cm to Inches Converter
Convert any length from centimeters to inches, feet and meters in one step.
How to use this cm to inches
- 1Enter your measurement in centimeters in the input field.
- 2The converter instantly displays the equivalent in inches, feet, and meters.
- 3For height conversions, the feet result shows total decimal feet — combine with the inches result to get the common ft + in format.
- 4For screen or monitor sizes, the diagonal in inches is what manufacturers advertise — enter the cm diagonal to verify the listed inch size.
- 5For clothing sizes, use the inches result to match US sizing charts (waist, chest, inseam are typically in inches in the US).
- 6Use the formula cm ÷ 2.54 to do the conversion mentally when you need a quick estimate.
How it's calculated
inches = cm ÷ 2.54. feet = inches ÷ 12. 1 inch = 2.54 cm exactly.
About the cm to Inches
The centimeter-to-inch conversion is one of the most frequently needed unit conversions in everyday life, bridging the metric and imperial measurement systems that divide the world into two camps. The conversion factor is exact: 1 inch = 2.54 centimeters precisely, established by international agreement in 1959. This exactness means the conversion between the two systems involves no rounding error at the definition level — any approximation comes only from how many decimal places you choose to display.
The most common use case is height. In the US, height is universally expressed in feet and inches; in most other countries, it's in centimeters. A person who is "5 foot 10" in the US is 177.8 cm in a European medical context. Understanding your height in both systems is increasingly useful in an internationally connected world — apps, medical forms, and international travel routinely switch between them. The conversion is straightforward: convert total height to inches (feet × 12 + remaining inches), then multiply by 2.54.
Screen sizes are another major driver of cm-to-inch searches. Display manufacturers worldwide advertise screen diagonals in inches — a "27-inch monitor" or "65-inch TV" — even in countries that use the metric system. This means centimeter-to-inch conversion is needed when comparing specifications from different markets or when a product is described in centimeters and needs to be matched to familiar inch-based categories. A 68.6 cm TV diagonal is 27 inches; a 139 cm diagonal is 55 inches.
Clothing is the third major use case, with significant complexity. US clothing sizes use inches for waist, chest, inseam, and collar measurements. European sizes use centimeters. A 34-inch waist jeans in the US corresponds to an 86 cm waist in European sizing (34 × 2.54 = 86.36 cm). Online shopping has made international clothing size conversion a daily need for millions of consumers, and getting the conversion right avoids the cost and hassle of returns.
For quick mental estimation, dividing by 2.5 instead of 2.54 gives a result within 1.6% of the accurate answer — close enough for most practical purposes. If more precision is needed, divide by 2.54 exactly. For the reverse (multiplying inches by 2.54 to get centimeters), multiplying by 2.5 and adding 1.6% gives a similarly close estimate.
Frequently asked questions
How many inches is 1 centimeter?
1 centimeter = 0.3937 inches. The reverse is exact by international definition: 1 inch = exactly 2.54 centimeters, adopted in 1959 by the US, UK, Australia, and Canada.
How many inches is 100 cm (1 meter)?
100 cm = 39.3701 inches = 3 feet 3.37 inches. This is a useful benchmark: 1 meter is approximately 3 feet and 3 inches, or just over a yard (which is 36 inches).
How many inches is 5 feet in centimeters?
5 feet = 60 inches × 2.54 = 152.4 cm. Common height conversions: 5'0" = 152.4 cm, 5'6" = 167.6 cm, 6'0" = 182.9 cm, 6'2" = 187.96 cm.
Why does the US still use inches instead of centimeters?
The US is one of three countries (along with Liberia and Myanmar) that hasn't officially switched to the metric system. Despite several legislative attempts since the 1800s, the familiarity of customary units has prevented adoption. Metric units are used in science, medicine, military, and industry — but everyday measurements (height, clothing, construction) remain in imperial units in the US.
What is a quick mental trick for cm to inches?
Divide by 2.5 for a fast approximation — it's within 1.6% of the accurate answer. Example: 50 cm ÷ 2.5 = 20 inches (true answer: 19.69 inches). For even faster estimation, divide by 3 and add 25% (e.g., 60 ÷ 3 = 20, + 25% = 25 — but this is less accurate). The ÷ 2.5 method is more reliable.