Length · Unit Converter

Convert Are to Square Femtometer

Convert ares to square femtometers instantly. 1 are = 1e+32 square femtometer — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Square Femtometer 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 Last reviewed Updated

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.

Metric / SI

Square Femtometer

What is a square femtometer?

A square femtometer is a metric unit of area equal to 10⁻³⁰ m². It is used in nuclear and particle physics to describe interaction cross-sections at the nuclear scale.

Origin of the square femtometer

Derived by squaring the femtometer (10⁻¹⁵ m), historically known as the fermi after physicist Enrico Fermi.

Where it is used

Square femtometers are equivalent to 0.01 barn. They appear in particle physics literature comparing strong interaction cross-sections and hadron sizes.

When and where it was developed

Femtometer adopted into SI in 1964; the fermi nomenclature predates this from mid-20th century nuclear physics.

Are to Square Femtometer conversion formula

The relationship between ares and square femtometers:

1 a = 1e+32 fm²
1 fm² = 1e-32 a

To convert ares to square femtometers, multiply the value in ares by 1e+32. To reverse, multiply square femtometers by 1e-32.

How to use this converter

Type a value into the calculator. The result in square femtometers 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 Femtometer to Are converter for the reverse direction.

Step-by-step: convert ares to square femtometers

  1. Write down the value in ares (a).
  2. Multiply that value by the factor 1e+32.
  3. The product is the equivalent value in square femtometers (fm²).
  4. To reverse, multiply the square femtometer value by 1e-32.

Worked examples

Example 1 — Convert 1 a to fm²:
1 × 1e+32 = 1e+32 fm²

Example 2 — Convert 100 a to fm²:
100 × 1e+32 = 1e+34 fm²

Are to Square Femtometer conversion table

Standard reference values for converting ares to square femtometers:

Are [a]Square Femtometer [fm²]
0.011e+30
0.11e+31
11e+32
22e+32
33e+32
44e+32
55e+32
101e+33
202e+33
303e+33
404e+33
505e+33
1001e+34
5005e+34
10001e+35

Frequently asked questions

How many square femtometers is 1 are?
1 are equals 1e+32 square femtometer.
How do I convert ares to square femtometers?
Multiply the value in ares by 1e+32 to get square femtometers.
How do I convert square femtometers back to ares?
Multiply the value in square femtometers by 1e-32, or use the Square Femtometer to Are converter.
How many square femtometers is 100 ares?
100 ares equals 1e+34 square femtometers, because 100 × 1e+32 = 1e+34.

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 = 1e+32 fm²) verified against the following authoritative sources:

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