Step-by-step conversion explanation: To convert 68 millimeter to inch, multiply 68 by the conversion factor 0.039370. 68 multiplied by 0.039370 equals 2.67716 inch. For practical purposes, this is commonly rounded to 2.6772 inch.

68 millimeter equals exactly 2.67716535433 inch. For most practical applications, 2.6772 inch is sufficient.

Objects measuring approximately 68 millimeter include a standard tennis ball (diameter 65.4mm to 68.6mm), the base diameter of a Contigo Autoseal West Loop Travel Mug (approx 68mm), and a 68mm bi-metal hole saw.

Converting millimeter to inch is useful for international collaboration in manufacturing, when working with designs or machinery that use imperial units, and for understanding specifications in regions like the United States that still widely use inches for everyday measurements.

A quick mental shortcut is to remember that 1 inch is approximately 25.4 millimeters. So, for 68mm, you can roughly divide 68 by 25, which gives you about 2.7 inches. Visualizing a standard tennis ball or the base of a travel mug can also provide a good visual reference for 68mm.