20 cm equals 7.87 inches, or about 0.66 feet. That’s just under 8 inches — roughly the length of a dinner fork or a large banana.
If you grew up using inches and feet, centimeters can feel abstract. This guide fixes that. You’ll get the exact conversion, see where 20 cm lands on a real ruler, and find 12 objects you probably already own that match this length almost exactly.
How Long Is 20 cm in Inches, Feet, and Millimeters?
20 centimeters is equal to 7.87 inches. To get this number, divide centimeters by 2.54, since one inch always equals 2.54 cm. This conversion factor comes from the international yard and pound agreement of 1959, which standardized the inch across English-speaking countries.
Here’s the same length across the units Americans use most:
| Unit | Value |
|---|---|
| Millimeters | 200 mm |
| Centimeters | 20 cm |
| Inches | 7.87 in |
| Feet | 0.66 ft |
Most people round this to “about 8 inches” for quick mental math. That small rounding (0.13 inches) rarely matters outside of engineering or medical measurements, where precision counts.
Use our free Centimeter to Feet Converter to instantly convert centimeters into feet with accurate results, making length measurements quick and effortless.
How Long Is 20 cm on a Ruler?
A standard US ruler measures 12 inches, or 30.48 cm. So 20 cm on a ruler doesn’t reach the end — it stops close to the 7⅞-inch mark, leaving about 4 inches of ruler unused.
Picture it this way: if you cover the last four inches of a 12-inch ruler with your thumb, what’s left is almost exactly 20 cm. This visual trick works well for estimating length without doing any math.
For metric rulers (common in science classrooms and imported tools), 20 cm sits at the two-thirds mark on a standard 30 cm ruler — a detail most conversion charts skip but is genuinely useful when you’re staring at an unfamiliar tool.
12 Everyday Objects That Are 20 Centimeters Long
Numbers stick better when you attach them to something real. Below are common items in an American home, kitchen, or backpack that measure close to 20 cm (7.87 inches), described one at a time.
A Large Banana
Bananas sold in US grocery stores typically run 18–22 cm, which puts a large one right at the 20 cm mark. The curve of the fruit can trick your eye into thinking it’s longer than it is, but measured straight from tip to stem, most large bananas land within a centimeter of 20 cm. This makes a banana one of the easiest 20 cm examples to check, since almost every kitchen has one on the counter.
A Dinner Fork
Standard flatware sets, including popular US brands like Oneida and Mikasa, list dinner forks at roughly 19–20 cm from the tip of the tines to the end of the handle. Salad forks and dessert forks run shorter, so it’s specifically the larger dinner-size fork that matches this length. Next time you set the table, lay a fork flat next to a tape measure — it’s a quick, no-cost way to picture the size.
A TV Remote Control
Most universal remotes and cable-box remotes measure 18–22 cm long, making them a familiar, grab-it-and-check reference for how long 20 cm is. Remotes are designed to fit comfortably in one hand while leaving room for a full row of buttons, which naturally puts their length in this range. Since almost every US household owns at least one, it’s one of the fastest mental comparisons you can make without leaving the couch.
A Smartphone With a Case
Many large-screen phones — think 6.7-inch models — measure close to 16–17 cm bare, but once you add a protective case, total length often stretches to near 20 cm. This makes a cased phone a useful, pocket-sized way to picture the measurement, especially since phone dimensions are something most people already know by heart.
A Standard Chef’s Knife Blade
An 8-inch chef’s knife, the single most common size found in US kitchens, measures almost exactly 20 cm along the blade alone, not counting the handle. Culinary schools and professional chefs often recommend this size specifically because it balances control with enough surface area to slice, dice, and chop efficiently. If you own one knife in your kitchen, there’s a good chance it’s this size.
A Hardcover Book’s Short Side
Many US hardcover novels measure close to 20–21 cm across the shorter edge, a standard trim size publishers have used for decades because it fits comfortably in the hand and on a standard shelf. Grabbing any hardcover off a shelf and turning it sideways gives you an almost instant, real-world look at this length.
