1 centimeter = 0.39370079 in
1 cm = 0.393701 in · type math like (12*4)+6.5
Centimeters to inches is the conversion people reach for when a product, garment or body measurement was taken in metric but the buyer thinks in inches. It shows up constantly on international clothing size charts, laptop and monitor spec sheets, and in medical records that list height in centimeters while a form back home asks for feet and inches.
in = cm × 0.3937007874
Reverse: 1 in = 2.54 cm.
Convert a height of 172 cm into inches, then into feet and inches.
Answer: 172 cm = 67.72 inches = 5 ft 7.7 in.
| cm | in |
|---|---|
| ¼ cm | 0.098425197 in |
| ½ cm | 0.19685039 in |
| ¾ cm | 0.29527559 in |
| 1 cm | 0.39370079 in |
| 2 cm | 0.78740157 in |
| 3 cm | 1.1811024 in |
| 4 cm | 1.5748031 in |
| 5 cm | 1.9685039 in |
| 6 cm | 2.3622047 in |
| 7 cm | 2.7559055 in |
| 8 cm | 3.1496063 in |
| 9 cm | 3.5433071 in |
| 10 cm | 3.9370079 in |
| 11 cm | 4.3307087 in |
| 12 cm | 4.7244094 in |
| 13 cm | 5.1181102 in |
| cm | in |
|---|---|
| 14 cm | 5.511811 in |
| 15 cm | 5.9055118 in |
| 16 cm | 6.2992126 in |
| 17 cm | 6.6929134 in |
| 18 cm | 7.0866142 in |
| 19 cm | 7.480315 in |
| 20 cm | 7.8740157 in |
| 25 cm | 9.8425197 in |
| 30 cm | 11.811024 in |
| 40 cm | 15.748031 in |
| 50 cm | 19.685039 in |
| 75 cm | 29.527559 in |
| 100 cm | 39.370079 in |
| 250 cm | 98.425197 in |
| 500 cm | 196.85039 in |
| 1 000 cm | 393.70079 in |
A waist listed as 81 cm is 81 ÷ 2.54 = 31.9 inches, so it fits like a US size 32 rather than a 31.
The common 30 cm ruler measures 11.81 inches, which is why it is slightly shorter than a 12-inch foot ruler.
Many airlines allow cabin bags of 55 × 40 × 20 cm. That converts to 21.65 × 15.75 × 7.87 inches, a little under the 22 × 14 × 9 inch limit used by most US carriers on two sides but over it on width.
2.54 turns inches into centimeters. Going from cm to inches you divide by 2.54 (or multiply by 0.3937). If your answer is bigger than the number you started with, you went the wrong way.
67.7 inches is not 6 ft 7.7 in. Divide by 12 first: 67.7 inches is 5 feet with 7.7 inches left over.
Rounding 0.3937 to 0.4 seems harmless, but on a 250 cm sofa it gives 100 inches instead of 98.4, a 1.6 inch error that matters in a tight doorway.
A centimeter is one hundredth of a meter, the SI base unit of length. Since 1983 the meter has been defined by the distance light travels in a vacuum in 1/299,792,458 of a second, so a centimeter is fixed exactly by that physical constant.
Origin. The centimeter arrived with the French metric system in the 1790s, when revolutionary scientists wanted decimal units that anyone could reproduce. The prefix centi- comes from the Latin centum, one hundred.
Used today. Centimeters are the everyday small unit across Europe, Asia, Latin America and Africa: rulers, school exercises, height on ID cards, clothing measurements, furniture dimensions and rainfall-free weather reports such as snow depth.
An inch is exactly 2.54 centimeters. That value was agreed by the United States, United Kingdom, Canada, Australia, New Zealand and South Africa in the 1959 international yard and pound agreement, which ended small national differences.
Origin. The word inch descends from the Latin uncia, meaning one twelfth, because it was one twelfth of a Roman foot. Medieval English law also defined it as the length of three barleycorns laid end to end.
Used today. Inches remain dominant in the United States for construction, tools and personal height, and are used worldwide for screen diagonals, bicycle wheels, tyre rims, pipe threads and denim waist sizes.
Because the inch is now legally defined from the meter. Since 1959 the international inch has been set at exactly 25.4 mm, so 2.54 cm is a definition rather than a measured value.
Multiply by 4 and divide by 10 for a quick estimate: 50 cm × 0.4 = 20 inches. The true answer is 19.69, so the shortcut runs about 1.6% high.
180 ÷ 2.54 = 70.87 inches, which is 5 feet 10.87 inches, usually rounded to 5 ft 11 in.
Yes. A 27 inch monitor measures 68.58 cm corner to corner across the visible panel, not its width.
Both. Official documents and the NHS record centimeters, but most people still describe their own height in feet and inches.