Length · Unit Converter

Convert Are to Square Inch

Convert ares to square inches instantly. 1 are = 155000.31000062 square inch — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Square Inch to Are converter for the reverse conversion.

Written by Sunith Babu L, Ph.D., Lead Engineer Reviewed by Girish V Kulkarni Ph.D.

Length category 2 min read Published June 6, 2026 Last reviewed June 6, 2026 Updated June 6, 2026

Units explained

Metric / SI

Are

What is a are?

An are is a metric unit of area equal to 100 square meters. It is used in some European countries for land measurement, especially for smaller plots like vineyards and gardens.

Origin of the are

Introduced as part of the French metric system in 1795. The name comes from the Latin 'area' meaning surface or open ground.

Where it is used

Ares are still used in some European countries (especially Switzerland and France) for small-plot land measurement. In Switzerland, an are is a common unit for vineyard size. Most modern contexts prefer square meters or hectares.

When and where it was developed

Defined in 1795 in France as part of the original metric system.

Imperial / US Customary

Square Inch

What is a square inch?

A square inch is an imperial unit of area equal to exactly 0.00064516 m², the area of a square with sides of one inch. It is widely used in the United States for small-area measurements.

Origin of the square inch

Derived by squaring the inch. The inch was standardized to exactly 25.4 mm via the 1959 International Yard and Pound Agreement.

Where it is used

Square inches are used extensively in US engineering, manufacturing, real estate (for floor plans), and everyday small-area measurements. Engine displacement is often expressed in cubic inches but cross-sections in square inches.

When and where it was developed

Inch dates to medieval English usage; modern exact value standardized in 1959.

Are to Square Inch conversion formula

The relationship between ares and square inches:

1 a = 155000.31000062 in²

1 in² = 6.4516e-6 a

To convert ares to square inches, multiply the value in ares by 155000.31000062. To reverse, multiply square inches by 6.4516e-6.

How to use this converter

Type a value into the calculator. The result in square inches updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Square Inch to Are converter for the reverse direction.

Step-by-step: convert ares to square inches

Write down the value in ares (a).
Multiply that value by the factor 155000.31000062.
The product is the equivalent value in square inches (in²).
To reverse, multiply the square inch value by 6.4516e-6.

Worked examples

Example 1 — Convert 1 a to in²:
1 × 155000.31000062 = 155000.31000062 in²

Example 2 — Convert 100 a to in²:
100 × 155000.31000062 = 1.550003e+7 in²

Are to Square Inch conversion table

Standard reference values for converting ares to square inches:

Are [a]	Square Inch [in²]
0.01	1550.0031000062
0.1	15500.031000062
1	155000.31000062
2	310000.62000124
3	465000.93000186
4	620001.24000248
5	775001.5500031
10	1550003.1000061999
20	3100006.2000123998
30	4650009.3000186002
40	6200012.4000247996
50	7750015.500031
100	1.550003e+7
500	7.750016e+7
1000	1.550003e+8

Frequently asked questions

How many square inches is 1 are?

1 are equals 155000.31000062 square inch.

How do I convert ares to square inches?

Multiply the value in ares by 155000.31000062 to get square inches.

How do I convert square inches back to ares?

Multiply the value in square inches by 6.4516e-6, or use the Square Inch to Are converter.

How many square inches is 100 ares?

100 ares equals 1.550003e+7 square inches, because 100 × 155000.31000062 = 1.550003e+7.

Popular area unit conversions

ac → ft² m² → ft² ha → ac bigha → ft² ft² → m² ac → ha guntha → ft² ct → ft² ac → m² cm² → in² m² → ac km² → mi²

Convert Are to other area units

Show all Are conversions

Metric / SI (15 units)

Are to Square Yoctometer (ym²) Are to Square Zeptometer (zm²) Are to Square Attometer (am²) Are to Square Femtometer (fm²) Are to Square Picometer (pm²) Are to Square Nanometer (nm²) Are to Square Micrometer (µm²) Are to Square Millimeter (mm²) Are to Square Centimeter (cm²) Are to Square Decimeter (dm²) Are to Square Meter (m²) Are to Square Dekameter (dam²) Are to Square Hectometer (hm²) Are to Hectare (ha) Are to Square Kilometer (km²)

Imperial / US Customary (3 units)

Are to Square Inch (in²) Are to Square Foot (ft²) Are to Acre (ac)

Sources & references

Conversion factor (1 a = 155000.31000062 in²) verified against the following authoritative sources:

BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.

Results are provided for general reference. Verify critical measurements against an authoritative standard.