Square Millimeter to Acre Conversion Calculator: Free Online Tool

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

From:

Square Millimeter

To:

Acre

How to Use the Calculator:

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

How to Convert Square Millimeter to Acre

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

Formula:

1 Square Millimeter = 2.4711e-10 acres

Example Calculation:

Convert 10 square millimeters: 10 × 2.4711e-10 = 2.4711e-9 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 Millimeter and a Acre?

The square millimeter (symbol: mm²) is a unit of area in the metric system. It represents the area of a square with sides that are each one millimeter 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 Millimeter is part of the metric (SI) system, primarily used globally in science and trade. The Acre belongs to the imperial/US customary system.

History of the Square Millimeter and Acre

Derived from the millimeter (one-thousandth of a meter), the square millimeter arose with the metric system as a unit for measuring extremely small areas, particularly in scientific and technical fields requiring high precision.

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 millimeters and acres

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

Common Uses for square millimeters

Engineering & Manufacturing: Specifying tolerances, cross-sectional areas of fine wires or fibers, surface areas of micro-components.
Material Science: Measuring grain sizes, or the area of microscopic features.
Electronics: Defining the area of pads or traces on printed circuit boards (PCBs).
Optics: Measuring the area of small apertures or sensor elements.

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 Millimeter (mm²)

How many square millimeters are in a square centimeter?

There are 100 square millimeters in one square centimeter (cm²).

Is mm² used for everyday measurements?

No, it is generally too small for everyday use. Square centimeters (cm²) or square meters (m²) are more practical for common objects.

How does mm² relate to the square meter?

One square meter contains 1,000,000 square millimeters.

Is mm² an SI unit?

It is derived from the SI base unit meter and is a standard metric unit for area.

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 Millimeter to Acre

Square Millimeter (mm²)	Acre (acre)
1	0
5	0
10	0
25	0
50	0
100	0
500	0
1,000	0

All Area Conversions

Square Meter to Square Kilometer Square Meter to Square Centimeter Square Meter to Square Millimeter Square Meter to Square Inch Square Meter to Square Foot Square Meter to Square Yard Square Meter to Square Mile Square Meter to Acre Square Meter to Hectare Square Kilometer to Square Meter Square Kilometer to Square Centimeter Square Kilometer to Square Millimeter Square Kilometer to Square Inch Square Kilometer to Square Foot Square Kilometer to Square Yard Square Kilometer to Square Mile Square Kilometer to Acre Square Kilometer to Hectare Square Centimeter to Square Meter Square Centimeter to Square Kilometer Square Centimeter to Square Millimeter Square Centimeter to Square Inch Square Centimeter to Square Foot Square Centimeter to Square Yard Square Centimeter to Square Mile Square Centimeter to Acre Square Centimeter to Hectare Square Millimeter to Square Meter Square Millimeter to Square Kilometer Square Millimeter to Square Centimeter Square Millimeter to Square Inch Square Millimeter to Square Foot Square Millimeter to Square Yard Square Millimeter to Square Mile Square Millimeter to Hectare Square Inch to Square Meter Square Inch to Square Kilometer Square Inch to Square Centimeter Square Inch to Square Millimeter Square Inch to Square Foot Square Inch to Square Yard Square Inch to Square Mile Square Inch to Acre Square Inch to Hectare Square Foot to Square Meter Square Foot to Square Kilometer Square Foot to Square Centimeter Square Foot to Square Millimeter Square Foot to Square Inch Square Foot to Square Yard Square Foot to Square Mile Square Foot to Acre Square Foot to Hectare Square Yard to Square Meter Square Yard to Square Kilometer Square Yard to Square Centimeter Square Yard to Square Millimeter Square Yard to Square Inch Square Yard to Square Foot Square Yard to Square Mile Square Yard to Acre Square Yard to Hectare Square Mile to Square Meter Square Mile to Square Kilometer Square Mile to Square Centimeter Square Mile to Square Millimeter Square Mile to Square Inch Square Mile to Square Foot Square Mile to Square Yard Square Mile to Acre Square Mile to Hectare Acre to Square Meter Acre to Square Kilometer Acre to Square Centimeter Acre to Square Millimeter Acre to Square Inch Acre to Square Foot Acre to Square Yard Acre to Square Mile Acre to Hectare Hectare to Square Meter Hectare to Square Kilometer Hectare to Square Centimeter Hectare to Square Millimeter Hectare to Square Inch Hectare to Square Foot Hectare to Square Yard Hectare to Square Mile Hectare to Acre