How to Convert 12mm to Inches
12 mm ÷ 25.4 = 0.4724 inches. To find the nearest 32nd, multiply by 32: 0.4724 × 32 = 15.12, which rounds to 15/32.
On a Tape Measure
Standard US tape measures show marks at every 1/16 inch. The nearest mark to 12mm is the 1/2″ mark. For rough layout work, use the 1/2″ mark.