Acreage Calculator

Calculate rectangular land area in acres, hectares, square feet, and square metres from lot dimensions for property and land planning.

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Land measurement tool Estimate acreage, hectares, and square-area conversions from measured length and width before you compare parcel sizes or project land use.

Length (ft) Width (ft) Unit

Enter values Provide positive length and width measurements to calculate the land area.

Also in Area

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Land Measurement

Land area in acres, hectares, square feet, and square metres

An acreage calculator converts land dimensions into acres, hectares, square feet, and square metres for property assessment, land purchase, and agricultural planning. It is a practical acreage calculator for rectangular parcels and simple subdivisions when you want a fast area estimate from field measurements, lot dimensions, or deed descriptions.

About this calculator

Reviewed March 2026

Methodology

Calculates area from length and width, then converts the total into acres, hectares, square feet, and square metres using NIST conversion factors for area units.

Limitations

Assumes the entered dimensions represent the parcel geometry you want to measure; irregular parcels should be split into sections and totaled
Does not replace a formal boundary survey, deed description, or legal land record
Does not account for slope, access strips, easements, or other unusable sections of land
Comparisons for buying, selling, or agricultural planning should be checked against the recorded parcel figure before use

Disclaimer

This is a planning estimate only. For legal, tax, or transaction purposes, verify acreage against the recorded survey or deed and seek professional advice where needed.

Sources

NIST Unit Conversion — Authoritative NIST conversion tables showing acre, hectare, square foot, and square metre relationships.
NIST SI Units - Area — NIST explanation of square-area units and the metric relationship for hectares.

See our calculation methodology and editorial standards for how this estimate is produced.

How acreage is calculated

For rectangular lots the calculation is straightforward: multiply length by width to get the total area in square feet or square metres, then convert into acres or hectares. One acre equals 43,560 square feet exactly, and one hectare equals 10,000 square metres exactly according to NIST conversion tables.

Irregular parcels can be broken into simpler shapes, each calculated separately and then summed. The calculator handles the unit conversions so you can work in feet, yards, or metres and still get a reliable acreage figure for planning, listing comparisons, or agricultural estimates.

Common acreage references

An acre is roughly the size of a football field without end zones. Understanding common lot sizes helps when comparing property listings, zoning requirements, or agricultural yield estimates. The calculator shows multiple unit formats so the result is useful regardless of whether your context is imperial or metric.

For agricultural planning, acreage determines seed rates, fertiliser quantities, and irrigation coverage. For property transactions, accurate acreage is essential for valuation, tax assessment, and legal descriptions.

Worked acreage example

A 660 ft by 66 ft parcel covers 43,560 square feet, which is exactly 1 acre. The same parcel is 4,840 square yards, 4,046.8564224 square metres, and about 0.40468564224 hectares.

That makes the calculator useful when you need to move between imperial and metric references without redoing the geometry by hand. It also helps if a listing, survey note, or agricultural reference uses a different unit from the one you are working in.

What this result does not cover

This calculator does not replace a formal boundary survey or legal description. If a parcel is irregular, curved, or split by easements, you should verify the final figure against the recorded survey or deed rather than relying on a simple length-by-width estimate.

It also does not account for unusable land, access strips, slope, or local zoning setbacks. Those factors matter for building, farming, and land purchase decisions even when the acreage math itself is correct.

Frequently asked questions

How many square feet are in an acre?

One acre equals 43,560 square feet exactly. This is the standard conversion used in US property measurement, land surveying, and real estate.

How do I convert square metres to acres?

Divide the area in square metres by 4,046.8564224 to get acres. Alternatively, convert to hectares first by dividing by 10,000 and then multiply by 2.471 for a close planning estimate.

What is the difference between an acre and a hectare?

An acre is an imperial unit equal to 43,560 square feet. A hectare is a metric unit equal to 10,000 square metres. One hectare is approximately 2.471 acres.

Should I use acres or hectares when comparing land?

Use acres when you are working with US property listings, rural land records, or agricultural references written in imperial units. Use hectares when you need a metric figure for planning, international comparisons, or metric-based reporting.

Acreage Calculator

Land area in acres, hectares, square feet, and square metres

How acreage is calculated

Common acreage references

Worked acreage example

What this result does not cover

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