How do I convert cm to inches?
Type either value and the other one updates as you type.
- Inches (in)
- 0.393701
1 cm = 0.393701 in.
- Nearest 1/64 inch
- 25/64
Inches (in): 0.393701. 1 cm = 0.393701 in.
Inches (in) by centimeters (cm)
How to calculate
Converts centimeters (cm) to inches (in) and back, with the exact unit definitions.
Example with the default inputs (Centimeters (cm) 1): 1 cm = 0.393701 in.
Formula: in = cm × 0.393700787402 (the same as cm ÷ 2.54)
- 1 centimeter = 0.393700787402 inches, from the exact definitions in NIST SP 811.
- The answer shows at most 6 decimal places; the calculation keeps full precision.
Worked examples
Each example is checked against the calculator on every build.
- Centimeters (cm) 1 gives Inches (in) 0.393701.Source: exact unit definitions in NIST SP 811 (2008), Appendix B.8
- Centimeters (cm) 30 gives Inches (in) 11.811024.Source: exact unit definitions in NIST SP 811 (2008), Appendix B.8
- Inches (in) 11.811024 gives Centimeters (cm) 30.Source: exact unit definitions in NIST SP 811 (2008), Appendix B.8
Other questions people ask
How many inches are in a centimeter?
1 centimeter is 0.393701 inches, from the exact unit definitions (NIST SP 811).
How do I convert cm to inches?
Multiply by 0.393701: in = cm × 0.393700787402 (the same as cm ÷ 2.54). For example, 1 cm × 0.393701 = 0.393701 in.
How do I convert inches back to cm?
Multiply by 2.54, or type the inches into the second box and the converter works it out. 1 inch is 2.54 centimeters.