Cm to inches converter
Enter a value in either field and get the conversion instantly.
100% private — your files are processed on your device and never uploaded to a server.
How it works
- 1
Pick a field
Type the value in centimeters, or directly in inches — whichever you have.
- 2
Read the conversion
The other field updates automatically, no button required.
- 3
Use the result
Apply it to screen sizes, clothing, furniture or height.
How to convert centimeters to inches
One inch equals exactly 2.54 centimeters — a fixed equivalence set by international agreement in 1959 that never changes. To go from cm to inches, divide the value by 2.54 (for example, 180 cm ÷ 2.54 ≈ 70.87 in). To go the other way, multiply the number of inches by 2.54 (a 55-inch screen measures 55 × 2.54 = 139.7 cm diagonally).
This conversion matters most when shopping for appliances and screens — almost always advertised in inches — when reading imported clothing or shoe sizes, or when working with technical drawings and specs from the US or UK. Because the factor is exact rather than approximate, the result carries no rounding error beyond the decimal places you choose to display.
Frequently asked questions
How many inches is exactly 30 cm?
30 cm ÷ 2.54 = 11.811 inches. It's a common reference size since it's close to one foot (12 in).
Why is 1 inch exactly 2.54 cm instead of an approximation?
Since 1959, the US, UK and other countries have defined the international inch as exactly 2.54 cm, unifying the imperial and metric systems.
How many centimeters is a 24-inch screen?
Multiply 24 × 2.54 = 60.96 cm diagonally. Remember screen inches measure the diagonal, not the width or height.
How much precision do I need for everyday measurements?
1 or 2 decimals are enough for clothing, furniture or height. For technical or precision work, 4 decimals avoid accumulated rounding errors.