How many square feet are in an acre?

One acre equals exactly 43,560 square feet. This standardized measurement equals a square roughly 209 feet on each side, or about 90% of a football field.

How do I convert acres to hectares?

Multiply acres by 0.404686 to get hectares. For reverse conversion, multiply hectares by 2.47105 to get acres.

What is the difference between acres and square miles?

One square mile equals 640 acres. Acres are used for smaller properties like residential lots and farms, while square miles measure larger areas like cities and counties.

How much land do I need for a house?

A typical suburban single-family home requires 0.15-0.5 acres. Urban lots are smaller (0.1-0.25 acres), while rural properties often start at 1+ acres for more privacy and space.

What can I do with 1 acre of land?

One acre (43,560 sq ft) can accommodate a large home with extensive landscaping, a small farm with vegetables and livestock, recreational facilities like tennis courts, or commercial uses like storage units or event venues.

Is an acre the same as a hectare?

No, they differ in size and origin. One acre equals 0.405 hectares, while one hectare equals 2.47 acres. Hectares are used internationally (metric system), while acres are primarily used in the United States.

Conversion Calculators

Acre Calculator

Convert between acres and other area units including square feet, square meters, hectares, and more. Perfect for land measurement, property planning, real estate calculations, and agricultural field sizing with instant conversions.

How to Use the Acre Calculator

Use the Acre Calculator to between acres and other area units including square feet, square meters, hectares, and more. Perfect for land measurement, property planning, real estate calculations, and agricultural field sizing with instant conversions.. Enter your values to get accurate, instant results tailored to your situation.

Free unit conversion calculators for length, weight, temperature, volume, and more. Convert between metric and imperial units instantly.

Common Uses

Calculate acre accurately and instantly
Calculate land area accurately and instantly
Calculate property measurement accurately and instantly
Calculate acreage accurately and instantly
Calculate area converter accurately and instantly

Related Calculators

More Conversion Calculators

Browse all 311+ free online calculators

Complete Acre Conversion Guide

Land measurement essentials

Expert Tips

Quick Acre Formula: 1 acre = 43,560 square feet. To calculate acres: divide square feet by 43,560, or multiply length × width (in feet) ÷ 43,560. Example: 200 ft × 300 ft = 60,000 sq ft ÷ 43,560 = 1.38 acres.
Metric Conversion: 1 acre = 0.4047 hectares (or ~4,047 m²). For quick estimates: acres × 0.4 ≈ hectares. Land deals often use hectares internationally, so always verify units to avoid 2.5× pricing errors.
Lot Size Guide: Typical residential lots: Urban 0.1-0.2 acres, Suburban 0.25-0.5 acres, Rural 1-5+ acres. Minimum lot sizes vary by zoning—check local regulations before purchasing. Larger lots offer privacy but higher maintenance costs.
Visualize Acreage: 1 acre ≈ 75% of a football field or 16 tennis courts. A square acre is 209 ft × 209 ft. Helps estimate if land fits your needs (house + yard + garden).
Price Per Acre Varies Widely: Urban: $100K-$1M+/acre. Suburban: $50K-$200K/acre. Rural: $2K-$50K/acre. Agricultural: $3K-$12K/acre. Always compare $/acre for similar zoning and location before buying.

Essential Fundamentals — Acre basics & conversions

Acre Measurement Standards

Standard Definition: 1 acre = 43,560 square feet exactly. Defined as rectangular plot 660ft × 66ft (or any equivalent area). International standard since 1959 (International Yard and Pound Agreement).
Historical Origin: Medieval English farming unit. One acre = amount of land tillable by single oxen team in one day. Derived from "aker" (field in Old English). Modern definition standardized for consistency.
Visualization Methods: Square acre ≈ 209ft × 209ft. American football field (with end zones) = 1.32 acres (57,600 sq ft). 16 tennis courts = 1 acre. 4 suburban house lots (0.25 acre each) = 1 acre.
Survey Precision: Professional surveys accurate to ±0.1 ft. GPS-based surveys ±1-3 ft. Legal descriptions use metes and bounds (precise measurements from landmarks). Always hire licensed surveyor for property transactions.

Imperial & Metric Conversions

Imperial Units: 1 acre = 43,560 sq ft = 4,840 sq yards = 1/640 sq mile. 640 acres = 1 section (1 sq mile). 36 sections = 1 township (6mi × 6mi). Used primarily in US, UK (partially), Myanmar.
Metric Units: 1 acre = 4,046.86 sq meters = 0.4047 hectares = 0.004047 sq km. 1 hectare = 2.471 acres = 10,000 sq meters. Metric is international standard for agriculture, forestry, environmental studies.
Conversion Formulas: Acres to hectares: multiply by 0.404686. Hectares to acres: multiply by 2.47105. Acres to sq ft: multiply by 43,560. Sq ft to acres: divide by 43,560. Acres to sq miles: divide by 640.
Precision Requirements: Legal documents: Use exact conversion (0.404686, not 0.4). Estimations: 1 acre ≈ 0.4 hectares (1% error acceptable). Real estate: Round to 0.01 acre for listings. Agricultural: Use hectares (whole numbers easier than decimal acres).

Advanced Strategies — Land optimization

Property Size Planning

Residential Lot Standards: Tiny house: 0.1-0.25 acres. Single-family: 0.15-0.5 acres. Large estate: 1-5 acres. Zoning minimums vary: Urban 5,000 sq ft (0.11 acres), Suburban 10,000-15,000 sq ft (0.23-0.34 acres), Rural 1-5 acres.
Usable vs Total Area: Setback requirements reduce usable space 15-30%. Example: 0.5 acre lot with 25ft setbacks = only 0.3 acres buildable. Factor in: Driveways, utilities, drainage easements, buffers. Effective area often 60-70% of total.
Agricultural Planning: Vegetable garden (family of 4): 0.25 acres sufficient. Small farm (chickens, goats, vegetables): 2-5 acres. Livestock (horses, cattle): 1-2 acres per animal (rotational grazing). Commercial farming: 40+ acres minimum for viability.

Frequently Asked Questions

How many square feet are in an acre?: One acre equals exactly 43,560 square feet. This standardized measurement equals a square roughly 209 feet on each side, or about 90% of a football field.
How do I convert acres to hectares?: Multiply acres by 0.404686 to get hectares. For reverse conversion, multiply hectares by 2.47105 to get acres.
What is the difference between acres and square miles?: One square mile equals 640 acres. Acres are used for smaller properties like residential lots and farms, while square miles measure larger areas like cities and counties.
How much land do I need for a house?: A typical suburban single-family home requires 0.15-0.5 acres. Urban lots are smaller (0.1-0.25 acres), while rural properties often start at 1+ acres for more privacy and space.
What can I do with 1 acre of land?: One acre (43,560 sq ft) can accommodate a large home with extensive landscaping, a small farm with vegetables and livestock, recreational facilities like tennis courts, or commercial uses like storage units or event venues.
Is an acre the same as a hectare?: No, they differ in size and origin. One acre equals 0.405 hectares, while one hectare equals 2.47 acres. Hectares are used internationally (metric system), while acres are primarily used in the United States.