To convert 2.9 millimeter to inch, multiply 2.9 by the conversion factor 0.039370. The calculation is 2.9 x 0.039370 = 0.114173 inch.

2.9 millimeter equals exactly 0.114173 inch. For most practical purposes, this is often rounded to 0.1142 inch.

Objects measuring approximately 2.9 millimeter include the diameter of a 3mm through-hole LED, the thickness of a small smartphone camera lens element, or the diameter of a 2.9mm precision drill bit.

Converting millimeter to inch is useful for international engineering collaboration, complying with regional market standards (e.g., in the United States), and integrating components from different manufacturing origins in global supply chains.

Memory aids include visualizing 2.9mm as slightly less than 3mm, which is roughly 0.118 inch. For quick estimation, remember that 1mm is about 0.04 inch, so 2.9mm is approximately 2.9 x 0.04 = 0.116 inch. For precision, always use the exact conversion factor 0.039370.