30.48
cm
304.8
mm
0.3048
m
30.48
cm
304.8
mm
0.3048
m
The Inches to Centimeters Converter converts inches to centimeters using the exact factor 1 inch = 2.54 cm. This is one of the most frequently used conversions worldwide, essential for screen sizes, product dimensions, body measurements, and international shipping specifications.
The inch-centimeter conversion is precise because it is based on an exact international definition: since 1959, one inch has been defined as exactly 25.4 millimeters (2.54 centimeters). This makes the conversion mathematically exact — no rounding errors.
Common uses include converting TV and monitor sizes (measured diagonally in inches), clothing measurements, paper sizes, and hardware specifications. Our converter also provides millimeters for precision engineering applications.
The formula is simple and exact: centimeters = inches × 2.54. For millimeters: mm = inches × 25.4. Since 1 inch = 25.4 mm by international agreement, these conversions introduce zero rounding error.
Common conversions: 1 in = 2.54 cm, 12 in (1 ft) = 30.48 cm, 36 in (1 yd) = 91.44 cm. A standard sheet of US Letter paper is 8.5 × 11 inches (21.59 × 27.94 cm).
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27-inch monitor = 68.58 cm
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1 foot ruler = 30.48 cm
Exactly 2.54 centimeters. This is an exact international definition, not an approximation.
Multiply by 2.5 for a quick estimate (within 2% accuracy). For precision, multiply by 2.54.
5 inches = 12.7 cm exactly.
In 1959, six countries agreed to define the international inch as exactly 25.4 mm, establishing a precise metric equivalent.
Multiply the diagonal inches by 2.54. A 55-inch TV has a 139.7 cm diagonal.
Inches are imperial/US customary units, while centimeters are metric (SI). 1 inch = 2.54 cm, or 1 cm ≈ 0.3937 inches.
1 cm = 0.3937 inches (approximately 2/5 of an inch).
10 inches = 25.4 cm exactly.
This conversion is exact. The international inch is defined as precisely 25.4 mm (2.54 cm).
Convert the fraction to decimal first (e.g., 3/8 = 0.375), then multiply by 2.54. So 3/8 inch = 0.9525 cm.
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