Area units calculator & converter tool
Barn Conversions Table
Equivalent of 1 Barn: |
0.001 m2 (Square meter) |
10 cm2 (Square centimeter) |
0.1 dm2 (Square decimeter) |
1000 mm2 (Square milimeter) |
1.0E-9 km2 (Square Kilometer) |
1.0E-7 Hectare |
1.0E-5 Are |
1.0E-6 Decare |
0.001 Centiare |
2.92505E-7 Arpent |
0.0107639 Square feet |
2.47105E-7 Acre |
3.95369E-5 Square perche |
3.861E-10 Square mil |
0.00119599 Square yard |
1.5500046275963 Square inch |
1.073E-11 Canton |
1.544E-9 Homestead |
9.884E-7 Rood |
Barn / Acre Units Definition
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.
Acre
The acre (/ˈeɪkər/ AY-kər) is a unit of land area used in the British imperial and the United States customary systems. It is traditionally defined as the area of one chain by one furlong (66 by 660 feet), which is exactly equal to 10 square chains, 1⁄640 of a square mile, 4,840 square yards, or 43,560 square feet, and approximately 4,047 m2, or about 40% of a hectare. Based upon the international yard and pound agreement of 1959, an acre may be declared as exactly 4,046.8564224 square metres. The acre is sometimes abbreviated ac but is usually spelled out as the word "acre".