A standard classic Oreo cookie measures approximately 1.75 inches (4.445 cm) in diameter. Its thickness, including the cream filling, is about 0.314 inches (0.798 cm), though this can vary slightly depending on the type of filling, such as Double Stuf or Mega Stuf versions

. There are variations in Oreo sizes, such as:

• Oreo Thins: These are thinner and slightly wider, measuring about 1.875 inches (1 7/8 inches) in diameter and 5 millimeters thick, compared to the original's 1.75 inches diameter and 9 millimeters thickness

• Oreo Big Stuf: An oversized version sold in the 1980s, about 3 inches in diameter, roughly the size of a hockey puck

• Ginormous Oreo Cookie Wafers: These cookie wafers are about 3 inches in diameter but contain no cream filling

In summary, the classic Oreo is about 1.75 inches wide and 0.314 inches thick, with various special editions ranging from thinner versions to larger oversized cookies.