✦ Measurements

Land Plot Area Calculator

Measure plot area, inspect boundaries and export your calculation.

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Choose a plot shape

Don't know the length and width?

Check your deed or survey plan first. If you have an area in perches/acres, convert it directly; otherwise measure the distances needed for your shape. No reliable area can be calculated without enough measurements.

How to get usable measurements

For a rectangular plot, measure the two perpendicular sides with a tape or measuring wheel; enter both in the same unit.
For a triangle or trapezoid, measure the perpendicular height between the base / parallel sides—not a sloping fence length.
For an irregular plot, ask for its surveyed x,y corner coordinates, or measure each corner's perpendicular X and Y offsets from a common origin. Use the polygon mode and enter the corners in boundary order.

Four fence lengths by themselves, a photo, or unverified phone GPS points do not determine a dependable legal land area. For purchases, disputes or deeds, use a licensed surveyor.

Already know perches/acres? Convert units instead →

Enter your measurements

Measurement unit

Changing units clears measurements. Re-enter values in the new unit.

Length *

Width *

Units and calculation rules

Positive lengths up to 100,000; up to 4 decimal places. Coordinates may be negative. Results use the international foot (0.3048 m), 40 perches per rood and 160 perches per acre.

Land area: common questions

How do I calculate land area in perches?

Choose the plot shape, select feet or metres, and enter the measured dimensions. For a rectangle, length × width gives square units; the calculator converts the area to perches (1 perch = 272.25 square feet), acres and A–R–P.

Can I find irregular land area from just four side lengths?

No. Different quadrilaterals can share four side lengths but have different areas. You need more information, such as surveyed corner coordinates or sufficient measured diagonals and angles. The polygon mode uses ordered planar x,y coordinates.

Can I calculate without measuring length and width?

If the area is already on a deed or survey plan, use the land unit converter. If only the plot outline or an estimate is known, get reliable measurements first. The result here is not a cadastral survey, legal certificate or GPS measurement.

Use measured perpendicular heights, not sloping sides. Four side lengths alone cannot determine an arbitrary plot. Polygon coordinates must use the selected unit and a common planar origin. Results are estimates from your measurements, not a cadastral survey or legal deed.