Square Feet to Acres Converter

Convert between square feet (ft²) and acres in one click, with automatic equivalents in square metres (m²) and hectares (ha). Built for real estate professionals, surveyors, architects and landowners who need accurate, documented conversions.

Uses the exact definition 1 acre = 43,560 square feet, with SI-consistent conversions for m² and ha.

Square feet ⇄ acres area converter

Exact 43,560 ft²/acre
Conversion direction

Useful for lot sizes from small residential plots to larger commercial properties.

Results

Square feet (ft²):
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Acres:
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Square metres (m²):
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Hectares (ha):
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Enter a value and click “Convert area” to compute the equivalent in square feet, acres, square metres and hectares.

Square feet to acres – quick reference table

Use this table for fast estimates when screening lots, agricultural parcels or land development scenarios.

Square feet (ft²) Acres Square metres (m²) Hectares (ha)

1 acre = 43,560 ft² ≈ 4,046.856 m² ≈ 0.404686 ha. Values in the table are rounded for readability.

What is an acre, and how does it relate to square feet?

The acre is a traditional unit of land area used in the United States, the UK and several other countries. In its modern (international) definition:

Exact definitions

1 acre = 43,560 square feet

1 acre ≈ 4,046.8564224 m² ≈ 0.40468564224 hectares

The factor 43,560 ft² comes from the historical definition of an acre as a rectangle 66 feet wide by 660 feet long (a chain by a furlong). This relationship is still used today in real estate contracts, land registry documents and planning rules.

Key relationships at a glance

  • 1 acre = 43,560 ft²
  • 1 ft² = 1 / 43,560 acres ≈ 0.0000229568 acres
  • 1 acre ≈ 4,046.8564 m²
  • 1 acre ≈ 0.4046856 ha
  • 1 ha = 10,000 m² ≈ 2.47105 acres

Formulas used by this square feet ⇄ acres calculator

Square feet to acres

Formula

acres = square feet ÷ 43,560

Example: 10,000 ft² ÷ 43,560 ≈ 0.2296 acres.

Acres to square feet

Formula

square feet = acres × 43,560

Example: 0.75 acres × 43,560 = 32,670 ft².

Square feet and acres to square metres and hectares

Formulas

square metres = square feet × 0.09290304
hectares = square metres ÷ 10,000

Combining with the acre definition:
square metres ≈ acres × 4,046.8564224
hectares ≈ acres ÷ 2.4710538147

Practical examples

Example 1 – How many acres is a 60 × 120 ft lot?

  1. Compute the area in ft²: 60 × 120 = 7,200 ft².
  2. Convert to acres: 7,200 ÷ 43,560 ≈ 0.165 acres.
  3. Convert to m²: 7,200 × 0.09290304 ≈ 669.7 m².

Example 2 – Convert 2.5 acres to square feet and m²

  1. Square feet: 2.5 × 43,560 = 108,900 ft².
  2. Square metres: 2.5 × 4,046.8564224 ≈ 10,117.1 m².
  3. Hectares: 10,117.1 ÷ 10,000 ≈ 1.0117 ha.

Using square feet and acres in real projects

Real estate, construction and land planning documents may express area in different units depending on country, sector and software defaults. As a rule of thumb:

  • Residential real estate (US) – property size often in acres, building area in square feet.
  • Engineering drawings – areas typically in m² or ft², even when overall parcel size is quoted in acres.
  • Agriculture & forestry – acres and hectares are both common, depending on local conventions.

This converter lets you quickly move between units, so you can keep your internal calculations in the metric system while publishing figures in acres or square feet where required by clients or regulation.

Accuracy, rounding and professional use

All calculations on this page use exact relationships for the imperial units and high-precision factors for metric conversions. Displayed values are rounded to a practical number of decimal places:

  • Acres: typically 4–6 decimal places for internal work, 2–3 for client-facing documents.
  • Square metres: 1–2 decimal places for parcels; more if required by engineering tolerances.
  • Hectares: 4 decimal places are usually sufficient for planning.

For legal surveys, subdivision plans and boundary disputes, always rely on certified survey data and local regulations. This tool is designed to support professional judgment, not replace it.

Frequently asked questions about square feet and acres

What is a good number of decimal places for acres? ▾
For internal calculations and engineering work, 4–6 decimal places in acres provide a comfortable margin. For property listings and client communication, 2–3 decimals (or even rounding to the nearest 0.01 acre) are often sufficient and easier to read.
How many square feet are in a quarter acre and a half acre? ▾
A quarter acre (0.25 acres) is 0.25 × 43,560 = 10,890 ft². A half acre (0.5 acres) is 0.5 × 43,560 = 21,780 ft². These two values are frequently used in residential lot sizing.
Can this tool handle very large farms or estates? ▾
Yes. The calculator works with very large numbers of square feet or acres, subject only to typical browser numeric limits. For very large tracts it is often clearer to express area in hectares or square kilometres as well, which this tool also provides.
Why do some planning documents use hectares instead of acres? ▾
Many jurisdictions follow the metric system for official statistics and planning, and define densities (such as dwellings per hectare) accordingly. Hectares integrate cleanly with m², and 1 ha = 10,000 m² is an easy conversion. This tool lets you translate those figures back into acres where needed.
Is this calculator enough for legal property boundary work? ▾
No. While the unit conversions are precise, legal property boundaries depend on survey monuments, legal descriptions, easements and local law. Always consult a licensed land surveyor or relevant authority for boundary and title questions.