Land records · Acreage · October 2, 2026
How to Find the Acreage of a Property: Records vs Map Measurements
How to find acreage of property: check the assessor record, the deed and plat, and GIS measure tools, then understand why those numbers disagree and which one to trust.
Knowing how to find the acreage of a property matters for buying land, splitting a lot, setting up a farm program, or just checking a listing. You can usually find three or four different numbers: the assessor’s, the deed’s, the plat’s, and whatever you measure on a map. They rarely agree to the decimal. Here is where each comes from and which one to rely on.
1. The assessor or parcel record
Search the county parcel viewer or assessor site by address, owner, or parcel number. The record card usually lists land area in acres or square feet. Find the county in our GIS directory. Assessor acreage is used for taxation. It is often copied from older records or calculated from the GIS shape, so it is a good starting point but not proof.
2. The deed and the recorded plat
Deeds often state acreage, sometimes followed by “more or less.” See what “more or less” means in a deed. Subdivision plats usually list each lot’s area in square feet or acres, and survey plats show it in the drawing or a table. When the deed describes the land by metes and bounds, the bearings and distances define the shape, and the stated acreage is secondary. How to read a plat map shows where to find lot areas.
3. Measuring in a GIS viewer or map app
Most county viewers have a measure tool. Trace the parcel outline and read the area. Online map apps do the same over aerial photos. This is handy for a quick estimate or for measuring part of a property, like a pasture. Remember that the parcel lines in GIS are drawn to fit the map and can be shifted by several feet. Google Maps property lines and aerial photo vs lot lines explain the limits.
Quick conversion math
- 1 acre = 43,560 square feet.
- Acres = square feet ÷ 43,560.
- A 100 ft × 200 ft lot = 20,000 sq ft ≈ 0.46 acre.
- A quarter-quarter section in the public land survey system is nominally 40 acres. Actual sections vary. See what is a quarter section.
Why the numbers disagree
- GIS shapes are approximate and get adjusted over time. See why GIS lot lines move.
- Older deeds used chains, rods, or rounded figures.
- Road rights of way may be included in one figure and left out of another.
- Splits, merges, or boundary adjustments may not have reached every record yet.
Which acreage to trust
For a quick check, the assessor number is fine. For a purchase, a lot split, or anything priced by the acre, rely on a current boundary survey by a licensed surveyor. Ask the surveyor to state the acreage with and without any road right of way. If you are buying an acreage parcel, what is an acreage tract covers more questions to ask.
Find property acreage FAQ
Where can I find the acreage of my property online?
Start with the county assessor or parcel viewer, which usually lists land area in acres or square feet. Recorded plats and deeds often state acreage too.
Why does the GIS acreage differ from my deed?
GIS parcel shapes are drawn for mapping and can be shifted or simplified. Deeds may use older measurements or ‘more or less’ language. A current survey gives the most reliable figure.
How do I convert square feet to acres?
Divide square feet by 43,560. For example, 21,780 square feet is half an acre.
Can I measure acreage on Google Maps?
You can trace a rough outline with map measuring tools, but aerial imagery does not show legal lines. Treat it as an estimate only.
This guide is general information, not legal advice or a survey. Confirm details with the county office, a licensed surveyor, or an attorney before you act.