cm to Inches Conversion: Easy Formula + Examples

Whether you're shopping for furniture online, checking your height, or working on a school project, converting centimeters to inches is something most of us need to do regularly. The metric and imperial systems are both widely used around the world, and knowing how to switch between them quickly can save you a lot of confusion.

In this guide, we'll cover the exact formula, walk through real-life examples, and give you a full reference table so you never need to guess again.

What is a Centimeter?

A centimeter (cm) is a unit of length in the metric system. It is equal to one hundredth of a meter. The metric system is used in most countries around the world, including Australia, Canada, and most of Europe.

Common things measured in centimeters include:

• A person's height (e.g. 170 cm)

• Clothing sizes and waist measurements

• Screen sizes and device dimensions

• Paper sizes like A4 (21 cm × 29.7 cm)

What is an Inch?

An inch is a unit of length in the imperial system, commonly used in the United States, United Kingdom, and a few other countries. One inch is equal to 2.54 centimeters.

Common things measured in inches include:

• TV and monitor screen sizes (e.g. 55 inch TV)

• Height in the US (e.g. 5 feet 11 inches)

• Waist sizes on American clothing labels

• Pipe and construction measurements

The Formula: How to Convert cm to Inches

The conversion formula is straightforward:

inches = centimeters × 0.393701

Or if you prefer to think of it the other way:

1 cm = 0.393701 inches

So to convert any centimeter value to inches, simply multiply it by 0.393701.

Step-by-Step Examples

Example 1: Convert 10 cm to inches 10 × 0.393701 = 3.94 inches

Example 2: Convert 30 cm to inches 30 × 0.393701 = 11.81 inches

Example 3: Convert 50 cm to inches 50 × 0.393701 = 19.69 inches

Example 4: Convert 170 cm to inches 170 × 0.393701 = 66.93 inches (that's 5 feet 6.9 inches tall)

Example 5: Convert 100 cm to inches 100 × 0.393701 = 39.37 inches

Real-Life Uses for cm to Inches Conversion

1. Shopping online internationally Many US-based online stores list dimensions in inches while Australian and European shoppers are used to centimeters. Converting correctly means you won't order a rug or desk that doesn't fit your space.

2. Checking your height In Australia and most of the world height is measured in centimeters, but in the US it's measured in feet and inches. If you're 175 cm tall, that's 68.9 inches or 5 feet 8.9 inches.

3. TV and monitor sizes Screen sizes are almost always listed in inches even outside the US. A 55 inch TV is about 140 cm across diagonally.

4. Clothing and fashion International clothing brands often list measurements in both cm and inches. Knowing the conversion helps you find the right fit whether you're buying from a US, European, or Australian store.

5. DIY and home renovation Building materials, timber, and fixtures are sometimes listed in inches depending on where they were manufactured. If your plans are in centimeters and the materials are in inches, you need to convert accurately.

6. School and university work Science subjects use the metric system but many textbooks, especially American ones, include imperial measurements. Being able to convert quickly is a useful skill.

cm to Inches Reference Table

Frequently Asked Questions

How many inches is 1 cm? 1 centimeter equals 0.393701 inches. This is often rounded to 0.39 inches for quick mental calculations.

How many cm is 1 inch? 1 inch equals exactly 2.54 centimeters. This is a fixed, defined conversion that never changes.

What is 5 feet in cm? 5 feet is 152.4 cm. Each foot equals 30.48 cm, so multiply the number of feet by 30.48.

Is cm bigger than inches? No. An inch is bigger than a centimeter. One inch equals 2.54 cm, so an inch is about two and a half times larger than a centimeter.

How do I convert cm to feet and inches? First divide your cm value by 30.48 to get feet. Then take the decimal part and multiply by 12 to get the remaining inches. For example, 170 cm ÷ 30.48 = 5.577 feet, which is 5 feet and 6.9 inches.

Why do some countries use inches and others use cm? Most of the world uses the metric system which includes centimeters. The United States is one of the few countries that still primarily uses the imperial system with inches. The UK uses a mix of both depending on the context.

Common Mistakes to Avoid

Multiplying instead of dividing (or vice versa) Always remember: to go from cm to inches you multiply by 0.393701. To go from inches to cm you multiply by 2.54. Mixing these up is the most common error.

Rounding too early If you round 0.393701 to 0.4 for convenience, your answer will be slightly off. For casual use this is fine, but for precise measurements like construction or engineering, always use the full conversion factor.

Confusing screen size with physical dimensions A 55 inch TV screen is measured diagonally, not across the width. Keep this in mind when measuring your wall space in centimeters and comparing to TV listings in inches.

Quick Tip

Don't want to do the math manually? Use the free cm to inches converter on Simple Unit Convert for instant accurate results. No sign-up required.