Area units calculator & converter tool
Acre Conversions Table
Equivalent of 3 Acre: |
12140.588009146 m2 (Square meter) |
121405880.09146 cm2 (Square centimeter) |
1214058.8009146 dm2 (Square decimeter) |
12140588009.146 mm2 (Square milimeter) |
0.012140588009146 km2 (Square Kilometer) |
1.2140588009146 Hectare |
121.40588009146 Are |
12.140588009146 Decare |
12140.588009146 Centiare |
3.5511826956152 Arpent |
12140588.009146 Barn |
130680.07527165 Square feet |
480.0012140588 Square perche |
0.0046874810303312 Square mil |
14520.021853058 Square yard |
18817967.595916 Square inch |
0.00013026850933814 Canton |
0.018745067886121 Homestead |
11.99975718824 Rood |
Acre / Barn Units Definition
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".
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.