A 1:18 scale is standard for many scale models and figures. This scale means that each unit of measurement on the scale model equals 18 units of the same measurement on the original. This scale is also known as the 2/3-inch scale because 2/3 inch represents 1 foot.

Scale models are measured in inches or centimeters. Thus, 1 inch of width or depth on the scale model equals 18 inches of width or depth on the original. Common examples of models sold at this scale include diecast model cars, action figures and dollhouses. A typical car model using this scale is 20 to 30 centimeters, or 8 to 12 inches, long.