Centimeters to Inches Converter

Convert length between centimeters and inches, both directions on one page.

Convert

Centimeters to Inches Converter

Enter a value above.

To convert centimeters to inches, divide by 2.54; to convert inches to centimeters, multiply by 2.54. This factor is exact, not a rounded approximation -- the international inch has been formally defined as precisely 2.54 cm since 1959.

This comes up constantly when comparing US measurements (feet and inches) against metric plans, imported materials, or hardware specified in millimeters or centimeters.

For millimeter-scale precision, see the Millimeters to Inches converter instead -- useful for smaller, more precise measurements like fastener or pipe sizing.

Where these numbers come from

Standard unit-conversion factors. Material weight figures (where used) are typical averages -- check your specific supplier for exact density.

Frequently asked questions

Is 2.54 cm per inch an exact number or rounded?

Exact. The inch has been internationally defined as precisely 2.54 cm since a 1959 agreement standardized it across English-speaking countries.

Which is more precise for construction work, cm or mm?

Millimeters, generally -- most metric measuring tools and building plans use mm for anything requiring fine precision, reserving cm for larger, rougher measurements.

Do US building materials come in metric sizes?

Rarely for standard US lumber and drywall, though some imported materials, fasteners, and specialty products are metric-sized -- this converter helps compare the two when that comes up.

Need to calculate something else?

Explore the whole Calcs family here.

Think we got it wrong?

Not happy with our calculations or how it works? Let us know.

Don't see a calculator you need?

Have a suggestion for a calculator you don't see here? Let us know.

All HomeBuildCalcs tools

Centimeters to Inches Converter