Acreage Dimensions and Perimeter Calculator
Calculate field acres and perimeter in feet from length and width, for fencing, lime and material planning on rectangular plots.
How This Calculation Works
Acres equals length times width divided by 43,560 square feet per acre. Perimeter equals two times the sum of length and width. A 660 by 330 foot field is 5 acres with a perimeter of 1,980 feet.
Field Calibration & Rate Reference Chart
| Area | Square feet | Acres | Square field side |
|---|---|---|---|
| 1,000 sq ft | 1,000 | 0.023 | 32 ft |
| 5,000 sq ft | 5,000 | 0.115 | 71 ft |
| 10,000 sq ft | 10,000 | 0.230 | 100 ft |
| 0.25 acre | 10,890 | 0.250 | 104 ft |
| 0.5 acre | 21,780 | 0.500 | 148 ft |
| 1 acre | 43,560 | 1.000 | 209 ft |
| 5 acres | 217,800 | 5.000 | 467 ft |
| 10 acres | 435,600 | 10.000 | 660 ft |
| 40 acres | 1,742,400 | 40.000 | 1,320 ft |
| 100 acres | 4,356,000 | 100.000 | 2,087 ft |
Common Questions
How do I calculate acres from length and width?
Multiply length by width in feet, then divide by 43,560. A 660 by 330 foot field is 217,800 square feet, or 5 acres. For irregular fields, break the shape into simpler figures.
How do I calculate the perimeter of a field?
For a rectangle, add the length and width and multiply by two. A 660 by 330 foot field has a perimeter of 1,980 feet. Irregular fields need each side measured and summed.
How many feet are in an acre?
An acre is 43,560 square feet, which is about 208.7 feet on a side if square. A square acre has a perimeter of about 835 feet. The shape changes the perimeter for the same area.
Why does perimeter matter for a field?
Perimeter drives fencing material, headland turns and border effects. A long, narrow field has more perimeter per acre than a square one. Accurate perimeter prevents under-ordering fence materials.