Enter dimensions to see area
in acres and other units
What is an Acre? Land Area Calculator
An acre is a unit of land area commonly used in the US and UK. One acre equals 43,560 square feet, 4,840 square yards, or about 4,047 square meters. This calculator converts any length × width (rectangle), circle radius, or triangle base/height into acres and other area units instantly.
Acreage Formulas
How to Use This Acreage Calculator
- 1Select shape — rectangle, circle, or triangle.
- 2Enter dimensions — length/width, radius, or base/height.
- 3Choose input unit — feet, meters, yards, inches, or cm.
- 4Set decimal places — for precision.
- 5Read results — acres, sq ft, sq m, sq yd, hectares.
Worked Example
A rectangular lot is 200 feet long and 150 feet wide. How many acres?
Land Size Reference Table
| Square Feet | Acres | Square Meters | Example |
|---|---|---|---|
| 4,356 | 0.1 | 405 | Small home lot |
| 10,000 | 0.23 | 929 | Quarter-acre (typical suburban) |
| 21,780 | 0.5 | 2,023 | Half acre |
| 43,560 | 1.0 | 4,047 | One acre |
| 87,120 | 2.0 | 8,094 | Two acres |
| 217,800 | 5.0 | 20,234 | Five acres |
| 435,600 | 10.0 | 40,469 | Ten acres |
Common Uses for Acreage Calculator
Calculate lot size for buying/selling land.
Determine field area for crops or grazing.
Site planning and land development.
Estimate materials for lawns, gardens.
Convert measurements to standard units.
Assess taxable land area.
Frequently Asked Questions
Exactly 43,560 square feet. This is a standard defined in the 19th century.
A hectare is metric: 10,000 m² = 2.471 acres. One acre = 0.4047 hectares.
For irregular polygons, break into rectangles/triangles or use a land survey tool. This calculator handles rectangles, circles, and right triangles.
Historical: an acre was the area a yoke of oxen could plow in a day (660 ft × 66 ft).