Inch to CM Converter
Convert inches to centimeters (cm) and cm to inches with exact decimals, millimeters, feet & inches, and nearest 1/16" and 1/32" fractions.
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What Is a Inch to CM Converter?
The Inch to CM Converter provides instantaneous, bidirectional conversion between imperial inches and metric centimeters based on the international yard and pound agreement of 1959, where 1 inch is defined as exactly 2.54 centimeters.
How to Use This Calculator
- Select conversion direction: Inches to Centimeters or Centimeters to Inches.
- Enter the value to convert.
- View instant results in centimeters, millimeters, meters, feet & inches, and nearest 1/16" and 1/32" tape fractions.
Exact Conversion Ratio
1\text{ in} = 2.54\text{ cm} = 25.4\text{ mm}, \quad 1\text{ cm} = \frac{1}{2.54} \approx 0.393700787\text{ in}The conversion factor 2.54 is mathematically exact by international treaty.
Worked Example
Scenario: Converting 10 inches to centimeters
Formula: cm = inches × 2.54
cm = 10 × 2.54 = 25.4 cm
In millimeters: 25.4 × 10 = 254 mm
Tips & Key Notes
- Remember the quick mental estimate: 1 inch is roughly 2.5 cm, and 10 cm is roughly 4 inches.
- For carpentry and construction, use the 1/16" fraction display to match standard imperial tape measures.
- In engineering and 3D printing, 1 mm is approximately 0.03937 inches (or ~40 thousandths of an inch).
Frequently Asked Questions
How many centimeters are in 1 inch?
There are exactly 2.54 centimeters in 1 inch.
How do you convert centimeters to inches manually?
Divide the number of centimeters by 2.54, or multiply centimeters by 0.3937. For example, 50 cm / 2.54 ≈ 19.685 inches.
What is 5 feet 7 inches in cm?
5 feet 7 inches equals 67 total inches. 67 × 2.54 = 170.18 cm.
How do I convert decimal inches to tape measure fractions?
Multiply the decimal portion by 16 (for 16ths of an inch) or 32 (for 32nds) and round to the nearest whole integer. For example, 0.625 × 16 = 10/16 = 5/8".
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