5.7 inches equals 14.48 centimeters, 144.78 millimeters, or just under half a foot.

It’s a surprisingly common measurement. You’ll find it in your kitchen drawer, your desk, your eyeglass case, and even inside a car engine. Here are 9 real objects that measure exactly — or very close to — 5.7 inches long.

Quick Unit Conversion for 5.7 Inches

Before diving in, here’s a fast reference table:

5.7 inches sits just under the halfway point of a standard 12-inch ruler.

9 Common Things That Are 5.7 Inches Long

Eyeglasses Temple Arms

The temple arms on most adult eyeglass frames measure between 5.5 and 5.7 inches from hinge to tip.

This measurement is standardized across the eyewear industry. When opticians refer to frame temple length, they’re measuring from the hinge pin to the curved tip that hooks behind your ear.

A 140mm temple — the most common adult size — converts to exactly 5.51 inches, while a 145mm temple hits 5.70 inches precisely.

Index Card Diagonal

A standard 3×5 inch index card has a diagonal of √(9+25) = √34 ≈ 5.83 inches — extremely close to 5.7 inches.

Index cards are one of the most overlooked measurement reference tools in any desk drawer. Students, researchers, and note-takers use them daily without realizing they’re holding a near-perfect 5.7-inch visual guide.

The diagonal of a 3×5 index card gives you an instant, ruler-free reference for estimating this length on any flat surface.

Google Pixel 4a Screen

The Google Pixel 4a features a 5.81-inch OLED display — one of the closest real-world phone screens to the 5.7-inch mark.

Google’s Pixel 4a was built around a compact, single-hand-friendly form factor. Its screen diagonal — measured corner to corner — rounds tightly to 5.7 inches when accounting for the display cutout and bezels on the usable viewing area.

If you own a Pixel 4a, your phone screen is your best pocket ruler for estimating this measurement anywhere you go.

Volvo 145mm Connecting Rods

145 millimeters = 5.7086 inches — a near-perfect match.

Volvo’s B-series and D-series engines use 145mm connecting rods, measured center-to-center from the big end bore to the small end bore. These precision-machined components are critical in engine rebuilds, and their 5.7-inch center length is a well-documented spec among auto mechanics and performance builders.

Square 4-Inch Coaster Diagonal

A square coaster with 4-inch sides has a diagonal of √(16+16) = √32 ≈ 5.66 inches — just a hair under 5.7 inches.

Ceramic, cork, and silicone coasters in this size are sold at nearly every home goods store. The 4×4 inch square coaster is one of the most common coaster dimensions in North American kitchens and coffee tables.

Hold one corner to the opposite corner and you’re looking at roughly 5.7 inches — a surprisingly accurate visual tool hiding on your coffee table.

A6 Pocket Notebook Height

The A6 paper format measures 105 × 148mm. That height — 148mm — equals 5.83 inches, placing it just above the 5.7-inch mark.

A6 notebooks are sold by brands like Leuchtturm1917, Moleskine, Rhodia, and Muji. They’re designed for pocket carry, bullet journaling, and travel notes. 

The height of an A6 notebook cover is one of the easiest 5.7-inch size comparisons for anyone who carries a planner.

Standard Gel Ink Pen

Most standard gel ink pens measure between 5.5 and 5.7 inches with the cap on.

The Pilot G2, one of the best-selling pens in North America, measures approximately 5.67 inches capped. The Uni-ball Signo and Zebra Sarasa fall in the same range. These pens are designed to fit comfortably in a shirt pocket — and that pocket-friendly length lands right at the 5.7-inch target.

145mm Radiator Cooling Fan

A 145mm PC or automotive radiator fan has a blade-tip-to-blade-tip diameter of exactly 5.7086 inches.

In PC building, fan sizes are measured in millimeters. 145mm fans appear in niche custom liquid cooling setups and some automotive HVAC blower assemblies. The measurement refers to the outer diameter of the fan frame, not the blade span. It’s a precise engineering figure — not an approximation.

145mm Lab Test Tube

Standard laboratory test tubes at 145mm measure exactly 5.7086 inches from rim to closed bottom.

These are used in chemistry, biology, and clinical lab settings across schools, universities, and research facilities. 

The 145mm × 16mm test tube is a common catalog size from suppliers like Pyrex, Kimax, and Corning. The measurement runs from the open top rim to the rounded closed bottom.

A 145mm test tube is perhaps the most precise everyday object that hits the 5.7-inch mark exactly — no rounding, no approximation.

Quick Everyday Object Reference Table

FAQ’s (Length 5.7 Inches)

How tall is 5.7 in inches? 

5.7 inches is a length measurement equal to 14.48 cm or 144.78 mm. It is not the same as a human height measurement of 5 feet 7 inches.

What does 5.7 inches look like? 

Picture a capped gel pen, a pair of eyeglass temple arms, or the screen of a compact smartphone. Any of those three objects gives you an instant, accurate visual of 5.7 inches.

How much is 5.7 inches?

5.7 inches equals 14.478 centimeters, 144.78 millimeters, and 0.475 feet. It’s a moderate, mid-range length that appears in both everyday objects and precision engineering parts.

How long is 5.7 inches on a ruler? 

On a standard 12-inch ruler, 5.7 inches falls just past the 5¾ mark — between the 5-inch and 6-inch lines, closer to the 6.

Conclusion

5.7 inches shows up more often than most people realize — in your eyeglass frames, your pen, your phone, a lab test tube, and even a car engine.

The nine objects in this guide cover everyday life, precision engineering, and science. 

Next time you need to estimate 5.7 inches, just reach for the gel pen on your desk or the glasses on your face — you already have a ruler right there.