1.375 Inches 6 Surprising Things That Are This Size
1.375 in inches equals exactly 1 3/8 inches, or 3.4925 centimeters (34.925 millimeters). That’s a little longer than the width of a standard paper clip and just shy of one and a half inches. It sits right between “small” and “medium” on most household rulers.
If you’ve ever stared at a tape measure trying to picture 1.375 in inches, you’re not alone. This measurement shows up more often than people realize in hardware stores, kitchen drawers, and even loose change. 1.375 Inches This guide breaks down the exact conversion, shows a quick reference table, and walks through six real, everyday objects that measure close to 1.375 in inches so you can picture it without pulling out a ruler.
Most conversion pages stop at the math. This one goes further by explaining what 1.375 in inches actually looks like next to things you already own, including a few comparisons like a stack of coins that most competing articles skip entirely.
What Is 1.375 in Inches?
1.375 in inches is a decimal measurement equal to the fraction 1 3/8 inches. In the imperial system, it falls between 1 1/4 inches and 1 1/2 inches, making it a common size for screws, hinges, and small hardware parts. Because it’s a “clean” eighth-inch fraction, 1.375 in inches shows up constantly on rulers, tape measures, and product spec sheets.
Understanding 1.375 in inches also means understanding how it compares to metric measurements. In the U.S., inches remain the default for construction and hardware, but almost every product label also lists the metric equivalent for international buyers. That’s why knowing both sides of the conversion matters, whether you’re shopping online, following a DIY guide, or measuring 1.375 inches for a school or work project.
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On a standard tape measure, 1.375 in inches lands exactly on the third small mark past the 1 3/8-inch line, which is why carpenters and machinists consider it an easy fraction to read at a glance. Unlike odd decimal values such as 1.3 or 1.42, which fall between ruler marks and require rounding, 1.375 in inches lines up cleanly with the eighth-inch increments printed on nearly every U.S. ruler and tape measure. This is one of the smaller details that makes 1.375 in inches a popular size choice for manufacturers, since it’s simple to measure consistently on a factory floor without specialized equipment.
It’s also worth noting how 1.375 in inches compares to other nearby fractional inches people search for. It’s a full eighth of an inch shorter than 1.5 inches, and an eighth of an inch longer than 1.25 inches. That places it squarely in the middle of the most common small-hardware size range, which explains why so many screws, hinges, and clips land on this exact number instead of rounding up or down to a whole or half inch.
Quick Conversion Table
| Unit | Equivalent |
| Inches | 1.375 in |
| Fraction | 1 3/8 in |
| Centimeters | 3.4925 cm |
| Millimeters | 34.925 mm |
| Feet | 0.1146 ft |
| Yards | 0.0382 yd |
Quick Reference Table
| Object | Approx. Measurement | Closeness Score (X/10) | Best Situation/Use |
| No. 1 Paper Clip | 1.375 in | 10/10 | Office supplies, quick visual reference |
| 1 3/8-Inch Door Hinge | 1.375 in | 10/10 | Cabinet and interior door hardware |
| D Battery Diameter | 1.33 in | 8/10 | Flashlights, radios, remote comparisons |
| Stack of 20 U.S. Quarters | 1.38 in | 9/10 | Fun coin-based size comparison |
| Standard Tea Light Candle | 1.375–1.4 in | 8/10 | Candle-making and home décor sizing |
| 1 3/8-Inch Wood Screw | 1.375 in | 10/10 | Furniture assembly, light carpentry |
How Big Is 1.375 in Inches? 6 Everyday Objects Compared
Numbers on a page rarely mean much until you can picture them. Below are six household and hardware items that measure right around 1.375 in inches, chosen because most people have seen or held at least one of them.
The Standard No. 1 Paper Clip
The classic “No. 1” size paper clip, the one found in nearly every U.S. office supply drawer, measures 1 3/8 inches long, matching 1.375 in inches almost exactly. Office supply manufacturers like Officemate and ACCO Brands have used this size as the industry default for decades because it holds 10–15 sheets of standard paper without bending.
This makes the paper clip one of the easiest ways to visualize 1.375 in inches without pulling out a ruler. Next time you see one on your desk, you’re looking at a near-perfect real-world example of exact length of 1.375 inches. It’s also a handy trick for teachers and students who need a quick, no-tools way of estimating 1.375 inch measurement without interrupting a lesson to grab a tape measure.
A 1 3/8-Inch Door Hinge
Cabinet and interior door hinges are commonly sold in a 1 3/8-inch leaf width, a size stocked by major hardware chains like Home Depot and Lowe’s for lightweight doors and cabinetry. This size sits between the smaller 1-inch hinges used on jewelry boxes and the larger 3.5-inch hinges used on exterior doors.
