Inches to Centimeters Converter - Instant & Precise
Convert inches to centimeters instantly with our free online tool. Perfect for DIY projects, screen sizes, and international shipping. Instant results, zero hassle.
US Length & Distance ConverterThe quick answer for 1 Inches — type any value below for the exact result
Inches
Centimeters
in to cm Conversion Formula
To convert inches to centimeters, multiply the inch value by 2.54. Since 1959, one inch has been internationally defined as exactly 2.54 centimeters.
Inches and Centimeters Explained
Inches (in)
The inch is a US customary and imperial unit of length equal to exactly 2.54 centimeters — one twelfth of a foot. It is the standard unit for screens, pipes, bolts, lumber, and rainfall in the United States, and it divides naturally into the halves, quarters, and eighths that workshop measurement favors. From phone displays to pizza diameters, the inch is how America sizes the objects of daily life, and international buyers constantly translate it.
Where it is used: Dominant in US retail sizing, machining, plumbing, and display marketing; still common in UK trades alongside metric.
Origin: From the Roman "uncia" (a twelfth part); English kings variously fixed it by barleycorns and thumb widths until the 1959 international agreement set exactly 2.54 cm.
Centimeters (cm)
The centimeter is a metric unit of length equal to one hundredth of a meter — 0.393701 inches, so about 2.54 centimeters fill one inch. It is the standard unit for clothing measurements, medical charts, furniture dimensions, and school rulers across nearly the entire world. Products sold into metric markets must carry centimeter dimensions, and anything measured in inches — screen diagonals, wrench openings, photo prints — gets converted to centimeters at the border.
Where it is used: Everyday measuring unit for body size, tailoring, healthcare, and consumer products in all metric countries.
Origin: Introduced with the French metric system of 1795, from the Latin "centum" (hundred); the SI confirmed the cm symbol in 1960.
Inches to Centimeters Conversion Table
| Inches (in) | Centimeters (cm) |
|---|---|
| 0.25 in | 0.635 cm |
| 0.5 in | 1.27 cm |
| 0.75 in | 1.905 cm |
| 1 in | 2.54 cm |
| 2 in | 5.08 cm |
| 3 in | 7.62 cm |
| 4 in | 10.16 cm |
| 5 in | 12.7 cm |
| 6 in | 15.24 cm |
| 8 in | 20.32 cm |
| 10 in | 25.4 cm |
| 12 in | 30.48 cm |
| 16 in | 40.64 cm |
| 18 in | 45.72 cm |
| 24 in | 60.96 cm |
| 36 in | 91.44 cm |
| 48 in | 121.92 cm |
| 60 in | 152.4 cm |
Centimeters to Inches Conversion Table
| Centimeters (cm) | Inches (in) |
|---|---|
| 1 cm | 0.3937007874 in |
| 2 cm | 0.7874015748 in |
| 5 cm | 1.968503937 in |
| 10 cm | 3.937007874 in |
| 15 cm | 5.905511811 in |
| 20 cm | 7.874015748 in |
| 25 cm | 9.842519685 in |
| 30 cm | 11.811023622 in |
| 40 cm | 15.7480314961 in |
| 50 cm | 19.6850393701 in |
| 60 cm | 23.6220472441 in |
| 100 cm | 39.3700787402 in |
Inches to Centimeters in Everyday Objects
Common real-world examples that make Inches and Centimeters easy to picture at a glance.
| Inches (in) | Centimeters (cm) | |
|---|---|---|
| A US quarter diameter | 0.955 in | 2.4257 cm |
| A credit card width | 3.37 in | 8.5598 cm |
| A dollar bill length | 6.14 in | 15.5956 cm |
| A letter paper long side | 11 in | 27.94 cm |
| A subway footlong sandwich | 12 in | 30.48 cm |
| A bowling pin height | 15 in | 38.1 cm |
When You Need Inches to Centimeters Conversions
Fitting a TV in a European Cabinet
US product pages tout a 65-inch OLED, but the Italian media console lists its bay as 145 cm. Converting 65 in to 165.1 cm rules it out and points you to the 55 in set (139.7 cm) instead.
Ordering Lumber for EU Plans
An American workshop blog calls for 8-inch-wide cedar boards. Your Austrian timber yard sells 20 cm planks — converting 8 in to 20.32 cm shows the metric stock runs a hair narrow but planes down fine.
Reading US Sewing Patterns
A vintage pattern asks for 22-inch zipper tape. Converting 22 in to 55.88 cm means the German notions shop's 60 cm zip gets trimmed to length rather than coming up short.
Buying Wheels and Tires Overseas
Rim diameters stay in inches worldwide, but fitment guides in Europe quote overall tire diameter in centimeters. Converting a 32-inch tire to 81.28 cm checks clearance against the 82 cm wheel arch spec.
Related Length Conversions
How to Use
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1
Enter Your Inch Value
Type your measurement (e.g., 12) to determine the centimeter width of a standard 1x12 lumber board.
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2
See the Result
The tool instantly displays the metric equivalent (12 in = 30.48 cm) for your records.
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3
Copy or Swap
Copy the metric figure for a shipping label or click Swap to convert back to imperial.
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4
Check the Table
Review the conversion table for standard values like 24 in (60.96 cm) often used for desk depths.
Why Use Be Converter?
Real-Time Conversion
Get precise inch to centimeter results instantly as you type — no waiting, no page reloads, just fast data.
Exact Precision
Uses the international standard of exactly 2.54 cm per inch for engineering-grade accuracy.
Quick Reference Chart
Fast lookup for common measurements — from 1/4 inch to 36 inches — perfect for job sites.
One-Click Reverse
Toggle between inches and centimeters instantly — essential when ordering parts from abroad.
100% Free & Unlimited
No registration, no paywalls. Convert as many measurements as you need for work or home.
Completely Private
All calculations happen locally in your browser. Your data is never sent to the cloud.
Frequently Asked Questions
How many centimeters are in 1 inch?
How do I convert inches to cm manually?
What is 6 inches in centimeters?
Why is the inch defined as 2.54 cm exactly?
How do I convert fractional inches to centimeters?
How many centimeters is a 55-inch TV?
How many inches is 100 centimeters?
How do I convert shoe sizes from inches to cm?
About this Inches to Centimeters Tool
This free online tool provides instant length conversions for US users who need to work with metric systems. Whether you are ordering electronic components from overseas, calculating dimensions for a DIY renovation in Chicago, or determining if a new appliance fits your counter space, converting inches to centimeters is essential. The US uses the imperial system while most global trade uses metric, making this converter vital for accuracy in international shipping and engineering projects.
Pro Tips for US to Metric Conversion
The 1959 International Yard and Pound Agreement defined the inch as exactly 2.54 cm. This standard is used by the NIST (National Institute of Standards and Technology).
For a quick estimate, just multiply by 2.5. If you have a 40-inch TV, 40 × 2.5 = 100 cm (actual is 101.6 cm), which is close enough for spatial planning.
Screen diagonals are always listed in inches in the US stores. A 65-inch 4K TV bought in New York will have a diagonal of 165.1 cm.
Common lumber sizes like 'two by four' (2x4) refer to nominal dimensions. The actual size is 1.5" x 3.5", which converts to 3.81 cm x 8.89 cm.
When buying tires, a standard R15 rim means 15 inches, which converts to a 38.1 cm diameter for metric tire sizing charts.