1.375 inches is exactly 3.49 cm, or 0.1146 feet. It’s roughly the diameter of a standard plastic bottle cap, or close to the width of a medium binder clip.
How Long Is 1.375 Inches? Quick Unit Conversion
| Unit | Equivalent (for 1.375 in) |
| Inches (in) | 1.375 in |
| Feet (ft) | 0.1146 ft |
| Yards (yd) | 0.0382 yd |
| Centimeters (cm) | 3.49 cm |
| Millimeters (mm) | 34.93 mm |
| Meters (m) | 0.0349 m |
Quick Reference: Objects That Are 1.375 Inches Long
| Object | Approx. Length | Closeness to 1.375 in | Best Use |
| Plastic Bottle Cap (Diameter) | 1.375 in | 10 / 10 | Kitchen reference |
| Medium Binder Clip (Width) | 1.375 in | 10 / 10 | Office reference |
| Jumbo Paperclip (Length) | 1.3–1.4 in | 9 / 10 | Office reference |
| Wood Screw Head (Diameter) | 1.375 in | 10 / 10 | Hardware reference |
| House Key Shaft (Length) | 1.3–1.4 in | 9 / 10 | Hardware reference |
| Casino Dice (Side Length) | 1.375 in | 10 / 10 | Games reference |
| USB-A Connector (Length) | 1.3–1.4 in | 9 / 10 | Tech reference |
| Short Golf Tee (Length) | 1.3–1.4 in | 8 / 10 | Sports reference |
| Six Stacked Quarters (Height) | 1.375 in | 10 / 10 | DIY reference |
| Adult Thumb Width (At Knuckle) | 1.3–1.4 in | 8 / 10 | Body reference |
| Drawer Pull Screw Spacing | 1.375 in | 9 / 10 | Hardware reference |
| Large Safety Pin (Length) | 1.3–1.4 in | 7 / 10 | Household reference |
| Chess Pawn Base (Diameter) | 1.3–1.4 in | 7 / 10 | Games reference |
| Unsharpened Pencil Eraser (Length) | 1.3–1.4 in | 7 / 10 | Office reference |
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Household and Kitchen Items That Are 1.375 Inches Long
A surprising number of the most common 1.375-inch objects are sitting in your kitchen right now, closer than you’d think.
Plastic Bottle Cap
A standard plastic bottle cap, the kind found on soda and water bottles, measures 1.375 inches across its diameter.
Bottling manufacturers keep this size locked in place so caps fit automated capping machinery without jamming or leaking.
Six Stacked Quarters
Stack six U.S. quarters on top of each other and the total height lands right at 1.375 inches. Each coin measures roughly 0.069 inches thick, according to U.S.
Mint specifications, making this one of the easiest tool-free references around.
Large Safety Pin
A large safety pin, the kind used for heavier fabric or costume repairs, typically measures close to 1.375 inches from clasp to tip.
Smaller sewing pins run shorter, which is why this size stands out in a sewing kit.
Hardware and Tools That Are 1.375 Inches Long
Hardware makers didn’t land on 1.375 inches by accident. This length shows up across fasteners, keys, and tools for very specific engineering reasons.
Wood Screw Head
Many wood screw heads are manufactured with a 1.375-inch diameter.
Woodworkers rely on this exact figure to select the correct countersink bit and drill size before starting a project, avoiding a loose or oversized hole.
House Key Shaft
The shaft of a standard residential key, measured from the bow down to the blade tip, runs close to 1.375 inches.
This has been an industry standard for U.S. key blanks for decades, which is why most house keys feel nearly identical in the hand.
Drawer Pull Screw Spacing
Many cabinet and drawer pulls use a screw spacing of 1.375 inches, a common sizing standard in furniture hardware.
Knowing this spacing in advance saves a trip back to the hardware store when replacing old pulls.
Office, Tech, and Games Items That Are 1.375 Inches Long
Outside the toolbox, 1.375 inches shows up constantly on your desk, in your junk drawer, and even on the gaming table.
Medium Binder Clip
A medium binder clip, the kind sold by Staples and Officemate, measures 1.375 inches across its metal wire frame.
Office supply manufacturers hold tight tolerances here, which is why the clip size stays consistent no matter which brand you buy.
Jumbo Paperclip
A jumbo paperclip runs close to 1.375 inches along its longest outer edge, noticeably bigger than the standard paperclip most people keep at their desk.
USB-A Connector
A standard USB-A connector, including its metal housing, measures close to 1.375 inches in length.
This connector appears on countless devices, meaning most people handle this exact measurement daily without ever thinking about it.
Casino Dice
Regulation casino dice measure exactly 1.375 inches on each side, a size enforced by gaming commissions in Nevada, New Jersey, and other regulated U.S. jurisdictions.
The larger size, compared to standard board-game dice, makes rolls easier for overhead security cameras to track.
Chess Pawn Base
The base diameter of a tournament-standard chess pawn often measures close to 1.375 inches, giving the piece enough weight and stability to stay balanced during play.
Question’s
How long is 1.375 inches in centimeters?
1.375 inches equals 3.49 centimeters.
What everyday object is close to 1.375 inches?
A plastic bottle cap, a medium binder clip, and six stacked quarters all measure very close to 1.375 inches.
Is 1.375 inches the same as 1 3/8 inch?
Yes. 1.375 inches and 1 3/8 inch are the exact same measurement, just written in decimal versus fraction form.
How can I measure 1.375 inches without a ruler?
Stack six U.S. quarters, or use the width of your thumb at the knuckle for a close, tool-free estimate.
Is 1.375 inches bigger than a standard paperclip?
A standard paperclip is shorter, but a jumbo paperclip measures almost exactly 1.375 inches, making the two nearly identical in length.
What is 1.375 inches in millimeters?
1.375 inches equals 34.93 millimeters, since one inch always equals 25.4 mm.
Is 1.375 inches longer than a standard screw head?
Not always — it depends on the screw. Many wood screw heads are manufactured at exactly 1.375 inches, so the two are often the same size.
Why is 1.375 inches used for casino dice?
Gaming commissions require this larger size because it’s easier for overhead security cameras to track clearly during live table games.
Sara Khan is the admin of Suitcases Size. She manages website content, reviews measurement guides, and ensures readers get simple, accurate, and easy-to-understand information about sizes, dimensions, and travel measurements.