Knowing this helps homeowners avoid buying the wrong hardware size during a renovation. Something no competitor explained: hinge sizing usually refers to the closed leaf width, not the pin length, so a “1 3/8-inch hinge” is measuring the same span as 1.375 in inches, not a different hidden dimension.
A D Battery’s Diameter
A standard D battery, the kind used in large flashlights and boomboxes, has a diameter of about 1.33 inches, according to published Duracell and Energizer spec sheets. That’s just under 1.375 in inches, making it a close but not exact stand-in when you need a quick mental picture.
This comparison is useful because D batteries are common in most households, so reaching for one gives a fast, tactile sense of measuring 1.375 inches even though the match isn’t perfect. Key distinction: unlike the paper clip or hinge, this is an approximation rather than an exact size match.
A Stack of 20 U.S. Quarters
Here’s a comparison most measurement guides skip: a neatly stacked pile of 20 U.S. quarters measures roughly 1.38 inches tall, based on the U.S. Mint’s published quarter thickness of 1.75 millimeters each. That height lands remarkably close to 1.375 in inches.
It’s a fun, hands-on way to visualize the measurement using spare change most people already have in a junk drawer. This kind of visual comparison for 1.375 inches sticks in memory far better than a plain number on a ruler, especially for kids learning fractions or anyone who prefers a hands-on reference over an abstract number.
A Standard Tea Light Candle
Most standard tea light candles, including popular versions sold by IKEA and Yankee Candle, have a diameter of roughly 1.375 to 1.4 inches. This size became an unofficial industry standard because it fits snugly into most glass tea light holders and votive cups sold in the U.S.
For anyone shopping for candle-making supplies or replacement holders, this measurement matters. A tea light that’s noticeably smaller or larger than 1.375 in inches often won’t sit securely in a standard holder, leading to wobbling or uneven burning. Crafters who pour their own candles often keep a small ruler on hand specifically to check mold diameters against this benchmark before a batch sets.
A 1 3/8-Inch Wood Screw
Wood screws sold in the 1 3/8-inch length are a common hardware store staple, used for attaching hinges, light fixtures, and small furniture joints. Brands like Grip-Rite and Hillman Group list this exact length among their standard screw sizes because it’s long enough to bite into most cabinet-grade wood without poking through the other side.
This size example shows how 1.375 in inches isn’t just a random decimal. It’s a practical, everyday measurement baked into construction and furniture standards across the U.S. hardware industry, and it’s a good reminder that fractional inch sizes like this one are chosen deliberately rather than arbitrarily during manufacturing.
How to Measure 1.375 Inches Without a Ruler
Not everyone has a tape measure handy. If you need to estimate 1.375 in inches on the fly, try lining up a standard No. 1 paper clip end to end, since it matches almost exactly. A stack of 20 quarters works nearly as well and is often easier to find in a pocket or car console.
For slightly more precision, most smartphones have a built-in measuring app that uses the camera to estimate short distances. These apps won’t replace a physical ruler for exact work, but they’re accurate enough for quickly checking whether something is close to 1.375 in inches.
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FAQ’s
What is 1.375 inches in centimeters?
1.375 inches equals 3.4925 centimeters. To convert inches to centimeters, multiply the inch value by 2.54, which is the fixed conversion rate between the two units.
What is 1.375 inches in millimeters?
1.375 inches equals 34.925 millimeters. This is found by multiplying the centimeter value (3.4925) by 10, since there are 10 millimeters in every centimeter.
Is 1.375 inches the same as 1 3/8 inches?
Yes, 1.375 inches and 1 3/8 inches are exactly the same length. The fraction 3/8 equals 0.375 as a decimal, so 1.375 in inches and 1 3/8 inches are two ways of writing the identical measurement.
What everyday object is about 1.375 inches?
A standard No. 1 paper clip is one of the closest everyday matches to 1.375 in inches. A 1 3/8-inch door hinge and a stack of 20 U.S. quarters are also close, practical comparisons for visualizing this exact length.
How accurate is 1.375 inches on a tape measure?
Most standard tape measures mark 1.375 inches precisely, since it falls on a clean 1/8-inch line. Because 1.375 in inches divides evenly into eighths, it’s one of the easier fractional measurements to read accurately on standard ruler markings.
How do you measure 1.375 inches without a ruler?
The easiest way is to line up a standard No. 1 paper clip, since its length is nearly identical to 1.375 in inches. A stack of 20 U.S. quarters or a smartphone measuring app can also give a close estimate when a physical ruler isn’t available.
Final Thoughts
1.375 in inches is a short but surprisingly common measurement, showing up in office supplies, hardware, candles, and even stacked coins. Whether you’re comparing it to a paper clip, a door hinge, or a handful of quarters, the goal is the same: turning an abstract number into something you can actually picture.
Next time a project, recipe, or shopping list calls for 1.375 in inches, you’ll have half a dozen real-world references to check it against no ruler required, though keeping one nearby never hurts for precise work.
