Inches to cm Converter
Convert inches to centimeters, millimeters and meters in one step.
How to use this inches to cm
- 1Enter your measurement in inches — for fractional inches like 6.5", enter 6.5.
- 2The converter instantly shows centimeters, millimeters, and meters.
- 3For height: first multiply feet by 12 and add remaining inches, then enter that total. Example: 5'9" = (5×12)+9 = 69 inches.
- 4For clothing sizes, use the centimeter result to find European sizing equivalents on international retailer charts.
- 5For technical drawings and hardware, the millimeter output is useful since engineering outside the US works in mm.
- 6Remember: 1 inch = 25.4 mm exactly — a useful benchmark for hardware and engineering contexts.
How it's calculated
cm = inches × 2.54. mm = cm × 10. 1 inch = 2.54 cm exactly.
About the Inches to cm
Multiplying by 2.54 is the complete formula for converting inches to centimeters — it's exact by international definition and requires no approximation. The inch has been defined as exactly 2.54 centimeters since 1959, when the US, UK, Australia, and Canada agreed to standardize the definition to eliminate the small discrepancies that had existed between national inch standards.
The most common use of this converter is height. Anyone who moves between countries that use different unit systems for height — or who shops internationally for clothing — routinely needs to convert between the two formats. A 5-foot-9-inch American visiting Europe would typically need to know their height in centimeters (175.26 cm) for medical forms, clothing sizes, and health apps. The conversion requires a two-step process: convert the feet-and-inches format to total decimal inches first (feet × 12 + remaining inches), then multiply by 2.54.
Fashion and clothing sizes represent the other major driver of inch-to-centimeter conversions. In the US, clothing measurements (waist, chest, hips, inseam, collar) are expressed in inches. European, Asian, and international sizing systems use centimeters. A 32-inch waist = 81.28 cm; a 42-inch chest = 106.68 cm; a 30-inch inseam = 76.2 cm. Online shopping across borders has made this conversion a regular need for millions of consumers who buy from international retailers or compare sizing charts across different markets.
For engineering and manufacturing, the inch-to-millimeter conversion (1 inch = 25.4 mm exactly) is particularly important. Many hardware specifications, pipe dimensions, screw thread sizes, and tooling measurements are expressed in inches in the US, while the same categories use millimeters internationally. A 1/4-inch bolt = 6.35 mm; a 3/8-inch bolt = 9.525 mm; a 1/2-inch pipe = 12.7 mm outside dimension. Technical drawings and CAD files sometimes mix both systems, making precise conversion essential for manufacturing accuracy.
Typography and digital design also use inches frequently — print design specifies page margins in inches in the US, while screen design uses pixels. A 1-inch margin = 2.54 cm = 25.4 mm = 96 pixels (at standard 96 DPI screen resolution). Understanding conversions across measurement systems is a practical skill for anyone working across different design contexts or with international clients.
Frequently asked questions
How many centimeters is 1 inch?
Exactly 2.54 centimeters. This is a legally defined exact value, not an approximation, established internationally in 1959.
How many cm is 5 feet 11 inches?
5 ft 11 in = 71 total inches × 2.54 = 180.34 cm. Common heights: 5'6" = 167.64 cm, 5'10" = 177.8 cm, 6'0" = 182.88 cm, 6'2" = 187.96 cm.
How do I convert a fractional inch measurement to centimeters?
Convert the fraction to decimal first: 3/8 inch = 0.375, 1/2 inch = 0.5, 3/4 inch = 0.75. Then multiply by 2.54. Example: 12 and 3/4 inches = 12.75 × 2.54 = 32.385 cm. Or enter 12.75 directly into this calculator.
What is 72 inches in cm?
72 inches × 2.54 = 182.88 cm. This is exactly 6 feet, which is 182.88 cm — one of the most commonly looked-up height conversions.
How many inches is a standard A4 paper in centimeters?
A4 paper is 21 × 29.7 cm, which converts to approximately 8.27 × 11.69 inches. US Letter paper is 8.5 × 11 inches (21.59 × 27.94 cm) — slightly wider and shorter than A4.