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.
Built for Agriculture1 documented formulaFocused single-task workflowPrivate in your browser
Use this result well
A quick decision brief for this specific tool
Inputs that matter
Field Length, Field Width, Unit
Output to expect
Field Area Calculator
How it works
1 documented formula across 1 calculation mode
- Keep 2 bounded inputs within the limits shown beside the fields.
- Confirm that every value uses the unit and time basis shown before comparing scenarios.
- Change one input at a time to see which assumption materially changes the result.
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Reference & details
How it works
Updated July 2026
How it works
Updated July 2026Rectangle Area
One acre = 43,560 square feet. Measure longest straight dimensions or use average width on irregular fields.
Acres = (Length ft × Width ft) ÷ 43,560Hectare Conversion
International standard for yield reporting (t/ha) and EU farm programs.
Hectares = Acres × 0.4047Irregular 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 methodUpdated: 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.