Article — Centimeter Converter
Centimeter Converter: cm to inches, feet, meters, and more
One centimeter is one hundredth of a meter, equal to 0.3937 inches or 10 millimeters. To convert centimeters to inches, divide by 2.54. To convert centimeters to feet, divide by 30.48. To convert centimeters to meters, divide by 100. The factors are exact, fixed by international agreement. The calculator at the top of this page runs all seven conversions from a single input.
The centimeter is the everyday unit for body height, furniture, paper sizes, and school-level measurements in 95% of countries. The remaining 5% — primarily the United States — uses inches and feet for the same things. The conversion math sits exactly between the metric world and the imperial world, and the calculator above handles either direction.
What is a centimeter?
The centimeter (cm) is a unit of length in the metric system equal to one hundredth of a meter. The prefix "centi" comes from the Latin centum, meaning hundred. The metric system was created in France in 1795 during the Revolution, designed to replace the dozen-or-so regional units of length used across pre-industrial Europe with a single, decimal, rational scale.
The modern meter (and therefore the centimeter) is defined by the speed of light. Since 1983, one meter is the distance light travels in a vacuum in 1/299,792,458 of a second. The centimeter, as 1/100 of that, has the same precise definition. The unit is not based on a physical artifact or a king's foot anymore — it is grounded in a fundamental constant of physics.
The CGS (centimeter-gram-second) system, formalized in 1874, used the centimeter as its base unit of length. Modern SI replaced CGS with the meter as the base unit, but centimeter usage stuck because it's the right size for many everyday measurements — pen lengths, book widths, hand spans, and shoulder breadths all fall in the 10-50 cm range.
Centimeter to inches
Divide centimeters by 2.54 to get inches. The 2.54 factor is exact, fixed by the 1959 International Yard and Pound Agreement. Before the treaty, the US inch and the imperial (British) inch differed by about 2 parts per million — close enough to ignore for daily work but enough to matter in precision manufacturing. Today, 1 inch equals exactly 2.54 cm in every country that uses the inch at all.
cm ÷ 2.54 = inchesin × 2.54 = centimeters1 cm = 0.3937 in10 cm = 3.937 in100 cm = 39.37 in2.54 cm = 1 inFor mental math, cm × 0.4 gives inches with about 1.6% overstatement. The "1 inch ≈ 2.5 cm" rule works for most casual conversions but is wrong for precision work. Use the exact 2.54 factor whenever the result has to match a specification.
Centimeter to feet and inches
Converting centimeters straight to feet-and-inches is a two-step process. First find total inches by dividing cm by 2.54. Then divide that result by 12 for whole feet; the remainder is the leftover inches. Example: 175 cm ÷ 2.54 = 68.90 in; 68.90 / 12 = 5 with 8.90 inches left over. So 175 cm equals 5 feet 8.90 inches, or about 5'9".
- 150 cm = 4 ft 11.06 in (4'11")
- 160 cm = 5 ft 2.99 in (5'3")
- 170 cm = 5 ft 6.93 in (5'7")
- 175 cm = 5 ft 8.90 in (5'9")
- 180 cm = 5 ft 10.87 in (5'11")
- 183 cm = 6 ft 0.05 in (a clean 6 feet)
- 190 cm = 6 ft 2.80 in (6'3")
- 200 cm = 6 ft 6.74 in (6'7")
Centimeter in the metric system: mm, m, km
Within the metric system, all conversions to and from centimeters use powers of 10. There is no irrational factor like 2.54 — just decimal shifts.
One centimeter equals 10 millimeters. One centimeter equals 0.01 meters. One centimeter equals 0.00001 kilometers. Going the other way: 1 mm = 0.1 cm; 1 m = 100 cm; 1 km = 100,000 cm. The unit choice depends on the scale of what you are measuring. Millimeters for screws and drill bits; centimeters for body parts and furniture; meters for rooms and vehicles; kilometers for distances between cities.
Centimeter for body height
Body height is the most-converted centimeter value worldwide. Passports, drivers' licenses, school records, and medical charts in most countries record height in cm. The US records height in feet and inches. Anyone with an international document or who watches sports broadcasts from another country runs the cm-to-feet conversion regularly.
Median adult heights vary by country and ancestry. The Netherlands has the tallest population on record (median male around 184 cm, female around 170 cm). The shortest median heights are in parts of South and Southeast Asia (median male around 162 cm). The average US adult male is about 175 cm (5'9") and female about 162 cm (5'4") — numbers that have crept down slightly in the last two decades as the population has diversified.
Quick mental shortcut for centimeter to feet-inches: subtract 100 from your cm, then halve it for inches above 3 feet. 170 cm → 70 → halve = 35 in → rough 5 ft 7 in (close to the real 5'7"). Works between 160 and 200 cm; off by less than half an inch.
Centimeter in everyday measurements
Centimeters appear on tape measures, school rulers, and most furniture, clothing, and packaging specs in metric countries. A standard ruler is 30 cm long (12 inches in the US). Letter-size paper is 21.6 by 27.9 cm; A4 paper is 21.0 by 29.7 cm. A standard interior door is 200-210 cm tall. A king-size bed is 193 by 203 cm. A hospital gurney is about 190 cm long.
Photo and screen measurements are inconsistent. Print photo sizes (4 by 6 inches, 5 by 7 inches) come from the imperial system but are listed in centimeters on European packaging (10 by 15 cm, 13 by 18 cm). Phone and laptop screen diagonals are in inches universally regardless of country.
Countries that use centimeters
The metric system is the official measurement system in 95% of the world's countries by population. The United States, Liberia, and Myanmar are the only countries that have not officially adopted metric. Even in those three, scientific work, the military, and medical practice use metric internally. Centimeters appear on US food packaging, automotive specifications, and many consumer products in addition to inches.
The United Kingdom is officially metric by law but uses imperial units on road signs (miles, yards) and in pubs (pints). Canada and Australia are formally metric but routinely use feet and inches in informal conversation about body height. The boundaries between systems are blurry; the conversion math is sharp.
Reading 175 cm as 175 mm gives 6.89 inches instead of 68.90 inches — off by a factor of 10. Most measurement errors in metric-to-imperial conversions come from mixing up the metric prefix. Always confirm whether you have mm or cm before applying the 2.54 factor.
Common centimeter-conversion mistakes
The biggest is using the 2.5 cm-per-inch shortcut on precision work. The factor is 1.6% off — fine for everyday use, unacceptable for machining. The second is mixing cm with mm. The third is converting cm to feet without remembering to convert the fractional feet back to inches.
- 1 cm = 0.3937 in (exact)
- 1 cm = 10 mm (exact)
- 1 cm = 0.01 m (exact)
- 30.48 cm = 1 ft (exact)
- 91.44 cm = 1 yd (exact)
- 2.54 cm = 1 in (exact, treaty)
- 175 cm = 5'9" (typical adult height conversion)
- cm × 0.4 ≈ in (mental shortcut, 1.6% off)