What is the length of a standard paper clip in millimeters?

• A. 29 mm
• B. 31 mm
• C. 33 mm
• D. 35 mm

Answer: (B)

A standard paper clip is about 31 millimeters long. This size is typical because it’s long enough to grip several sheets without bending too much, yet small enough to sit unobtrusively on a stack of paper. 31 mm corresponds to roughly 1.22 inches, which matches what you’d expect when you pick up a clip from a desk or catalog. Other lengths like 29 mm can be a bit short for holding multiple pages, while 33 or 35 mm would be noticeably larger than the common clip. So 31 mm is the best representative value for a standard paper clip.