How many inches in 1 cm?
1 cm = 0.3937007874 in. The other way round: 1 in = 2.54 cm. The centimetre is one hundredth of a metre, the SI base unit of length. Since the 1959 international yard and pound agreement one inch is exactly 2.54 cm. Inches are used worldwide for screen sizes, wheel rims and pipe threads.
Centimeters to inches conversion table
1 cm = 0.3937 in · 2 cm = 0.7874 in · 3 cm = 1.1811 in · 4 cm = 1.5748 in · 5 cm = 1.9685 in · 6 cm = 2.3622 in · 7 cm = 2.7559 in · 8 cm = 3.1496 in · 9 cm = 3.5433 in · 10 cm = 3.937 in · 12 cm = 4.7244 in · 15 cm = 5.9055 in · 20 cm = 7.874 in · 25 cm = 9.8425 in · 30 cm = 11.811 in · 40 cm = 15.748 in · 50 cm = 19.685 in · 75 cm = 29.5276 in · 100 cm = 39.3701 in · 1,000 cm = 393.7008 in
How to convert centimeters to inches
Divide the value by 2.54. Example: 37 cm = 14.5669 in.
Unit Converter
How to use
- 1Pick a category — length, weight, temperature, volume, area, speed, data, time, pressure or energy.
- 2Choose the “from” and “to” units, or press swap to reverse them.
- 3Type a value in either field — the other side updates as you type.
- 4Adjust the decimal precision and check the conversion table for common values.
Exact conversion factors
Many imperial units are defined exactly in metric terms: 1 inch = 2.54 cm, 1 foot = 0.3048 m, 1 mile = 1.609344 km, 1 pound = 0.45359237 kg and 1 US gallon = 3.785411784 litres. The converter uses these definitions, so results are as precise as the decimals you choose to show. The formula is displayed in words — for example “multiply by 2.54” — so you can repeat the calculation by hand.
Temperature is different
Celsius, Fahrenheit and Kelvin do not share a zero point, so temperature cannot be converted with a single factor. °F = °C × 9/5 + 32 and °C = (°F − 32) × 5/9; Kelvin is Celsius + 273.15. That is why 0 °C is 32 °F, while a 10-degree change in Celsius is an 18-degree change in Fahrenheit.
US vs UK units and data sizes
A US gallon (3.785 L) is smaller than an imperial UK gallon (4.546 L), and US fluid ounces differ slightly from UK ones — check which system your recipe or spec uses. For data sizes, storage makers use decimal units (1 GB = 1,000 MB), while operating systems often count in binary units (1 GiB = 1,024 MiB), which is why a new drive shows less capacity than the label.
Frequently asked questions
How many centimetres are in an inch?
Exactly 2.54 cm. To convert cm to inches, divide by 2.54.
How do I convert kg to pounds?
Multiply kilograms by about 2.20462. One pound is exactly 0.45359237 kg.
How do I convert Celsius to Fahrenheit?
Multiply by 9/5 and add 32. For example, 20 °C × 1.8 + 32 = 68 °F.
Can I convert in both directions?
Yes. Type in either field and the other updates, or press swap to switch the units.
Not happy with the results?
Talk to Webin Agency about fast, SEO-friendly websites, e-commerce and Google Ads management.