Inches to Centimeters Converter
Convert between inches, centimeters, millimeters, and meters with fractions support. Enter values for instant results with step-by-step formulas.
Reviewed for accuracy by Manoj Kumar, Mathematics Educator
Inches to Centimeters Converter
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Formula: cm = in x 2.54 | in = cm / 2.54 | 1 ft = 12 in | 1 yd = 3 ft
Worked example — 55 in = 139.7 cm = 4 ft 7 in = 1.397 m
Formula
cm = in x 2.54 | in = cm / 2.54 | 1 ft = 12 in | 1 yd = 3 ft
All length conversions use millimeters as the base unit. One inch is exactly 25.4 mm (2.54 cm) by international agreement since 1959. One foot is 12 inches (304.8 mm), and one yard is 3 feet (914.4 mm). Metric units scale by powers of 10: 1 m = 100 cm = 1000 mm.
Worked Examples
Example 1: TV Screen Size
Problem:Convert a 55-inch TV diagonal to centimeters.
Solution:cm = inches x 2.54 cm = 55 x 2.54 = 139.7 cm Also: 55 in = 4 ft 7 in = 1.397 m
Result:55 in = 139.7 cm = 4 ft 7 in = 1.397 m
Example 2: Height Conversion
Problem:Convert a height of 175 cm to feet and inches.
Solution:Inches = 175 / 2.54 = 68.8976 in Feet = 68.8976 / 12 = 5 ft remainder 8.8976 in Fractional: 5 ft 8 7/8 in Meters: 1.75 m
Result:175 cm = 68.9 in = 5 ft 8 7/8 in
Frequently Asked Questions
How do I convert inches to centimeters?
To convert inches to centimeters, multiply the length in inches by 2.54. This is an exact conversion factor — 1 inch is defined as exactly 2.54 centimeters. For example, 12 inches = 12 x 2.54 = 30.48 cm. For a quick mental estimate, multiply inches by 2.5. So 8 inches is approximately 8 x 2.5 = 20 cm (actual: 20.32 cm). This conversion is commonly used in construction, tailoring, and international product specifications.
What are fractional inches and how are they used?
Fractional inches express measurements as fractions (1/2, 1/4, 1/8, 1/16, 1/32, 1/64) rather than decimals. They're standard in US construction, woodworking, plumbing, and hardware. A tape measure is typically marked in 1/16" increments. To convert decimal inches to fractions: multiply the decimal by 16, round to the nearest whole number, and express as that number over 16, then simplify. For example, 0.375" = 0.375 x 16 = 6/16 = 3/8". This converter shows the nearest 1/16" fraction.
How do I convert between feet and meters?
1 foot equals exactly 0.3048 meters (or 30.48 cm). To convert feet to meters, multiply by 0.3048. To convert meters to feet, multiply by 3.2808. For example, 6 feet = 6 x 0.3048 = 1.8288 meters. A useful approximation: 1 meter is about 3 feet 3 inches. For height: 5'10" (70 inches) = 1.778 m. Feet and meters are the most commonly cross-referenced length units in international construction, aviation, and athletics.
Why is an inch exactly 2.54 centimeters?
In 1959, the international yard was officially defined as exactly 0.9144 meters by agreement among six English-speaking nations (US, UK, Canada, Australia, New Zealand, and South Africa). Since 1 yard = 36 inches and 1 yard = 0.9144 m, this makes 1 inch = 0.9144/36 = 0.0254 meters = 2.54 centimeters exactly. Before this standardization, the inch varied slightly between countries. This definition ties the imperial/US customary system directly to the metric system.
References
Reviewed for accuracy by Manoj Kumar, Mathematics Educator · Editorial policy
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