The thickness of 16 gauge aluminum plate is approximately 1.29 millimeters (mm).

The term “aluminum gauge” is used to describe the thickness of aluminum sheet or plate. This is a common method of specifying aluminum thickness in various industrial applications, especially in the United States.

In aluminum gauge systems:

The higher the gauge number, the thinner the aluminum sheet or sheets. Therefore, lower gauge numbers correspond to thicker aluminum sheets.

Gauge numbers are often used to describe the thickness of aluminum plate, with common gauges ranging from 8 to 30 and sometimes larger.