Three US Dollar Bills, Roughly
A single US bill measures 15.6 cm long, so 20 cm comes out to about one and a quarter bills laid end to end. It’s an unusual comparison, but a memorable one — since paper currency is a fixed, unchanging size, it works as a dependable backup reference when no ruler is around.
A Hairbrush
Standard paddle brushes and many round brushes run 18–20 cm from the base of the handle to the tip of the bristles. Because hairbrushes are designed for a firm one-handed grip, their overall length rarely strays far outside this range across different brands, making them a consistent household comparison.
A Rolling Pin Handle Section
While a full rolling pin is usually much longer, the gripping section — the handle portion on either side of the rolling barrel — often measures close to 20 cm on smaller, French-style rolling pins. Bakers who use these pins daily already have a built-in sense of this length without ever picking up a tape measure.
A Small Tablet’s Width
Compact tablets and e-readers, especially 7 to 8-inch screen models, often measure near 20 cm across their width. This makes a small tablet a modern, easy-to-picture reference point, particularly for anyone who reads or browses on one daily.
A Letter-Size Sheet of Paper, Just Shy
US letter paper measures 21.6 cm across its short side, so 20 cm is just a little less than that — about 1.6 cm short. Since letter-size paper sits in nearly every home printer and office drawer, holding a sheet up and mentally trimming a bit off the edge gives an accurate, instant visual.
A Shoebox’s Short Side
Most standard shoeboxes measure close to 20 cm across the narrow end, regardless of shoe size, since box manufacturers tend to standardize width more than length. If you’ve got an empty shoebox in a closet, it doubles as a surprisingly precise measuring reference.
Must Visit: How Long Is 10 cm? 15 Everyday Objects That Are About 10 Centimeters Long
How to Estimate 20 cm Without a Ruler
You don’t always need a measuring tape. The human body offers surprisingly accurate reference points.
Use your hand span. The average adult hand, from wrist to middle fingertip, measures 18–20 cm. Stretch your hand next to an object — if it matches, you’re looking at roughly 20 cm.
Stack your fingers. Four fingers held together average 7–8 cm wide. Two stacked sets get you close to 20 cm without any tool at all.
Compare to your forearm. From elbow to wrist typically runs 23–25 cm on adults, so 20 cm sits a bit short of that — a useful backup check when your hand isn’t a reliable match.
These tricks won’t replace a tape measure for precise work, but they’re accurate enough for shopping, packing, or quick DIY decisions.
FAQs
How big is a 20 cm example?
A large banana, a standard dinner fork, or an 8-inch chef’s knife blade are all close, everyday examples of 20 cm.
How long is 20 cm on a ruler?
On a 12-inch US ruler, 20 cm reaches close to the 7⅞-inch mark — about four inches short of the ruler’s full length.
What does 20 cm look like?
It looks like an object roughly 8 inches long — think a TV remote, a hairbrush, or a smartphone in a case.
What is 20 cm equal to in inches?
20 cm equals 7.87 inches exactly, calculated by dividing 20 by 2.54.
How much is 20 cm in hand?
About one full adult hand span, measured from the wrist to the tip of the middle finger.
How long is 20 cm in feet?
20 cm equals 0.66 feet, or roughly two-thirds of one foot.
Conclusion
20 cm equals 7.87 inches, or 0.66 feet — just under 8 inches. Whether you’re checking a ruler, sizing up a banana, or measuring with your own hand, this length shows up more often in daily life than you’d expect.
William Ahad is the founder and lead writer at DimensionsDoor, where he researches and publishes verified measurement guides covering doors, furniture, appliances, and everyday objects. With a background in home improvement and product research, William has spent years cross-checking manufacturer specifications, industry standards, and real-world listings to help readers get accurate dimensions before they buy, build, or install anything.
