Acreage Calculator

An acreage calculator turns a lot's length and width into acres and square feet. It multiplies the two sides to get the area, then divides by 43,560, the number of square feet in one acre. For an irregular property, split the lot into rectangles, measure each one, and add the results together.

Last reviewed September 2026Method & sources Report an error

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Acreage

1.3774 acres

Breakdown
Acreage	1.3774 acres
Area	60,000 sq ft

How to Calculate Acreage

Area is Length × Width, and acreage is that area divided by 43,560. That number is the exact count of square feet in one acre. An acre is legally and historically defined as 43,560 sq ft, equivalent to a strip 1 chain by 1 furlong (66 ft × 660 ft). This calculator handles a simple rectangular lot. For an irregular property, break it into rectangular sections, calculate each separately, and add the results together.

Example: 300 ft × 200 ft lot

A 300 ft × 200 ft lot: 1. Area: 300 × 200 = 60,000 sq ft 2. Acres: 60,000 ÷ 43,560 ≈ 1.377 acres For comparison, a standard football field's playing surface (360 ft × 160 ft, including end zones) is about 1.32 acres, which gives you a rough mental reference point for picturing an acre-plus lot.

What Is Acreage?

An acreage calculator converts a property or lot's dimensions into acres, the standard unit for land area in the US. It's commonly used to check a lot's size against zoning minimums, compare properties listed in different units, or figure out how much land a project (like reseeding a lawn or clearing a field) actually covers.

Acreage: What a Pro Checks

Break an irregular lot into rectangular sections and calculate each one separately, then add the results together. This calculator assumes a single rectangle, so a curved or multi-sided lot needs that extra step.
Use a licensed surveyor's figure, not this estimate, for anything legally significant. A sale, a boundary dispute, or a building permit application all depend on a surveyed acreage, not a rough rectangle calculation.

Frequently Asked Questions

How many square feet are in an acre?

Exactly 43,560 sq ft. This figure comes from an acre's historical definition as 1 chain by 1 furlong (66 ft × 660 ft = 43,560 sq ft), and it's still the exact legal definition used today.

How do I convert acres to square feet?

Multiply the number of acres by 43,560. For example, 2.5 acres = 2.5 × 43,560 = 108,900 sq ft.

How big is an acre, in practical terms?

About 208.7 ft × 208.7 ft if perfectly square (208.7² ≈ 43,560), or roughly 75% of a standard American football field including end zones. Most residential lots are a fraction of an acre. A 1/4 acre lot is 10,890 sq ft.

Does this work for an irregularly shaped property?

Not directly. This calculator assumes a simple rectangle. For an irregular lot, break it into rectangular sections (or consult your property's surveyed plat, which states the exact acreage), calculate each section's area separately, and add them together before converting to acres.

Why do property listings sometimes show slightly different acreage for the same lot?

Small differences often come from rounding, from measuring to different boundary references (fence line vs. surveyed property line), or from using tax assessor records versus an actual survey. For anything legally significant (a sale, a boundary dispute, a building permit), rely on a licensed surveyor's figure rather than an estimate.

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