Conversions & Reference
Acreage Calculator
Calculate the acreage of any land area from length and width measurements. Convert between acres, hectares, square feet, and square meters.
1 Acre
43,560 sq ft
1 Acre
0.4047 hectares
1 Acre
208.7 × 208.7 ft
1 Hectare
2.471 acres
Input
Fill in the fields below, then click Calculate.
Leave blank for circle/triangle
Perpendicular height for triangle
No results yet
Fill in the fields and click Calculate to see results.
Related Calculators
How to Use This Calculator
This land measurement tool simplifies figuring acres for any shape. Select the shape that best matches your land area. For rectangular or square plots, enter the length and width in feet. For circular areas (like pivot irrigated fields), enter the diameter. For triangular parcels, enter the base length and perpendicular height. The calculator instantly converts to acres, hectares, and square feet.
Why This Matters
Accurate acreage measure is the foundation of every farm decision — from seed and fertilizer purchases to crop insurance, cash rent negotiations, and land sales. A 5% error on a 500-acre farm means 25 acres of miscalculated inputs, costing thousands of dollars per year. This calculator gives you precise figures for any land shape.
Methodology
Rectangle area = Length × Width. Circle area = π × (Diameter/2)². Triangle area = (Base × Height) / 2. All results in square feet are divided by 43,560 to convert to acres (the USDA standard). Hectare conversion uses the factor 1 acre = 0.4047 hectares. Square meters = square feet × 0.0929.
Common Mistakes to Avoid
- Measuring along fence lines instead of property boundaries — fences are rarely on exact property lines.
- Forgetting to subtract non-farmable areas (waterways, ditches, tree lines, buildings) from total acreage.
- Confusing gross acres (total land) with net tillable acres (actual farmable area) — typically 5-15% difference.
- Using road frontage × depth for irregularly shaped parcels — this only works for perfect rectangles.
Tips & Best Practices
- One acre is approximately the size of a football field without the end zones (90% of a football field).
- For irregular shapes, divide the area into rectangles and triangles, calculate each separately, and add them together.
- GPS-based measurements from your phone or tractor are more accurate than tape measures for large fields.
- County tax records and USDA FSA maps provide official acreage figures for farm fields.
- When buying land, always verify acreage with a licensed surveyor — fence lines are not legal boundaries.