UnitsConverter.io

Square Inch to Acre Conversion Calculator: Free Online Tool

Convert square inches to acres with our free online area converter.

Square Inch to Acre Calculator

Square Inch
Acre

How to Use the Calculator:

  1. Enter the value you want to convert in the 'From' field (Square Inch).
  2. The converted value in Acre will appear automatically in the 'To' field.
  3. Use the dropdown menus to select different units within the Area category.
  4. Click the swap button (⇌) to reverse the conversion direction.

How to Convert Square Inch to Acre

Converting Square Inch to Acre involves multiplying the value by a specific conversion factor, as shown in the formula below.

Formula:

1 Square Inch = 1.5942e-7 acres

Example Calculation:

Convert 10 square inches: 10 × 1.5942e-7 = 1.5942e-6 acres

Disclaimer: For Reference Only

These conversion results are provided for informational purposes only. While we strive for accuracy, we make no guarantees regarding the precision of these results, especially for conversions involving extremely large or small numbers which may be subject to the inherent limitations of standard computer floating-point arithmetic.

Not for professional use. Results should be verified before use in any critical application. View our Terms of Service for more information.

What is a Square Inch and a Acre?

The square inch (symbol: in², sq in) is an imperial and US customary unit of area. It represents the area of a square with sides that are each one inch long.

The acre (symbol: ac) is a unit of land area used in the imperial and US customary systems. It is traditionally defined as the area of one chain by one furlong (66 by 660 feet), which is exactly equal to 1/640 of a square mile, 43,560 square feet, or about 4,047 square meters.

Note: The Square Inch is part of the imperial/US customary system, primarily used in the US, UK, and Canada for everyday measurements. The Acre belongs to the imperial/US customary system.

History of the Square Inch and Acre

Derived from the inch, whose definition has varied historically but was standardized as 25.4 mm, the square inch became a common unit for small area measurements within the imperial system. It is frequently used in the US and UK for engineering and everyday measurements.

The acre originated in medieval England as the amount of land tillable by one man behind one ox in one day. Its size varied historically but was standardized under the Weights and Measures Act of 1878 in the UK. It remains a common unit for land measurement in several countries, especially for agricultural and large residential plots.

Common Uses for square inches and acres

Explore the typical applications for both Square Inch (imperial/US) and Acre (imperial/US) to understand their common contexts.

Common Uses for square inches

  • Engineering & Manufacturing (US/UK): Specifying the area of small components, cross-sections, or surface areas.
  • Material Measurement: Measuring the area of small sheets of material (e.g., paper, fabric samples).
  • Pressure Measurement: Used implicitly in units like pounds per square inch (psi).
  • Crafts & Hobbies: Measuring fabric squares, paper sizes, or small design areas.

Common Uses for acres

  • Land Measurement (US/UK etc.): Standard unit for measuring plots of land, especially farms, large residential lots, and undeveloped land in the US, UK, Canada, Australia, India, and other Commonwealth countries.
  • Real Estate: Used in property listings and surveys for land parcels.
  • Agriculture: Common unit for describing farm sizes and field areas.

Frequently Asked Questions

Questions About Square Inch (in²)

How many square inches are in a square foot?

There are 144 square inches in one square foot (12 inches x 12 inches).

How many square centimeters are in a square inch?

One square inch is equal to exactly 6.4516 square centimeters.

Is the square inch used for large areas?

No, it's used for small areas. Square feet (ft²) or square yards (yd²) are used for room sizes, and acres (ac) or square miles (mi²) for land.

Is the square inch an SI unit?

No, it is part of the imperial and US customary systems. The corresponding metric units are square centimeter (cm²) or square millimeter (mm²).

About Acre (acre)

How big is an acre visually?

An acre is roughly 90% of the size of an American football field (including the end zones).

How many square feet are in an acre?

There are exactly 43,560 square feet in one acre.

How many acres are in a hectare?

One hectare contains approximately 2.471 acres.

Is the acre used worldwide?

While common in the US, UK, and Commonwealth countries, it is not part of the metric system (SI) and is less common globally than the hectare or square meter for land measurement.

Conversion Table: Square Inch to Acre

Square Inch (in²)Acre (acre)
10
50
100
250
500
1000
5000
1,0000

All Area Conversions

Square Meter to Square KilometerSquare Meter to Square CentimeterSquare Meter to Square MillimeterSquare Meter to Square InchSquare Meter to Square FootSquare Meter to Square YardSquare Meter to Square MileSquare Meter to AcreSquare Meter to HectareSquare Kilometer to Square MeterSquare Kilometer to Square CentimeterSquare Kilometer to Square MillimeterSquare Kilometer to Square InchSquare Kilometer to Square FootSquare Kilometer to Square YardSquare Kilometer to Square MileSquare Kilometer to AcreSquare Kilometer to HectareSquare Centimeter to Square MeterSquare Centimeter to Square KilometerSquare Centimeter to Square MillimeterSquare Centimeter to Square InchSquare Centimeter to Square FootSquare Centimeter to Square YardSquare Centimeter to Square MileSquare Centimeter to AcreSquare Centimeter to HectareSquare Millimeter to Square MeterSquare Millimeter to Square KilometerSquare Millimeter to Square CentimeterSquare Millimeter to Square InchSquare Millimeter to Square FootSquare Millimeter to Square YardSquare Millimeter to Square MileSquare Millimeter to AcreSquare Millimeter to HectareSquare Inch to Square MeterSquare Inch to Square KilometerSquare Inch to Square CentimeterSquare Inch to Square MillimeterSquare Inch to Square FootSquare Inch to Square YardSquare Inch to Square MileSquare Inch to HectareSquare Foot to Square MeterSquare Foot to Square KilometerSquare Foot to Square CentimeterSquare Foot to Square MillimeterSquare Foot to Square InchSquare Foot to Square YardSquare Foot to Square MileSquare Foot to AcreSquare Foot to HectareSquare Yard to Square MeterSquare Yard to Square KilometerSquare Yard to Square CentimeterSquare Yard to Square MillimeterSquare Yard to Square InchSquare Yard to Square FootSquare Yard to Square MileSquare Yard to AcreSquare Yard to HectareSquare Mile to Square MeterSquare Mile to Square KilometerSquare Mile to Square CentimeterSquare Mile to Square MillimeterSquare Mile to Square InchSquare Mile to Square FootSquare Mile to Square YardSquare Mile to AcreSquare Mile to HectareAcre to Square MeterAcre to Square KilometerAcre to Square CentimeterAcre to Square MillimeterAcre to Square InchAcre to Square FootAcre to Square YardAcre to Square MileAcre to HectareHectare to Square MeterHectare to Square KilometerHectare to Square CentimeterHectare to Square MillimeterHectare to Square InchHectare to Square FootHectare to Square YardHectare to Square MileHectare to Acre

Other Units from Area