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Agriculture Field Area Calculator

Calculate field area in acres and hectares from dimensions or GPS coordinates. Estimate planted acreage for farm planning, inputs, and yield reporting.

Use this result well

Inputs that matter
Field Length, Field Width, Unit
Output to expect
Field Area Calculator
  • Check the units and required inputs before comparing results.
  • Keep the assumptions with a copied result so you can reproduce the calculation later.
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Reference & details

How it works

Rectangle Area

One acre = 43,560 square feet. Measure longest straight dimensions or use average width on irregular fields.

Acres = (Length ft × Width ft) ÷ 43,560

Hectare Conversion

International standard for yield reporting (t/ha) and EU farm programs.

Hectares = Acres × 0.4047

Irregular Fields

Trapezoid and triangle sections sum for odd-shaped parcels. GPS boundary walk most accurate.

Divide into triangles/rectangles; sum areas; or use coordinate polygon method

Updated: July 2026

Example Scenarios

Half-mile by quarter-mile = 80 acres. Standard quarter-quarter section reference for US farmland.

Split into 40 ac + 15 ac sections = 55 ac total grazeable area excluding wooded corner.

Exclude headlands and road from gross parcel area for accurate per-acre input rates.

FAQ

43,560 square feet exactly. 208.71 ft × 208.71 ft square approximates one acre.

Gross includes headlands and turn rows. Net planted excludes non-cropped areas — use net for seed/fertilizer rate per planted acre.

RTK GPS and drone orthomosaic boundaries within 1% of true area. Manual tape measure adequate for small rectangular plots.

Acres = Hectares × 2.471. 100 hectares = 247.1 acres.

Report planted acres to FSA for program eligibility. Match calculator area to crop insurance planted acre documentation.

About Agriculture Field Area Calculator

Measure field and plot areas for seed, fertilizer, and chemical application planning. Enter length and width for rectangular fields, or sum multiple shapes, to get area in acres, hectares, and square feet.