cm to Inches Converter Chart

How to convert cm to inches

One inch is defined as exactly 2.54 centimeters, so to convert any length you simply divide the number of centimeters by 2.54:

• inches = cm ÷ 2.54
• To go the other way: cm = inches × 2.54

For example, 10 cm ÷ 2.54 = 3.937 inches, and a standard A4 sheet at 21 cm wide works out to 8.27 inches. Type any centimeter value above and the inch result, the 0–30 cm progress bar and the chart all update instantly.

cm to inches converter chart

This cm to inches converter chart covers the values people look up most often, from a single centimeter up to a full meter. Bookmark it as a quick reference whenever you need a fast centimeters-to-inches answer without typing:

Why 2.54 is the magic number

Since 1959 the inch has been internationally standardized as exactly 2.54 centimeters, which makes the conversion precise rather than approximate. A handy mental shortcut is that 1 cm is a little under four-tenths of an inch, so you can estimate quickly by multiplying centimeters by 0.4 before reaching for the exact figure.

cm to inches in everyday measurements

• A4 paper is 21 cm wide — that is 8.27 inches, close to (but not the same as) US Letter's 8.5 inches.
• A laptop screen quoted as 33 cm on the diagonal is roughly 13 inches.
• Height is often given in cm outside the US: 170 cm is about 5 ft 7 in (66.9 inches), and 180 cm is about 5 ft 11 in.

Converting cm to feet and inches

Heights and room sizes are often wanted in feet and inches rather than plain inches. Do it in two steps: divide the centimeters by 2.54 to get total inches, then divide that by 12 — the whole number is the feet and the remainder is the inches. For 170 cm: 170 ÷ 2.54 = 66.9 inches; 66.9 ÷ 12 = 5 remainder 6.9, so 170 cm is 5 ft 6.9 in. The same method turns any metric height into the imperial form used on US forms and ID.

Why the inch and centimeter don't line up neatly

There is no tidy round-number link between the two because they grew out of different systems — the inch from imperial units and the centimeter from the metric system. They were only formally reconciled in 1959, when the inch was pinned to exactly 2.54 cm. That fixed definition is what lets this converter be exact rather than approximate, and also why the numbers, though precise, rarely fall on clean round values.

cm to inches for clothing and body measurements

Clothing sizes are one of the most common reasons people convert cm to inches, because size charts often mix the two. A waist listed as 81 cm is 31.9 inches, a 91 cm chest is 35.8 inches, and a 71 cm inseam is 28 inches. Shoe sizing is quoted in cm in much of the world too — a 27 cm foot is about 10.6 inches. When a chart gives one unit and your tape measure reads the other, convert the measurement rather than guessing, since being off by even an inch can change the fit.

cm to inches for screens and TVs

Screen sizes are always quoted as the diagonal, and the two units get mixed constantly. A 55 cm diagonal is about 21.7 inches, a 68.6 cm screen is the familiar 27 inches, and a 139.7 cm TV is a 55-inch set. Because the measurement is a diagonal, converting the number directly with ÷2.54 gives the right answer — you do not need the width and height separately. That is handy when a spec sheet lists the panel in centimetres but retailers advertise it in inches.

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