Practical measurement guide
Inch vs CM
Compare inches and centimeters, learn that 1 inch equals 2.54 cm, and see when each unit is commonly used.
One inch equals exactly 2.54 centimeters, so centimeters are the smaller metric unit.
Review the exact factors, rounding method, and authoritative sources.
in
Decimals and fractions work, for example 1.5, 1/2, or 1 1/2.
cm
Fractions
1 in = 2.54 cm
1 in × 2.54 = 2.54 cm
Decimal inches1 in
Feet + inches0 ft 1 in
Nearest 1/16 inch1"
The exact difference
An inch is an imperial length unit, while a centimeter is a metric unit. One inch equals exactly 2.54 centimeters.
When each unit is useful
Inches are common in US product sizes and screen diagonals. Centimeters are common in metric forms, international dimensions, and height records.
Related measurement tools
Frequently asked questions
Which is bigger, inch or cm?
An inch is bigger. One inch equals 2.54 centimeters.
Are inches metric?
No. Inches are imperial; centimeters are metric.