| 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 |
| board | 12 bd | 24 bd | 36 bd | 48 bd | 60 bd | 72 bd | 84 bd | 96 bd | 108 bd | 120 bd | 132 bd | 144 bd | 156 bd | 168 bd | 180 bd | 192 bd | 204 bd | 216 bd | 228 bd | 240 bd | 252 bd | 264 bd | 276 bd | 288 bd | 300 bd | 312 bd | 324 bd | 336 bd | 348 bd | 360 bd | 372 bd | 384 bd | 396 bd | 408 bd | 420 bd | 432 bd | 444 bd | 456 bd | 468 bd | 480 bd | 492 bd | 504 bd | 516 bd | 528 bd | 540 bd | 552 bd | 564 bd | 576 bd | 588 bd | 600 bd | 612 bd | 624 bd | 636 bd | 648 bd | 660 bd | 672 bd | 684 bd | 696 bd | 708 bd | 720 bd | 732 bd | 744 bd | 756 bd | 768 bd | 780 bd | 792 bd | 804 bd | 816 bd | 828 bd | 840 bd | 852 bd | 864 bd | 876 bd | 888 bd | 900 bd | 912 bd | 924 bd | 936 bd | 948 bd | 960 bd | 972 bd | 984 bd | 996 bd | 1 008 bd | 1 020 bd | 1 032 bd | 1 044 bd | 1 056 bd | 1 068 bd | 1 080 bd | 1 092 bd | 1 104 bd | 1 116 bd | 1 128 bd | 1 140 bd | 1 152 bd | 1 164 bd | 1 176 bd | 1 188 bd | 1 200 bd |
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 | boards | square feet | boards |
|---|---|---|---|
| 1 | ≡ 12 | 6 | ≡ 72 |
| 2 | ≡ 24 | 7 | ≡ 84 |
| 3 | ≡ 36 | 8 | ≡ 96 |
| 4 | ≡ 48 | 9 | ≡ 108 |
| 5 | ≡ 60 | 10 | ≡ 120 |
Board is a unit of area.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| board | bd | ≡ 1 in × 1 ft | ≡ 7.74192×10−3 m2 | Other |
| boards | square feet | boards | square feet |
|---|---|---|---|
| 1 | ≡ 0.083333333333333 | 6 | ≡ 0.5 |
| 2 | ≡ 0.16666666666667 | 7 | ≡ 0.58333333333333 |
| 3 | ≡ 0.25 | 8 | ≡ 0.66666666666667 |
| 4 | ≡ 0.33333333333333 | 9 | ≡ 0.75 |
| 5 | ≡ 0.41666666666667 | 10 | ≡ 0.83333333333333 |
| square feet | boards |
|---|---|
| 1 | ≡ 12 |
| 0.0833333 | ≡ 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 …) |