Acreage Calculator

Calculate land acreage from dimensions in feet, meters, or yards. Supports rectangular, triangular, and circular shapes with step-by-step calculations, visual diagrams, and comprehensive unit conversions.

Free to useNo sign-up requiredUpdated Jan 2026

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About Acreage Calculator

Welcome to the Acreage Calculator, a comprehensive land area tool that calculates acreage from your property dimensions. Whether you have a rectangular lot, a triangular parcel, or a circular plot, this calculator provides instant conversions to acres, hectares, square feet, and many other units with step-by-step calculations and visual diagrams.

What is an Acre?

An acre is a unit of land area used in the imperial and U.S. customary measurement systems. It is the most common unit for measuring land in the United States, United Kingdom, and several other countries. The word "acre" comes from Old English meaning "open field."

Key Acre Facts

1 acre = 43,560 square feet (the most important conversion)
1 acre = 4,840 square yards
1 acre = 160 perches (square rods)
1 acre = 10 square chains
1 acre = 4 roods
1 acre = 0.404686 hectares
1 acre = 1/640 square mile (640 acres = 1 square mile)

Standard Acre Dimensions

A traditional acre is defined as a chain by a furlong:

Standard Acre

$$1 \text{ acre} = 66 \text{ ft} \times 660 \text{ ft} = 1 \text{ chain} \times 1 \text{ furlong}$$

A perfect square acre would measure approximately 208.71 feet on each side (since the square root of 43,560 is about 208.71).

How to Calculate Acreage

Rectangular or Square Plots

For rectangular land, multiply length by width to get square feet, then divide by 43,560:

Rectangle Formula

$$\text{Acres} = \frac{\text{Length (ft)} \times \text{Width (ft)}}{43,560}$$

Triangular Plots

For triangular parcels, use half the base times height:

Triangle Formula

$$\text{Acres} = \frac{\frac{1}{2} \times \text{Base (ft)} \times \text{Height (ft)}}{43,560}$$

Circular Plots

For circular land areas, use pi times radius squared:

Circle Formula

$$\text{Acres} = \frac{\pi \times \text{Radius (ft)}^2}{43,560}$$

Common Lot Sizes in Acres

Lot Size	Square Feet	Acres	Typical Use
Small city lot	5,000 sq ft	0.115 acres	Urban residential
Standard city lot	7,500 sq ft	0.172 acres	Urban residential
1/4 acre	10,890 sq ft	0.25 acres	Suburban home
1/3 acre	14,520 sq ft	0.33 acres	Suburban home
1/2 acre	21,780 sq ft	0.5 acres	Large suburban lot
Full acre	43,560 sq ft	1.0 acre	Estate/rural home
Football field	~57,600 sq ft	1.32 acres	(including end zones)

Acres vs Hectares

While acres are standard in the US and UK, most of the world uses hectares (metric system):

1 hectare = 2.47105 acres
1 acre = 0.404686 hectares
1 hectare = 10,000 square meters
1 hectare = 100 meters × 100 meters

Historical Land Units

Our calculator also provides conversions to historical land measurement units:

Perches (Square Rods): 1 acre = 160 perches. A perch equals 16.5 ft × 16.5 ft (272.25 sq ft).
Square Chains: 1 acre = 10 square chains. A chain is 66 feet (4 rods), and a square chain is 4,356 sq ft.
Roods: 1 acre = 4 roods. A rood is a quarter of an acre (10,890 sq ft).

Tips for Measuring Land

Use accurate measurements: Measure length and width at ground level, or use property survey documents.
Account for irregular shapes: Divide complex plots into simple shapes, calculate each separately, and add them together.
GPS tools: For large or irregular properties, consider using GPS mapping tools or professional surveys.
Check official records: Property deeds and tax records often list official acreage.

Frequently Asked Questions

How many acres is my lot?

To calculate acres, multiply the length by width (for rectangular lots) to get square feet, then divide by 43,560. For example, a 200 ft × 200 ft lot is 40,000 sq ft ÷ 43,560 = 0.918 acres. Our calculator handles rectangular, triangular, and circular plots with various input units.

What is an acre?

An acre is a unit of land area equal to 43,560 square feet, 4,840 square yards, or approximately 0.4047 hectares. Originally defined as the area that could be plowed in one day with a yoke of oxen, one acre equals 1/640 of a square mile. A standard acre is 66 feet × 660 feet (one chain by one furlong).

How many square feet in an acre?

One acre equals exactly 43,560 square feet. This is equivalent to 4,840 square yards, 160 perches (square rods), 10 square chains, 4 roods, or approximately 4,047 square meters (0.4047 hectares). A perfect square acre would measure about 208.71 feet on each side.

How do I convert acres to hectares?

To convert acres to hectares, multiply the acreage by 0.404686. For example, 5 acres × 0.404686 = 2.023 hectares. Conversely, to convert hectares to acres, multiply by 2.47105. One hectare equals 10,000 square meters or approximately 2.47 acres.

What are common lot sizes in acres?

Common residential lot sizes include: 1/4 acre (10,890 sq ft, typical suburban lot), 1/3 acre (14,520 sq ft), 1/2 acre (21,780 sq ft), and 1 acre (43,560 sq ft). A standard city lot is often around 5,000-7,000 sq ft (0.11-0.16 acres), while rural properties typically range from 1-10+ acres.

How do I calculate acreage for irregular shaped land?

For irregular plots, divide the land into multiple regular shapes (rectangles, triangles), calculate each section's area separately, then add them together. Our calculator supports rectangles, triangles, and circles. For complex shapes, consider using a land surveyor or GPS mapping tools.

Additional Resources

Reference this content, page, or tool as:

"Acreage Calculator" at https://MiniWebtool.com/acreage-calculator/ from MiniWebtool, https://MiniWebtool.com/

by miniwebtool team. Updated: Jan 29, 2026

Developer API available: Run this tool from your app, automation, or agent with one JSON HTTP request. View API docs