foot | 1 ft | 2 ft | 3 ft | 4 ft | 5 ft | 6 ft | 7 ft | 8 ft | 9 ft | 10 ft | 11 ft | 12 ft | 13 ft | 14 ft | 15 ft | 16 ft | 17 ft | 18 ft | 19 ft | 20 ft | 21 ft | 22 ft | 23 ft | 24 ft | 25 ft | 26 ft | 27 ft | 28 ft | 29 ft | 30 ft | 31 ft | 32 ft | 33 ft | 34 ft | 35 ft | 36 ft | 37 ft | 38 ft | 39 ft | 40 ft | 41 ft | 42 ft | 43 ft | 44 ft | 45 ft | 46 ft | 47 ft | 48 ft | 49 ft | 50 ft | 51 ft | 52 ft | 53 ft | 54 ft | 55 ft | 56 ft | 57 ft | 58 ft | 59 ft | 60 ft | 61 ft | 62 ft | 63 ft | 64 ft | 65 ft | 66 ft | 67 ft | 68 ft | 69 ft | 70 ft | 71 ft | 72 ft | 73 ft | 74 ft | 75 ft | 76 ft | 77 ft | 78 ft | 79 ft | 80 ft | 81 ft | 82 ft | 83 ft | 84 ft | 85 ft | 86 ft | 87 ft | 88 ft | 89 ft | 90 ft | 91 ft | 92 ft | 93 ft | 94 ft | 95 ft | 96 ft | 97 ft | 98 ft | 99 ft | 100 ft |
earth radius | 4.7841783079579 × 10-8R⊕ | 9.5683566159159 × 10-8R⊕ | 1.4352534923874 × 10-7R⊕ | 1.9136713231832 × 10-7R⊕ | 2.392089153979 × 10-7R⊕ | 2.8705069847748 × 10-7R⊕ | 3.3489248155706 × 10-7R⊕ | 3.8273426463663 × 10-7R⊕ | 4.3057604771621 × 10-7R⊕ | 4.7841783079579 × 10-7R⊕ | 5.2625961387537 × 10-7R⊕ | 5.7410139695495 × 10-7R⊕ | 6.2194318003453 × 10-7R⊕ | 6.6978496311411 × 10-7R⊕ | 7.1762674619369 × 10-7R⊕ | 7.6546852927327 × 10-7R⊕ | 8.1331031235285 × 10-7R⊕ | 8.6115209543243 × 10-7R⊕ | 9.0899387851201 × 10-7R⊕ | 9.5683566159159 × 10-7R⊕ | 1.0046774446712 × 10-6R⊕ | 1.0525192277507 × 10-6R⊕ | 1.1003610108303 × 10-6R⊕ | 1.1482027939099 × 10-6R⊕ | 1.1960445769895 × 10-6R⊕ | 1.2438863600691 × 10-6R⊕ | 1.2917281431486 × 10-6R⊕ | 1.3395699262282 × 10-6R⊕ | 1.3874117093078 × 10-6R⊕ | 1.4352534923874 × 10-6R⊕ | 1.483095275467 × 10-6R⊕ | 1.5309370585465 × 10-6R⊕ | 1.5787788416261 × 10-6R⊕ | 1.6266206247057 × 10-6R⊕ | 1.6744624077853 × 10-6R⊕ | 1.7223041908649 × 10-6R⊕ | 1.7701459739444 × 10-6R⊕ | 1.817987757024 × 10-6R⊕ | 1.8658295401036 × 10-6R⊕ | 1.9136713231832 × 10-6R⊕ | 1.9615131062628 × 10-6R⊕ | 2.0093548893423 × 10-6R⊕ | 2.0571966724219 × 10-6R⊕ | 2.1050384555015 × 10-6R⊕ | 2.1528802385811 × 10-6R⊕ | 2.2007220216606 × 10-6R⊕ | 2.2485638047402 × 10-6R⊕ | 2.2964055878198 × 10-6R⊕ | 2.3442473708994 × 10-6R⊕ | 2.392089153979 × 10-6R⊕ | 2.4399309370585 × 10-6R⊕ | 2.4877727201381 × 10-6R⊕ | 2.5356145032177 × 10-6R⊕ | 2.5834562862973 × 10-6R⊕ | 2.6312980693769 × 10-6R⊕ | 2.6791398524564 × 10-6R⊕ | 2.726981635536 × 10-6R⊕ | 2.7748234186156 × 10-6R⊕ | 2.8226652016952 × 10-6R⊕ | 2.8705069847748 × 10-6R⊕ | 2.9183487678543 × 10-6R⊕ | 2.9661905509339 × 10-6R⊕ | 3.0140323340135 × 10-6R⊕ | 3.0618741170931 × 10-6R⊕ | 3.1097159001727 × 10-6R⊕ | 3.1575576832522 × 10-6R⊕ | 3.2053994663318 × 10-6R⊕ | 3.2532412494114 × 10-6R⊕ | 3.301083032491 × 10-6R⊕ | 3.3489248155706 × 10-6R⊕ | 3.3967665986501 × 10-6R⊕ | 3.4446083817297 × 10-6R⊕ | 3.4924501648093 × 10-6R⊕ | 3.5402919478889 × 10-6R⊕ | 3.5881337309685 × 10-6R⊕ | 3.635975514048 × 10-6R⊕ | 3.6838172971276 × 10-6R⊕ | 3.7316590802072 × 10-6R⊕ | 3.7795008632868 × 10-6R⊕ | 3.8273426463663 × 10-6R⊕ | 3.8751844294459 × 10-6R⊕ | 3.9230262125255 × 10-6R⊕ | 3.9708679956051 × 10-6R⊕ | 4.0187097786847 × 10-6R⊕ | 4.0665515617642 × 10-6R⊕ | 4.1143933448438 × 10-6R⊕ | 4.1622351279234 × 10-6R⊕ | 4.210076911003 × 10-6R⊕ | 4.2579186940826 × 10-6R⊕ | 4.3057604771621 × 10-6R⊕ | 4.3536022602417 × 10-6R⊕ | 4.4014440433213 × 10-6R⊕ | 4.4492858264009 × 10-6R⊕ | 4.4971276094805 × 10-6R⊕ | 4.54496939256 × 10-6R⊕ | 4.5928111756396 × 10-6R⊕ | 4.6406529587192 × 10-6R⊕ | 4.6884947417988 × 10-6R⊕ | 4.7363365248784 × 10-6R⊕ | 4.7841783079579 × 10-6R⊕ |
The foot (pl. feet; abbreviation: ft; symbol: ′, the prime symbol) is a unit of length in the imperial and US customary systems of measurement. Since 1959, both units have been defined by international agreement as equivalent to 0.3048 meters exactly. In both systems, the foot comprises 12 inches and three feet compose a yard.
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
foot | ft | ≡ 0.3048 m ≡ 1⁄3 yd ≡ 12 inches | ≡ 0.3048 m | Imperial/US |
feet | earth radius | feet | earth radius |
---|---|---|---|
1 | ≈ 4.7841783079579E-8 | 4 | ≈ 1.9136713231832E-7 |
1.5 | ≈ 7.1762674619369E-8 | 4.5 | ≈ 2.1528802385811E-7 |
2 | ≈ 9.5683566159159E-8 | 5 | ≈ 2.392089153979E-7 |
2.5 | ≈ 1.1960445769895E-7 | 5.5 | ≈ 2.6312980693769E-7 |
3 | ≈ 1.4352534923874E-7 | 6 | ≈ 2.8705069847748E-7 |
Earth radius is the distance from Earth's center to its surface, about 6,371 km (3,959 mi). This length is also used as a unit of distance, especially in astronomy and geology, where it is usually denoted by R⊕.
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
earth radius | R⊕ | ≈ 6,371 km | ≈ 6,371 km | Science - Astronomy (Length) |
earth radius | feet | earth radius | feet |
---|---|---|---|
1 | ≈ 20902230.971129 | 4 | ≈ 83608923.884514 |
1.5 | ≈ 31353346.456693 | 4.5 | ≈ 94060039.370079 |
2 | ≈ 41804461.942257 | 5 | ≈ 104511154.85564 |
2.5 | ≈ 52255577.427822 | 5.5 | ≈ 114962270.34121 |
3 | ≈ 62706692.913386 | 6 | ≈ 125413385.82677 |
feet | earth radius |
---|---|
1 | ≈ 4.7841783079579 × 10-8 |
20,902,230.971129 | ≈ 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 …) |