Use this free online calculator to convert Square Millimeter to Barn instantly. This area conversion tool provides accurate results for all your measurement needs.

Quick Reference

1 Square Millimeter = 1e+22 Barn

1 Barn = 1.000e-22 Square Millimeter

Square Millimeter to Barn Conversion Formula

To convert Square Millimeter to Barn, multiply by 1e+22.

Barn = Square Millimeter × 1e+22

Square Millimeter = Barn × 1.000e-22

To convert Barn back to Square Millimeter, divide by 1e+22 (or multiply by 1.000e-22).

About These Units

About Square Millimeter

The square millimeter is a metric unit of area equal to the area of a square with sides of one millimeter. It is commonly used for measuring small areas in engineering, manufacturing, and scientific applications.

About Barn

The Barn is a slightly humorous unit of area used in nuclear physics. When atoms are bombarded with smaller particles such as electrons, the electrons are scattered as if the nucleus of the atom was a tiny solid object. The barn is used to express the apparent cross-sectional area of this scattering object. One barn is equal to 1E-28 square meters. Using this unit, physicists can say that such and such a nucleus is "as big as a barn", or 10 barns, or whatever. The proper SI unit to use for these measurements is the square femtometer (fm2); one barn equals 100 fm2.

Square Millimeter to Barn Conversion Table

Square Millimeter	Barn	Barn	Square Millimeter
0.1	1e+21	0.1	1.000e-23
0.5	5e+21	0.5	5.000e-23
1	1e+22	1	1.000e-22
2	2e+22	2	2.000e-22
5	5e+22	5	5.000e-22
10	1e+23	10	1.000e-21
20	2e+23	20	2.000e-21
25	2.5e+23	25	2.500e-21
50	5e+23	50	5.000e-21
100	1e+24	100	1.000e-20
250	2.5e+24	250	2.500e-20
500	5e+24	500	5.000e-20
1000	1e+25	1000	1.000e-19

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