Calculate field area, acres, usable acres, square feet, hectares, perimeter, spray volume, seed needed, fertilizer needed, expected yield, and field value. Use this field area calculator for rectangular fields, circular pivots, triangular fields, known acreage, pastures, hay fields, crop fields, and food plots.
Rectangle fields:
The calculator multiplies field length by width, converts the result to square feet, then divides by 43,560 to estimate acres.
Triangle fields:
Base is multiplied by height and divided by 2 to estimate triangular field area.
Circle or pivot fields:
Radius is squared and multiplied by π to estimate circular field area.
Usable field area:
Usable area and headland percentages adjust the field area for practical farm planning.
A field area calculator helps estimate how many acres are available for planting, spraying, fertilizing, grazing, harvesting, or renting.
It can help compare total acres, usable acres, square feet, hectares, perimeter, seed needed, fertilizer needed, spray volume, expected production, crop value, and field cost.
Your result shows estimated field acres, usable acres, square feet, square yards, square meters, hectares, perimeter, headland acres, spray volume, seed needed, fertilizer needed, expected production, field cost, and expected crop value. These are estimates based on the values you enter.
Calculate the field area in square feet, then divide by 43,560 to convert square feet to acres.
Multiply length by width. If measurements are in feet, divide the square feet result by 43,560 to get acres.
For a circular pivot, multiply π by the radius squared. If radius is in feet, divide the square feet result by 43,560 to estimate acres.
Usable acres are the acres available after subtracting or adjusting for headlands, buffers, waterways, roads, ditches, tree lines, wet areas, and other nonproductive field areas.