| square foot | 1 sq ft | 2 sq ft | 3 sq ft | 4 sq ft | 5 sq ft | 6 sq ft | 7 sq ft | 8 sq ft | 9 sq ft | 10 sq ft | 11 sq ft | 12 sq ft | 13 sq ft | 14 sq ft | 15 sq ft | 16 sq ft | 17 sq ft | 18 sq ft | 19 sq ft | 20 sq ft | 21 sq ft | 22 sq ft | 23 sq ft | 24 sq ft | 25 sq ft | 26 sq ft | 27 sq ft | 28 sq ft | 29 sq ft | 30 sq ft | 31 sq ft | 32 sq ft | 33 sq ft | 34 sq ft | 35 sq ft | 36 sq ft | 37 sq ft | 38 sq ft | 39 sq ft | 40 sq ft | 41 sq ft | 42 sq ft | 43 sq ft | 44 sq ft | 45 sq ft | 46 sq ft | 47 sq ft | 48 sq ft | 49 sq ft | 50 sq ft | 51 sq ft | 52 sq ft | 53 sq ft | 54 sq ft | 55 sq ft | 56 sq ft | 57 sq ft | 58 sq ft | 59 sq ft | 60 sq ft | 61 sq ft | 62 sq ft | 63 sq ft | 64 sq ft | 65 sq ft | 66 sq ft | 67 sq ft | 68 sq ft | 69 sq ft | 70 sq ft | 71 sq ft | 72 sq ft | 73 sq ft | 74 sq ft | 75 sq ft | 76 sq ft | 77 sq ft | 78 sq ft | 79 sq ft | 80 sq ft | 81 sq ft | 82 sq ft | 83 sq ft | 84 sq ft | 85 sq ft | 86 sq ft | 87 sq ft | 88 sq ft | 89 sq ft | 90 sq ft | 91 sq ft | 92 sq ft | 93 sq ft | 94 sq ft | 95 sq ft | 96 sq ft | 97 sq ft | 98 sq ft | 99 sq ft | 100 sq ft |
| barn | 9.290304 × 1026 b | 1.8580608 × 1027 b | 2.7870912 × 1027 b | 3.7161216 × 1027 b | 4.645152 × 1027 b | 5.5741824 × 1027 b | 6.5032128 × 1027 b | 7.4322432 × 1027 b | 8.3612736 × 1027 b | 9.290304 × 1027 b | 1.02193344 × 1028 b | 1.11483648 × 1028 b | 1.20773952 × 1028 b | 1.30064256 × 1028 b | 1.3935456 × 1028 b | 1.48644864 × 1028 b | 1.57935168 × 1028 b | 1.67225472 × 1028 b | 1.76515776 × 1028 b | 1.8580608 × 1028 b | 1.95096384 × 1028 b | 2.04386688 × 1028 b | 2.13676992 × 1028 b | 2.22967296 × 1028 b | 2.322576 × 1028 b | 2.41547904 × 1028 b | 2.50838208 × 1028 b | 2.60128512 × 1028 b | 2.69418816 × 1028 b | 2.7870912 × 1028 b | 2.87999424 × 1028 b | 2.97289728 × 1028 b | 3.06580032 × 1028 b | 3.15870336 × 1028 b | 3.2516064 × 1028 b | 3.34450944 × 1028 b | 3.43741248 × 1028 b | 3.53031552 × 1028 b | 3.62321856 × 1028 b | 3.7161216 × 1028 b | 3.80902464 × 1028 b | 3.90192768 × 1028 b | 3.99483072 × 1028 b | 4.08773376 × 1028 b | 4.1806368 × 1028 b | 4.27353984 × 1028 b | 4.36644288 × 1028 b | 4.45934592 × 1028 b | 4.55224896 × 1028 b | 4.645152 × 1028 b | 4.73805504 × 1028 b | 4.83095808 × 1028 b | 4.92386112 × 1028 b | 5.01676416 × 1028 b | 5.1096672 × 1028 b | 5.20257024 × 1028 b | 5.29547328 × 1028 b | 5.38837632 × 1028 b | 5.48127936 × 1028 b | 5.5741824 × 1028 b | 5.66708544 × 1028 b | 5.75998848 × 1028 b | 5.85289152 × 1028 b | 5.94579456 × 1028 b | 6.0386976 × 1028 b | 6.13160064 × 1028 b | 6.22450368 × 1028 b | 6.31740672 × 1028 b | 6.41030976 × 1028 