| tum | 1 in | 2 in | 3 in | 4 in | 5 in | 6 in | 7 in | 8 in | 9 in | 10 in | 11 in | 12 in | 13 in | 14 in | 15 in | 16 in | 17 in | 18 in | 19 in | 20 in | 21 in | 22 in | 23 in | 24 in | 25 in | 26 in | 27 in | 28 in | 29 in | 30 in | 31 in | 32 in | 33 in | 34 in | 35 in | 36 in | 37 in | 38 in | 39 in | 40 in | 41 in | 42 in | 43 in | 44 in | 45 in | 46 in | 47 in | 48 in | 49 in | 50 in | 51 in | 52 in | 53 in | 54 in | 55 in | 56 in | 57 in | 58 in | 59 in | 60 in | 61 in | 62 in | 63 in | 64 in | 65 in | 66 in | 67 in | 68 in | 69 in | 70 in | 71 in | 72 in | 73 in | 74 in | 75 in | 76 in | 77 in | 78 in | 79 in | 80 in | 81 in | 82 in | 83 in | 84 in | 85 in | 86 in | 87 in | 88 in | 89 in | 90 in | 91 in | 92 in | 93 in | 94 in | 95 in | 96 in | 97 in | 98 in | 99 in | 100 in |
| centimeter | 2.54 cm | 5.08 cm | 7.62 cm | 10.16 cm | 12.7 cm | 15.24 cm | 17.78 cm | 20.32 cm | 22.86 cm | 25.4 cm | 27.94 cm | 30.48 cm | 33.02 cm | 35.56 cm | 38.1 cm | 40.64 cm | 43.18 cm | 45.72 cm | 48.26 cm | 50.8 cm | 53.34 cm | 55.88 cm | 58.42 cm | 60.96 cm | 63.5 cm | 66.04 cm | 68.58 cm | 71.12 cm | 73.66 cm | 76.2 cm | 78.74 cm | 81.28 cm | 83.82 cm | 86.36 cm | 88.9 cm | 91.44 cm | 93.98 cm | 96.52 cm | 99.06 cm | 101.6 cm | 104.14 cm | 106.68 cm | 109.22 cm | 111.76 cm | 114.3 cm | 116.84 cm | 119.38 cm | 121.92 cm | 124.46 cm | 127 cm | 129.54 cm | 132.08 cm | 134.62 cm | 137.16 cm | 139.7 cm | 142.24 cm | 144.78 cm | 147.32 cm | 149.86 cm | 152.4 cm | 154.94 cm | 157.48 cm | 160.02 cm | 162.56 cm | 165.1 cm | 167.64 cm | 170.18 cm | 172.72 cm | 175.26 cm | 177.8 cm | 180.34 cm | 182.88 cm | 185.42 cm | 187.96 cm | 190.5 cm | 193.04 cm | 195.58 cm | 198.12 cm | 200.66 cm | 203.2 cm | 205.74 cm | 208.28 cm | 210.82 cm | 213.36 cm | 215.9 cm | 218.44 cm | 220.98 cm | 223.52 cm | 226.06 cm | 228.6 cm | 231.14 cm | 233.68 cm | 236.22 cm | 238.76 cm | 241.3 cm | 243.84 cm | 246.38 cm | 248.92 cm | 251.46 cm | 254 cm |
Tum (förkortning: I eller ") är en längdenhet i (Storbritannien) Imperial och USA sedvanliga system för mätning nu formellt lika med 1/36 varvet men vanligtvis förstås som 1/12 av en fot. Avled från den romerska uncia ("tolfte") används ibland även ibland för att översätta relaterade enheter i andra mätsystem, vanligtvis förstås som härledande från den mänskliga tummens bredd.
| 1 tum ≡ 2.54 centimeter | 6 tum ≡ 15.24 centimeter |
| 2 tum ≡ 5.08 centimeter | 7 tum ≡ 17.78 centimeter |
| 3 tum ≡ 7.62 centimeter | 8 tum ≡ 20.32 centimeter |
| 4 tum ≡ 10.16 centimeter | 9 tum ≡ 22.86 centimeter |
| 5 tum ≡ 12.7 centimeter | 10 tum ≡ 25.4 centimeter |
| 1 centimeter ≡ 0.39370078740157 tum | 6 centimeter ≡ 2.3622047244094 tum |
| 2 centimeter ≡ 0.78740157480315 tum | 7 centimeter ≡ 2.755905511811 tum |
| 3 centimeter ≡ 1.1811023622047 tum | 8 centimeter ≡ 3.1496062992126 tum |
| 4 centimeter ≡ 1.5748031496063 tum | 9 centimeter ≡ 3.5433070866142 tum |
| 5 centimeter ≡ 1.9685039370079 tum | 10 centimeter ≡ 3.9370078740157 tum |
| 1 tum ≡ 2.54 centimeter |
| 1 centimeter ≡ 0.3937008 tum |