.
Playing-area dimensions: NFL field rules and ITF court dimensions.
Acres to Square Feet
Use this table to compare common parcel sizes. Square feet are exact for these whole-number inputs; square meters are rounded to two decimal places.
| Acres | Square Feet | Square Meters |
|---|---|---|
| 1 | 43,560 | 4,046.86 |
| 2 | 87,120 | 8,093.71 |
| 3 | 130,680 | 12,140.57 |
| 5 | 217,800 | 20,234.28 |
| 10 | 435,600 | 40,468.56 |
| 20 | 871,200 | 80,937.13 |
| 40 | 1,742,400 | 161,874.26 |
| 40 acres is a familiar size in US homesteading history: a quarter-quarter section has a nominal area of 40 acres in the Public Land Survey System. BLM describes these subdivisions. | ||
| 100 | 4,356,000 | 404,685.64 |
1 square mile = 640 acres, so 1 acre = 0.0015625 square miles. Keep extra decimal places when recording small fractions of a square mile.
Other Common Acre Conversions
- Acres to hectares: 1 acre ≈ 0.404686 ha.
- Hectares to acres: 1 ha ≈ 2.47105 acres.
- Acres to square meters: 1 acre ≈ 4,046.86 sq m.
- Square meters to acres: divide by 4,046.8564224; 10,000 sq m ≈ 2.47105 acres.
- Acres to square yards: 1 acre = 4,840 sq yd.
- Square feet to acres: divide by 43,560; 43,560 sq ft = 1 acre.
Metric equivalents shown with ≈ are rounded for reading. The converter uses 1 square meter ≈ 10.7639104 square feet without intermediate rounding, with 1 hectare = 10,000 square meters and 1 square yard = 9 square feet.
Measuring Land in Acres
For a rectangular plot, measure the length and width in the same unit, then multiply them. Enter that measured area above and select square feet, square meters, or square yards to see its equivalent in acres.
If the plot has four unequal sides, use our area calculator with the four side lengths and one diagonal. It divides a simple quadrilateral along an interior diagonal into two triangles, calculates their areas, and adds them. Convert that result here; four side lengths alone do not determine the enclosed area.
Frequently Asked Questions
How many square feet are in an acre?
There are exactly 43,560 square feet in an acre. Multiply a measurement in acres by 43,560 to express the same area in square feet, regardless of the shape of the land.
How many acres is 1 hectare?
1 hectare is approximately 2.471 acres, or 2.47105 when rounded to five decimal places. A hectare is exactly 10,000 square meters, making it larger than the other unit.
How do I convert square feet to acres?
Divide the area in square feet by 43,560. For example, 21,780 ÷ 43,560 = 0.5, so that plot covers half an acre.
What is an acre in meters?
An acre is approximately 4,046.86 square meters. This is an area measurement, not a length in meters; its boundaries can form many different shapes.
How big is half an acre?
Half an acre is 21,780 square feet, or approximately 2,023.43 square meters. A rectangle measuring 60 ft × 363 ft has exactly that area.
Is an acre bigger than a hectare?
No, a hectare is larger: 1 hectare equals approximately 2.471 acres. Conversely, 1 acre is approximately 0.404686 hectares, a little over two-fifths of a hectare.
For a single room or surface, use the square foot calculator to find its area or a missing dimension.