| inch | 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 |
| millimeter | 25.4 mm | 50.8 mm | 76.2 mm | 101.6 mm | 127 mm | 152.4 mm | 177.8 mm | 203.2 mm | 228.6 mm | 254 mm | 279.4 mm | 304.8 mm | 330.2 mm | 355.6 mm | 381 mm | 406.4 mm | 431.8 mm | 457.2 mm | 482.6 mm | 508 mm | 533.4 mm | 558.8 mm | 584.2 mm | 609.6 mm | 635 mm | 660.4 mm | 685.8 mm | 711.2 mm | 736.6 mm | 762 mm | 787.4 mm | 812.8 mm | 838.2 mm | 863.6 mm | 889 mm | 914.4 mm | 939.8 mm | 965.2 mm | 990.6 mm | 1 016 mm | 1,041.4 mm | 1,066.8 mm | 1,092.2 mm | 1,117.6 mm | 1 143 mm | 1,168.4 mm | 1,193.8 mm | 1,219.2 mm | 1,244.6 mm | 1 270 mm | 1,295.4 mm | 1,320.8 mm | 1,346.2 mm | 1,371.6 mm | 1 397 mm | 1,422.4 mm | 1,447.8 mm | 1,473.2 mm | 1,498.6 mm | 1 524 mm | 1,549.4 mm | 1,574.8 mm | 1,600.2 mm | 1,625.6 mm | 1 651 mm | 1,676.4 mm | 1,701.8 mm | 1,727.2 mm | 1,752.6 mm | 1 778 mm | 1,803.4 mm | 1,828.8 mm | 1,854.2 mm | 1,879.6 mm | 1 905 mm | 1,930.4 mm | 1,955.8 mm | 1,981.2 mm | 2,006.6 mm | 2 032 mm | 2,057.4 mm | 2,082.8 mm | 2,108.2 mm | 2,133.6 mm | 2 159 mm | 2,184.4 mm | 2,209.8 mm | 2,235.2 mm | 2,260.6 mm | 2 286 mm | 2,311.4 mm | 2,336.8 mm | 2,362.2 mm | 2,387.6 mm | 2 413 mm | 2,438.4 mm | 2,463.8 mm | 2,489.2 mm | 2,514.6 mm | 2 540 mm |
The inch (abbreviation: in or ″) is a unit of length in the (British) imperial and United States customary systems of measurement now formally equal to 1⁄36 yard but usually understood as 1⁄12 of a foot. Derived from the Roman uncia ("twelfth"), inch is also sometimes used to translate related units in other measurement systems, usually understood as deriving from the width of the human thumb.
| 1 inches ≡ 25.4 millimeters | 4 inches ≡ 101.6 millimeters |
| 1.5 inches ≡ 38.1 millimeters | 4.5 inches ≡ 114.3 millimeters |
| 2 inches ≡ 50.8 millimeters | 5 inches ≡ 127 millimeters |
| 2.5 inches ≡ 63.5 millimeters | 5.5 inches ≡ 139.7 millimeters |
| 3 inches ≡ 76.2 millimeters | 6 inches ≡ 152.4 millimeters |
The millimetre (International spelling as used by the International Bureau of Weights and Measures; SI unit symbol mm) or millimeter (American spelling) is a unit of length in the metric system, equal to one thousandth of a metre, which is the SI base unit of length. Therefore there are thousand millimetres in a metre. There are ten millimetres in a centimetre.
| 1 millimeters ≡ 0.039370078740157 inches | 4 millimeters ≡ 0.15748031496063 inches |
| 1.5 millimeters ≡ 0.059055118110236 inches | 4.5 millimeters ≡ 0.17716535433071 inches |
| 2 millimeters ≡ 0.078740157480315 inches | 5 millimeters ≡ 0.19685039370079 inches |
| 2.5 millimeters ≡ 0.098425196850394 inches | 5.5 millimeters ≡ 0.21653543307087 inches |
| 3 millimeters ≡ 0.11811023622047 inches | 6 millimeters ≡ 0.23622047244094 inches |
| 1 inches ≡ 25.4 millimeters |
| 1 millimeters ≡ 0.0393701 inches |