Last updated: March 28, 2026

Convert Inches to Centimeters — Free Calculator

How to Convert Inches to Centimeters

The formula for converting inches to centimeters is straightforward: multiply the number of inches by 2.54 to get the equivalent length in centimeters. This conversion factor is not an approximation or a rounded value. By international agreement established in 1959, one inch is defined as exactly 25.4 millimeters, which means one inch equals exactly 2.54 centimeters. This definition is used worldwide and ensures that every inches-to-centimeters conversion is precise.

To apply the formula, simply take your measurement in inches and multiply by 2.54. For example, if you are 5 feet 5 inches tall, first convert your full height to inches: 5 × 12 + 5 = 65 inches. Then multiply by the conversion factor: 65 × 2.54 = 165.1 cm. Because the conversion factor is exact, there is no rounding error introduced in the calculation itself — the only rounding comes from whatever precision your original measurement has.

Inches to Centimeters Reference Table

Inches	Centimeters
0.25	0.635
0.5	1.27
1	2.54
2	5.08
3	7.62
4	10.16
5	12.7
6	15.24
8	20.32
10	25.4
12 (1 foot)	30.48
24 (2 feet)	60.96
36 (3 feet / 1 yard)	91.44
48	121.92
60 (5 feet)	152.4
65	165.1
70	177.8
72 (6 feet)	182.88
84	213.36
100	254

Common Uses for Inches to Centimeters

The inches-to-centimeters conversion comes up constantly in everyday life, especially when working across imperial and metric systems. Here are some of the most common situations where you will need this conversion:

• Screen sizes: Monitors, televisions, and smartphones are measured diagonally in inches across much of the world. A 27-inch monitor has a diagonal of 68.58 cm, and knowing the metric equivalent is useful when comparing products or planning desk space.
• Height conversion: In the United States, height is given in feet and inches, while most other countries use centimeters. For example, a person who is 5'10" is 70 inches tall, which converts to 177.8 cm.
• Construction and DIY: Lumber, hardware, and building materials are often sold in imperial sizes. Converting to centimeters helps when working with metric plans, tools, or building codes used in many countries.
• Clothing sizes: Inseam lengths, collar sizes, and waist measurements may be listed in inches on some garments and centimeters on others. Accurate conversion ensures a proper fit when ordering internationally.
• Paper sizes: US letter paper is 8.5 × 11 inches (21.59 × 27.94 cm), while most of the world uses A4 at 21 × 29.7 cm. Understanding both dimensions matters for printing and document formatting.

Why Use freeunitconvert.app?

Our converter uses the exact conversion factor of 2.54 centimeters per inch — not a rounded or truncated value. The calculation runs entirely in your browser, which means it works offline once loaded and produces results instantly with no server round-trip. There are no advertisements to slow down the page, and your dark-mode preference is saved locally so the tool remembers your settings every time you return.

Frequently Asked Questions

How many centimeters are in an inch?

Exactly 2.54 cm. This is an exact definition, not an approximation.

How do I convert feet and inches to centimeters?

First convert feet to inches (multiply by 12), add remaining inches, then multiply total by 2.54. For example, 5 feet 8 inches = (5 × 12) + 8 = 68 inches, and 68 × 2.54 = 172.72 cm.

What is 6 feet in centimeters?

6 feet = 72 inches = 182.88 cm.

Is the inch-to-cm conversion exact?

Yes. Since 1959, one inch is defined as exactly 25.4 millimeters (2.54 centimeters).

Can I convert cm back to inches?

Yes, divide centimeters by 2.54, or use freeunitconvert.app's converter with the swap button.