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Definition Conversion Table Similar Conversions Area units

Area units calculator & converter tool

Are Conversions Table

Equivalent of 4 Are:

400 m2 (Square meter)

4000000 cm2 (Square centimeter)

40000 dm2 (Square decimeter)

400000000 mm2 (Square milimeter)

0.0004 km2 (Square Kilometer)

0.04 Hectare

0.4 Decare

400 Centiare

0.117002 Arpent

400000 Barn

4305.56 Square feet

0.098842 Acre

15.81476 Square perche

0.00015444 Square mil

478.396 Square yard

620001.8510385 Square inch

4.292E-6 Canton

0.0006176 Homestead

0.39536 Rood

Are / Barn Units Definition

Are
Are, unit of area in the metric system, equal to 100 square meters and the equivalent of 0.0247 acre. Its multiple, the hectare (equal to 100 ares), is the primary unit of land measurement for most of the world. The are was the basic unit of area when the metric system was first decreed in France in 1795. When the International System of Units (SI) was adopted in 1960, the square meter replaced the are as the unit of area, but the International Bureau of Weights and Measures accepted the hectare as the common unit that can be used with the SI.
Barn
A barn (symbol: b) is a metric unit of area equal to 10-28 m2 (100 fm2). Originally used in nuclear physics to express the cross section of nuclei and nuclear reactions, it is also used today in all areas of high energy physics to express the cross sections of any diffusion process, and is best understood as a measure of the probability of interaction between small particles. A barn corresponds approximately to the cross section of a uranium nucleus. The barn is also the unit of area used in nuclear quadrupole resonance and nuclear magnetic resonance to quantify the interaction of a nucleus with an electric field gradient. Although the barn was never an SI unit, the SI standards body recognized it in the 8th SI brochure (replaced 2019) due to its use in particle physics.

Area units conversion

m2 <--> cm2

m2 <--> dm2

m2 <--> mm2

m2 <--> km2

m2 <--> hectare

m2 <--> are

m2 <--> centiare

m2 <--> barn

m2 <--> acre

m2 <--> perche2

m2 <--> homestead

m2 <--> rood

cm2 <--> dm2

cm2 <--> mm2

cm2 <--> km2

cm2 <--> hectare

cm2 <--> are

cm2 <--> decare

cm2 <--> centiare

cm2 <--> arpent

cm2 <--> perche2

cm2 <--> mille2

cm2 <--> pouce2

cm2 <--> canton

cm2 <--> homestead

dm2 <--> mm2

dm2 <--> km2

dm2 <--> hectare

dm2 <--> are

dm2 <--> decare

dm2 <--> centiare

dm2 <--> arpent

dm2 <--> perche2

dm2 <--> mille2

dm2 <--> pouce2

dm2 <--> canton

dm2 <--> homestead

mm2 <--> km2

mm2 <--> hectare

mm2 <--> are

mm2 <--> decare

mm2 <--> centiare

mm2 <--> arpent

mm2 <--> perche2

mm2 <--> mille2

mm2 <--> pouce2

mm2 <--> canton

mm2 <--> homestead

km2 <--> hectare

km2 <--> are

km2 <--> decare

km2 <--> centiare

km2 <--> arpent

km2 <--> perche2

km2 <--> mille2

km2 <--> pouce2

km2 <--> canton

km2 <--> homestead

hectare <--> are

hectare <--> decare

hectare <--> centiare

hectare <--> arpent

hectare <--> barn

hectare <--> feet2

hectare <--> acre

hectare <--> perche2

hectare <--> mille2

hectare <--> yard2

hectare <--> pouce2

hectare <--> canton

hectare <--> homestead

hectare <--> rood

are <--> decare

are <--> centiare

are <--> arpent

are <--> perche2

are <--> mille2

are <--> pouce2

are <--> canton

are <--> homestead

decare <--> centiare

decare <--> arpent

decare <--> barn

decare <--> feet2

decare <--> acre

decare <--> perche2

decare <--> mille2

decare <--> yard2

decare <--> pouce2

decare <--> canton

decare <--> homestead

decare <--> rood

centiare <--> arpent

centiare <--> barn

centiare <--> feet2

centiare <--> acre

centiare <--> perche2

centiare <--> mille2

centiare <--> yard2

centiare <--> pouce2

centiare <--> canton

centiare <--> homestead

centiare <--> rood

arpent <--> barn

arpent <--> feet2

arpent <--> acre

arpent <--> perche2

arpent <--> mille2

arpent <--> yard2

arpent <--> pouce2

arpent <--> canton

arpent <--> homestead

arpent <--> rood

barn <--> feet2

barn <--> perche2

barn <--> mille2

barn <--> yard2

barn <--> pouce2

barn <--> canton

barn <--> homestead

feet2 <--> acre

feet2 <--> perche2

feet2 <--> mille2

feet2 <--> yard2

feet2 <--> pouce2

feet2 <--> canton

feet2 <--> homestead

feet2 <--> rood

acre <--> perche2

acre <--> mille2

acre <--> yard2

acre <--> pouce2

acre <--> canton

acre <--> homestead

perche2 <--> mille2

perche2 <--> yard2

perche2 <--> pouce2

perche2 <--> canton

perche2 <--> homestead

perche2 <--> rood

mille2 <--> yard2

mille2 <--> pouce2

mille2 <--> canton

mille2 <--> homestead

mille2 <--> rood

yard2 <--> pouce2

yard2 <--> canton

yard2 <--> homestead

yard2 <--> rood

pouce2 <--> canton

pouce2 <--> homestead

pouce2 <--> rood

canton <--> homestead

canton <--> rood

homestead <--> rood