How many acres is my property?

Three practical ways to find your property acreage

1. Check the recorded acreage

If you need the acreage used in a sale, tax record, title document or other official context, begin with the recorded source available in your area. Depending on the location, that may be a deed, recorded survey, assessor record, parcel map or local GIS record.

This number is different from a quick map estimate. A map trace can help you plan, but it does not replace the legal or recorded description of the parcel.

2. Convert known square footage to acres

If you already know the lot contains a certain number of square feet, the conversion is direct:

Acres = square feet ÷ 43,560

For example, a 21,780 sq ft lot is 0.5 acre. A 10,890 sq ft lot is 0.25 acre. Use the Square Feet to Acres Calculator when you already have the square-foot figure.

3. Trace the lot on a map

If the parcel is irregular or you do not know its dimensions, a map trace is often the fastest way to get a planning estimate. Search for the property, zoom in, draw the visible or known boundary, and let the map calculate the enclosed area.

The Acreage Calculator & Lot Size Map reports acres, square feet, square metres and perimeter from the polygon you draw.

Recorded acreage vs measured acreage

It is normal for different sources to produce slightly different numbers. A recorded acreage may come from a survey or legal description. A county GIS polygon is a mapped representation of parcel information. A boundary you trace yourself depends on the imagery, map alignment and where you place each corner.

Use the number that matches your decision. For legal, ownership or transaction questions, rely on the appropriate recorded documents and qualified professionals. For estimating fencing, landscaping, lawn, gravel or whether a project deserves further investigation, a careful map measurement can be useful.

How to measure an irregular property

Do not force an angled or many-sided lot into one length × width calculation. A rectangle formula works only when the shape is reasonably rectangular. For an irregular parcel, either:

• trace the actual boundary on a map;
• use a survey or plat image with known dimensions; or
• break the measured shape into simpler sections and calculate each part.

If you have a survey or plat image, the Survey / Plat Image Tool lets you calibrate the image with a known dimension and trace the property shape.

What if the map acreage is different from the deed?

First, check that you traced the same parcel and did not follow a fence, hedge, road edge or mowing line that differs from the actual property boundary. Then compare the trace with the best parcel or survey information available.

A discrepancy does not automatically mean either source is wrong. Imagery can be offset, visible features can be misleading, old records can use different methods, and hand-drawn points introduce measurement error. If the difference matters for ownership, construction, a boundary fence, a sale or a dispute, use an authoritative survey or local professional rather than trying to resolve it from imagery alone.

Common acreage examples

For more examples and acre dimensions, see How Many Square Feet Are in an Acre? and the Acre Dimensions Calculator.

Frequently asked questions