b | 6.5032128 × 1028 b | 6.59611584 × 1028 b | 6.68901888 × 1028 b | 6.78192192 × 1028 b | 6.87482496 × 1028 b | 6.967728 × 1028 b | 7.06063104 × 1028 b | 7.15353408 × 1028 b | 7.24643712 × 1028 b | 7.33934016 × 1028 b | 7.4322432 × 1028 b | 7.52514624 × 1028 b | 7.61804928 × 1028 b | 7.71095232 × 1028 b | 7.80385536 × 1028 b | 7.8967584 × 1028 b | 7.98966144 × 1028 b | 8.08256448 × 1028 b | 8.17546752 × 1028 b | 8.26837056 × 1028 b | 8.3612736 × 1028 b | 8.45417664 × 1028 b | 8.54707968 × 1028 b | 8.63998272 × 1028 b | 8.73288576 × 1028 b | 8.8257888 × 1028 b | 8.91869184 × 1028 b | 9.01159488 × 1028 b | 9.10449792 × 1028 b | 9.19740096 × 1028 b | 9.290304 × 1028 b |
The square foot (plural square feet; abbreviated sq ft, sf, ft2) is an imperial unit and U.S. customary unit (non-SI, non-metric) of area, used mainly in the United States and partially in Bangladesh, Canada, Ghana, Hong Kong, India, Malaysia, Nepal, Pakistan, Singapore and the United Kingdom. It is defined as the area of a square with sides of 1 foot.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| square foot | sq ft | ≡ 1 ft × 1 ft | ≡ 9.290304×10−2 m2 | Imperial/US |
| square feet | barns | square feet | barns |
|---|---|---|---|
| 1 | ≡ 9.290304E+26 | 6 | ≡ 5.5741824E+27 |
| 2 | ≡ 1.8580608E+27 | 7 | ≡ 6.5032128E+27 |
| 3 | ≡ 2.7870912E+27 | 8 | ≡ 7.4322432E+27 |
| 4 | ≡ 3.7161216E+27 | 9 | ≡ 8.3612736E+27 |
| 5 | ≡ 4.645152E+27 | 10 | ≡ 9.290304E+27 |
A barn (symbol: b) is a unit of area equal to 10−28 m2 (100 fm2). Originally used in nuclear physics for expressing the cross sectional area of nuclei and nuclear reactions, today it is also used in all fields of high-energy physics to express the cross sections of any scattering process, and is best understood as a measure of the probability of interaction between small particles.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| barn | b | ≡ 10−28 m2 | ≡ 10−28 m2 | Nuclear Physics |
| barns | square feet | barns | square feet |
|---|---|---|---|
| 1 | ≡ 1.076391041671E-27 | 6 | ≡ 6.4583462500258E-27 |
| 2 | ≡ 2.1527820833419E-27 | 7 | ≡ 7.5347372916968E-27 |
| 3 | ≡ 3.2291731250129E-27 | 8 | ≡ 8.6111283333678E-27 |
| 4 | ≡ 4.3055641666839E-27 | 9 | ≡ 9.6875193750387E-27 |
| 5 | ≡ 5.3819552083549E-27 | 10 | ≡ 1.076391041671E-26 |
| square feet | barns |
|---|---|
| 1 | ≡ 9.290304 × 1026 |
| 1.076391041671 × 10-27 | ≡ 1 |
| Symbol | Definition |
|---|---|
| ≡ | exactly equal |
| ≈ | approximately equal to |
| = | equal to |
| digits | indicates that digits repeat infinitely (e.g. 8.294 369 corresponds to 8.294 369 369 369 369 …) |