Inch to CM Converter
Convert inches to centimeters instantly for measuring, shopping, planning and size comparisons.
Last updated: June 2026
Enter a value to see the conversion instantly.
Why convert inches to centimeters
Inches still appear on screens, accessories, plans and imported product listings, while many measuring tools and room dimensions are handled in centimeters. This page translates the number cleanly so you can compare it with metric tools or local specifications. For this example, 1 inch equals 2.54 centimeters.
The formula is centimeters = inches × 2.54. The mistake usually is not the arithmetic. The mistake is forgetting which unit the source used in the first place. Convert once, then keep the rest of the task in centimeters if that is what your tape, ruler or spec sheet uses.
Typical use cases
- Checking monitor, TV and tablet sizes against available desk or wall space
- Comparing imported product listings with local metric dimensions
- Turning imperial workshop notes into centimeter measurements
A common buying mistake is assuming a size looks small on paper because the unit is unfamiliar. A quick inch-to-centimeter check makes the physical scale easier to judge before you order or cut anything.
Screen sizes and common inch references
| Inches | Centimeters | Typical use |
|---|---|---|
| 5 | 12.70 | Small tablet screen (diagonal) |
| 10 | 25.40 | Tablet or e-reader (diagonal) |
| 13 | 33.02 | Compact laptop screen |
| 15.6 | 39.62 | Standard laptop (most common size) |
| 24 | 60.96 | Entry-level desktop monitor |
| 27 | 68.58 | Most popular desktop monitor size |
| 32 | 81.28 | Large monitor or small TV |
| 55 | 139.70 | Living room TV (standard) |
US clothing sizes in centimeters
US clothing is labelled by body measurements in inches, while most European brands print centimeters, so a quick inch-to-centimeter step makes the two comparable. The table below converts the waist, chest and inseam measurements you see most often.
| Inches | Centimeters | Typical garment measure |
|---|---|---|
| 30" | 76.2 cm | Waist (small) |
| 32" | 81.3 cm | Waist / short inseam |
| 34" | 86.4 cm | Waist / inseam |
| 36" | 91.4 cm | Waist (large) |
| 40" | 101.6 cm | Chest (medium) |
| 42" | 106.7 cm | Chest (large) |
Frequently Asked Questions
Why do product listings mix inches and centimeters?
US manufacturers list dimensions in inches; European and international products use centimeters. A laptop screen labeled "15.6 inches" is 39.6 cm diagonal, which matters if you're comparing models side-by-side in online shopping. Without conversion, you can't visually judge size across vendor borders, and bulk orders get wrong dimensions without this quick check.
When does rounding make a difference in conversions?
For furniture and room planning, 1 inch = 2.54 cm, so small rounding errors compound. A shelf listed as 36 inches is exactly 91.44 cm, but if you round to 91 cm, you lose 4.4 mm, which costs you on tight fits. For rough estimates it doesn't matter, but for woodworking, shelving, or fitting furniture into specific spaces, use this calculator instead of mental math.
Do all countries use the same centimeters?
Yes. The centimeter is part of the metric system used internationally. But inches are primarily used in the US, UK (partially), and Canada. If you're buying from US retailers but measuring in metric (rest of world), this conversion is essential for every product spec, door width, drawer depth, or screen size.
How do I convert a US waist or chest size to centimeters?
Multiply the inch measurement by 2.54. A 32 inch waist is 81 cm and a 40 inch chest is about 102 cm. US clothing is sized in inches while most European labels use centimeters, so converting the body measurement helps you pick the right size when the two systems are not printed side by side.
Why does my US clothing size not match the European one?
Beyond the inch-to-centimeter conversion, sizing systems differ: a US men's 40 chest is roughly a European size 50, and women's numbering is different again. Converting the raw measurement to centimeters is the reliable step, because a tape measure in centimeters compared against the garment's stated centimeters avoids the mismatched size labels entirely.
What is 27 inches in centimeters?
27 inches equals 68.58 centimeters. That is the most popular desktop monitor size. Because monitors are measured diagonally, the actual width of a 27-inch screen is around 60 to 62 cm and the height around 34 to 35 cm for a standard 16:9 panel. Knowing the diagonal in centimeters gives a better sense of physical size before you commit to a desk layout or cable run.
Why are screen sizes always measured in inches, even in metric countries?
The convention comes from early television sets designed in the United States in the 1950s. The inch became the global standard for screen diagonals before metrication reached consumer electronics. Today every screen is still labelled in inches worldwide, including products sold in countries that use metric for everything else. Converting to centimeters is the practical step for metric users who want a physical sense of the size.
3D printing and workshop dimensions
3D printer specifications mix the two unit systems depending on the manufacturer's target market. A US-facing datasheet for the Ender 3 lists the print bed as 8.66 × 8.66 inches; the European version of the same machine shows 220 × 220 mm (22 × 22 cm). Converting once at the start of a project and staying in millimeters throughout avoids a category of unit-mismatch errors entirely.
Drill bit sizes, nozzle diameters and thread pitches follow the same pattern. A 1/4 inch drill bit is 6.35 mm. A standard 0.4 mm FDM nozzle is 0.0157 inches. US tooling suppliers use fractions of an inch; metric suppliers use millimeters and centimeters. Knowing which system a part was specified in before you order is the step that prevents wrong-size deliveries.