CM to Inches Calculator
Converting centimeters to inches is frequently needed when working with metric blueprints, imported conduit fittings, or international equipment specifications. Since the US electrical trade uses imperial measurements for conduit sizing and layout, having a reliable cm-to-inches conversion on hand saves time and prevents costly errors.
This calculator takes any centimeter value and returns the equivalent in decimal inches. Enter your measurement and get an instant, accurate result you can use for conduit runs, box fill calculations, or any other field measurement.
CM to Inches Formula
Inches = Centimeters ÷ 2.54
1 inch = exactly 2.54 cm (international standard)
The conversion factor of 2.54 is exact by international agreement. For a quick mental estimate, you can multiply centimeters by 0.4 to approximate inches, but for precise conduit work always use the full formula.
Frequently Asked Questions
How do you convert centimeters to inches?
Divide the centimeter value by 2.54 to get inches. For example, 10 cm divided by 2.54 equals approximately 3.937 inches. One inch is defined as exactly 2.54 centimeters.
How many inches is 1 centimeter?
One centimeter equals approximately 0.3937 inches. To quickly estimate, you can multiply centimeters by 0.4 for a rough conversion, though the exact factor is 1 divided by 2.54.
When would an electrician need to convert cm to inches?
Electricians may encounter metric measurements on imported equipment, international blueprints, or metric conduit and fittings. Converting centimeters to inches ensures accurate layout, conduit cuts, and compliance with NEC standards that use imperial units.