Conversion
Inches to CM Converter
Convert between inches and centimeters instantly. Supports fractions like "3 1/2" with a complete reference table.
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Enter a value in either field to convert
Reference Table (1–24 inches)
| Inches | CM | Inches | CM |
|---|
How is this calculated?
Inches to CM:
cm = inches × 2.54
CM to Inches:
inches = cm ÷ 2.54
Fraction parsing:
"3 1/2" → 3 + (1÷2) = 3.5 inches
"3.5" → 3.5 inches
Constant: 1 inch = 2.54 cm (exact)FAQ
Frequently asked questions about inches to cm
How many cm is 1 inch?
1 inch equals exactly 2.54 centimeters. This is an exact definition established in 1959 by international agreement. To convert inches to cm, multiply by 2.54.
How do I convert inches to cm?
Multiply the number of inches by 2.54. For example, 12 inches × 2.54 = 30.48 cm. For fractions like 3 1/2 inches: 3.5 × 2.54 = 8.89 cm.
How do I convert cm to inches?
Divide the number of centimeters by 2.54. For example, 10 cm ÷ 2.54 = 3.937 inches. Alternatively, multiply cm by 0.3937.
What is 6 inches in cm?
6 inches equals 15.24 cm. Calculation: 6 × 2.54 = 15.24 cm. This is roughly the width of a standard smartphone.
Why are there two measurement systems?
The imperial system (inches, feet) developed from historical English units, while the metric system (cm, meters) was created during the French Revolution for scientific precision. Most countries use metric; the US primarily uses imperial.
How do I measure in inches without a ruler?
Common references: a US quarter is about 1 inch diameter, an adult thumb width is roughly 1 inch, a credit card is 3.37 inches wide, and a dollar bill is 6.14 inches long.