Landscape & Groundwork

Acreage Calculator

Convert plot dimensions or a known area into acres, hectares, square feet and metres.

Units

Your measurements

Results update as you type.

Example shown — use your own measurements.

Extra options & cost (optional)
Fractions and number formats

Use decimals (12.5), fractions (12 1/2 or 12-1/2), or explicit lengths (12ft 6in, 12′ 6″, 25 mm). A comma followed by one or two digits is a decimal comma: 12,5 = 12.5. Grouped commas mean thousands: 1,200 = 1200. Use a decimal point for ambiguous values. Scientific notation is not accepted.

Enter your measurements

Results update as you type.

About this calculator

Enter a rectangle, triangle or circle — or a known area — and get the land area in square feet, square metres, acres and hectares. Irregular plots can be estimated by splitting them into shapes and adding the results.

1. Length2. Width
Measurement guide, not to scale. Follow the field labels for the selected mode.

How to use this calculator

  1. Choose the shape that best matches the plot.
  2. Measure and enter the dimensions in any supported unit.
  3. Subtract any area that should not count (optional).
  4. Read the area in ft², m², acres and hectares.

Formula

Rectangle = L × W; triangle = base × height ÷ 2; circle = π × d² ÷ 4

Acres = square feet ÷ 43,560 (exact)

Hectares = square metres ÷ 10,000 (exact)

Assumptions

  • Uses the international foot (0.3048 m exactly) and the statute acre of 43,560 ft² — not legacy survey feet.
  • Shapes are planar; slopes are not adjusted.
  • Irregular plots should be partitioned into simple shapes and summed manually.

Common mistakes

  • Treating an irregular boundary as a single rectangle.
  • Mixing the international foot with a historical survey-foot basis.
  • Using a planning area as a substitute for a legal survey.

Worked example

Try it: press “Load example” above the form.

43,560 ft² is exactly 1 acre = 4,046.8564224 m².

Limitations

No boundary, cadastral, GIS or survey certification, and no map/GPS integration in this release.

Frequently asked questions

Which acre does this tool use?

It uses the international acre: 43,560 international square feet. Historical US survey-foot definitions can differ, so use the surveyor’s stated units for legal land records.

Can a rectangular estimate replace a boundary survey?

No. A length-times-width area assumes a rectangle. Curved boundaries, easements and legal parcel areas need suitable plans or a survey.

What does the worked example show?

43,560 ft² is exactly 1 acre = 4,046.8564224 m².

Which assumptions should I check before using the result?

No boundary, cadastral, GIS or survey certification, and no map/GPS integration in this release.

Reviewed by Codex AI editorial agent (Editorial, 2026-11-12).

Sources

Sources explain the methods and any named product presets. Check your product label where coverage, yield or density differs.

Calculation documentation · Updated 2026-11-08 · Version 1.6.4. Estimates are planning aids. Confirm quantities, coverage and prices with your supplier before purchasing. Found an error? Report it.

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