How many inches are in a centimeter?

1 cm is about 0.3937 in. The figure comes from dividing 1 by 2.54, because 1 in is exactly 2.54 cm.

What is 170 cm in feet and inches?

170 cm is about 66.93 in, or 5 ft 6.93 in. In decimal feet that is about 5.577 ft. Round to 5 ft 7 in for a form field.

How do I convert centimeters to inches in my head?

Divide the centimeters by 2.54. For 30 cm that gives about 11.81 in. Dividing by 2.5 gives 12 in, which works as a quick estimate.

How many inches is 100 cm?

100 cm is about 39.37 in. That is a little over 3 ft 3 in.

1 cm ≈ 0.3937 in — cm to Inches Converter

Enter a value to instantly convert between length units.

From

Precision4 dp

1 Centimeter = 0.3937 Inch

Key Formulas

Centimeter → Inch

in = cm × 0.393701

Kilometer → Mile

mi = km × 0.621371

Foot → Meter

m = ft × 0.3048

Inch → Centimeter

cm = in × 2.54

Formula

in = cm × (0.01 / 0.0254)

Converting centimeters to inches multiplies by 0.01 / 0.0254, which is about 0.3937 inches per centimeter. This converter uses the international inch of 2.54 cm, so 2.54 cm comes to 1 in. People make this conversion for screen sizes, clothing measurements, and product dimensions listed in both metric and US customary units. The centi- prefix means one hundredth, as the BIPM SI prefix table shows. NIST Handbook 44 gives the inch relationships. Keep extra digits until the final step, since 1 cm is a non-terminating decimal in inches.

Source: NIST named international length definitions (definition-derived arithmetic)

Reviewed by the Convert Calc editorial team · Last reviewed: 2026-10-06 · see our methodology

Frequently Asked Questions

Real-World Examples

Will a 5 cm screw fit a bracket slot marked 2 inches?

5 cm = 1.968503937 in

A 30 cm ruler listed in inches on a US stationery site.

30 cm = 11.81102362 in

A 100 cm curtain rod checked against a US retailer's size chart.

100 cm = 39.37007874 in

Height of 170 cm entered on a US form that asks for inches.

170 cm = 66.92913386 in

km to miles feet to meters inches to cm miles to km meters to feet nautical miles to miles miles to nautical miles feet to inches

See This in Context

Shipping Construction Metric, US Customary, and Imperial Conversion Chart