Direct answer
One centimeter equals 0.393701 inches
There are approximately 0.393701 inches in one centimeter.
Standard centimeter conversion
Rounded ruler measurement
Exact metric relationship
The answer may be rounded according to its purpose. For a quick comparison, one centimeter can be described as about 0.39 inch or a little more than three-eighths of an inch.
Calculate whole and decimal centimeter measurements in decimal and fractional inches.
Ruler comparison
What fraction of an inch is one centimeter?
One centimeter equals approximately 0.393701 inch. This decimal is between three-eighths of an inch and seven-sixteenths of an inch.
Slightly shorter than 1 cm
Actual converted length
Longer than 1 cm
Rounded to the nearest eighth of an inch, one centimeter is 3/8 inch. Rounded to the nearest sixteenth, it is also 3/8 inch because 0.393701 is closer to 0.375 than to 0.4375.
One centimeter is about 3/8 inch, but the decimal value 0.393701 is more accurate.
Unit size
Is a centimeter smaller than an inch?
Yes. A centimeter is smaller than an inch. One inch contains exactly 2.54 centimeters.
About 0.3937 inch
Exactly 25.4 millimeters
One inch minus one centimeter
Put another way, one centimeter covers approximately 39.37% of one inch. Two centimeters equal approximately 0.7874 inch, which is still shorter than one inch.
A length of 2.54 centimeters is the exact point at which the metric measurement equals one complete inch.
Measurement systems
Why does one centimeter equal 0.393701 inches?
The centimeter and inch belong to different measurement systems. Modern conversion uses the exact relationship that one inch equals 2.54 centimeters.
To determine how many inches are in one centimeter, divide 1 by 2.54.
The result is commonly rounded to 0.393701 inch.
The converted value is not a simple terminating decimal because one centimeter is not an exact whole-number fraction of an inch.
Common multiples
How many inches are in common centimeter values?
| Centimeters | Inches | Approximate fraction |
|---|---|---|
| 1 cm | 0.393701 in | About 3/8 in |
| 2 cm | 0.787402 in | About 13/16 in |
| 2.54 cm | 1 in | Exactly 1 in |
| 5 cm | 1.968504 in | About 1 15/16 in |
| 10 cm | 3.937008 in | About 3 15/16 in |
| 20 cm | 7.874016 in | About 7 7/8 in |
| 25 cm | 9.842520 in | About 9 13/16 in |
| 30 cm | 11.811024 in | About 11 13/16 in |
Fractional values in the table are rounded for practical comparison. Decimal inches provide a more precise representation.
Everyday interpretation
When the one-centimeter relationship is useful
Reading rulers and tape measures
Metric rulers divide centimeters into millimeters, while inch rulers use common fractions. Knowing that one centimeter is about 3/8 inch helps compare marks quickly.
Product dimensions
Small dimensions such as thickness, width, clearance, and spacing may be listed in centimeters. The relationship helps determine their approximate size in inches.
Clothing and body measurements
Size charts may differ by country. Centimeter measurements for waist, chest, sleeve, inseam, and garment length can be converted to inches for comparison.
Crafts and household projects
Sewing patterns, art supplies, paper sizes, furniture plans, and instructions may mix metric and inch-based measurements.
Related values
One centimeter in other length units
| Unit | Equivalent to one centimeter |
|---|---|
| Millimeters | 10 mm |
| Meters | 0.01 m |
| Inches | 0.393701 in |
| Feet | 0.0328084 ft |
| Yards | 0.0109361 yd |
Continue reading
Related centimeters-to-inches guides
Questions and answers
Frequently asked questions
How many inches are exactly in one centimeter?
One centimeter equals approximately 0.393700787 inches, commonly rounded to 0.393701 inch.
Is one centimeter equal to half an inch?
No. One centimeter is approximately 0.3937 inch, which is less than one-half inch.
What fraction of an inch is one centimeter?
One centimeter is approximately three-eighths of an inch when rounded to a common ruler fraction.
How many centimeters are in one inch?
One inch equals exactly 2.54 centimeters.
Convert a measurement
Use the Centimeters to Inches Converter
Enter any whole or decimal centimeter value to calculate decimal inches and a rounded common fraction.
Open Centimeters to Inches ConverterLast updated: July 27, 2026