Inches to Centimeters Converter (in to cm)

Q: What is 1 inch in cm?

Exactly 1 inch is equal to 2.54 centimeters (cm). This is the standard, internationally accepted value.

Q: How do you convert 5' 6" (feet and inches) to cm?

To convert feet and inches to cm, you must first convert everything to inches and then multiply by 2.54. 1. First, convert 5 feet to inches: 5 feet * 12 inches/foot = 60 inches. 2. Add the remaining 6 inches: 60 in + 6 in = 66 inches. 3. Convert the total inches to cm: 66 in * 2.54 cm/in = 167.64 cm. So, 5' 6" is equal to 167.64 cm.

Q: Is 1 cm bigger than 1 inch?

No, 1 inch is bigger than 1 cm. One inch is 2.54 times larger than one centimeter.

Q: Why is an inch exactly 2.54 cm?

This value was standardized by international agreement in 1959. Countries using both the imperial (like the US and UK) and metric systems agreed to define the 'international yard' as exactly 0.9144 meters. Since there are 36 inches in a yard, one inch was defined as 0.9144 / 36 = 0.0254 meters, which is exactly 2.54 centimeters.

Easily convert between inches (in) and centimeters (cm) with our simple, bidirectional converter. This tool also supports fractional inches, making it perfect for both precise measurements and everyday use. Just enter a value in either field to get an instant conversion.

Inches (in)

Enter a decimal or a whole number and a fraction (like 1/2, 3/8).

Centimeters (cm)

Enter a value in centimeters to convert to inches.

Dynamic Conversion Chart

Based on your input, here is a chart of nearby values.

Inches (in)	Centimeters (cm)

The Conversion Formula

The conversion between inches and centimeters is based on a single, exact value defined by international agreement:

$1 \text{ inch} = 2.54 \text{ centimeters}$

This means that to convert from inches to centimeters, you multiply your inch value by 2.54. Conversely, to convert from centimeters to inches, you divide your centimeter value by 2.54.

Formula (in to cm): $cm = inches \times 2.54$
Formula (cm to in): $inches = cm \div 2.54$

How to Convert Inches to Centimeters

Follow these simple steps to manually convert any measurement from inches to cm.

Get your measurement in inches. This can be a decimal (like 6.5) or a fraction (like 6 1/2). If it's a fraction, convert it to a decimal first (e.g., 1/2 = 0.5, so 6 1/2 = 6.5).
Multiply by 2.54. Take your decimal inch value and multiply it by 2.54.
The result is your length in centimeters.

Example: Convert 8 inches to cm.

$8 \text{ in} \times 2.54 = 20.32 \text{ cm}$

Inches to Centimeters Quick Reference Table

Here is a quick lookup table for common conversions, especially useful for measurements on a standard 12-inch ruler.

Inches (in)	Centimeters (cm)
1 in	2.54 cm
2 in	5.08 cm
3 in	7.62 cm
4 in	10.16 cm
5 in	12.70 cm
6 in	15.24 cm
7 in	17.78 cm
8 in	20.32 cm
9 in	22.86 cm
10 in	25.40 cm
11 in	27.94 cm
12 in (1 ft)	30.48 cm

Frequently Asked Questions (FAQ)

What is 1 inch in cm?

How do you convert 5' 6" (feet and inches) to cm?

Is 1 cm bigger than 1 inch?

Why is an inch exactly 2.54 cm?

Audit: Complete

Formula (LaTeX) + variables + units

This section shows the formulas used by the calculator engine, plus variable definitions and units.

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  $1 \text{ inch} = 2.54 \text{ centimeters}$

      Variables and units
      
        No variables provided in audit spec.
      
    
  

  
    Sources (authoritative):
    
      No sources provided in audit spec.
    
  

  
    Changelog

    
      Version: 0.1.0-draft

      Last code update: 2026-01-19
    
    
  0.1.0-draft · 2026-01-19
  
    Initial audit spec draft generated from HTML extraction (review required).
Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
Confirm sources are authoritative and relevant to the calculator methodology.
  

  

  
    Verification pending · Last code update: 2026-01-19

 \text{ inch} = 2.54 \text{ centimeters}$

      Variables and units
      
        No variables provided in audit spec.
      
    
  

  
    Sources (authoritative):
    
      No sources provided in audit spec.
    
  

  
    Changelog

    
      Version: 0.1.0-draft

      Last code update: 2026-01-19
    
    
  0.1.0-draft · 2026-01-19
  
    Initial audit spec draft generated from HTML extraction (review required).
Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
Confirm sources are authoritative and relevant to the calculator methodology.
  

  

  
    Verification pending · Last code update: 2026-01-19

 \text{ inch} = 2.54 \text{ centimeters}$

      Variables and units
      
        No variables provided in audit spec.
      
    
  

  
    Sources (authoritative):
    
      NIST — Weights and measures — nist.gov · Accessed 2026-01-19
https://www.nist.gov/pml/weights-and-measures
NIST — SI units — nist.gov · Accessed 2026-01-19
https://www.nist.gov/pml/owm/metric-si/si-units
    
  

  
    Changelog

    
      Version: 0.1.0-draft

      Last code update: 2026-01-19
    
    
  0.1.0-draft · 2026-01-19
  
    Initial audit spec draft generated from HTML extraction (review required).
Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
Confirm sources are authoritative and relevant to the calculator methodology.
  

  

  
    Verified by Ugo Candido on 2026-01-19

    Profile ·
    LinkedIn
  

 \text{ inch} = 2.54 \text{ centimeters}$

      Variables and units
      
        No variables provided in audit spec.
      
    
  

  
    Sources (authoritative):
    
      NIST — Weights and measures — nist.gov · Accessed 2026-01-19
https://www.nist.gov/pml/weights-and-measures
NIST — SI units — nist.gov · Accessed 2026-01-19
https://www.nist.gov/pml/owm/metric-si/si-units
    
  

  
    Changelog

    
      Version: 0.1.0-draft

      Last code update: 2026-01-19
    
    
  0.1.0-draft · 2026-01-19
  
    Initial audit spec draft generated from HTML extraction (review required).
Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
Confirm sources are authoritative and relevant to the calculator methodology.
  

  

  
    Verified by Ugo Candido on 2026-01-19

    Profile ·
    LinkedIn
  

 \text{ inch} = 2.54 \text{ centimeters}$

      Variables and units
      
        No variables provided in audit spec.
      
    
  

  
    Sources (authoritative):
    
      NIST — Weights and measures — nist.gov · Accessed 2026-01-19
https://www.nist.gov/pml/weights-and-measures
NIST — SI units — nist.gov · Accessed 2026-01-19
https://www.nist.gov/pml/owm/metric-si/si-units
    
  

  
    Changelog

    
      Version: 0.1.0-draft

      Last code update: 2026-01-19
    
    
  0.1.0-draft · 2026-01-19
  
    Initial audit spec draft generated from HTML extraction (review required).
Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
Confirm sources are authoritative and relevant to the calculator methodology.
  

  

  
    Verified by Ugo Candido on 2026-01-19

    Profile ·
    LinkedIn
  

 \text{ inch} = 2.54 \text{ centimeters}$

Variables and units

No variables provided in audit spec.

Sources (authoritative):

NIST — Weights and measures — nist.gov · Accessed 2026-01-19
https://www.nist.gov/pml/weights-and-measures
NIST — SI units — nist.gov · Accessed 2026-01-19
https://www.nist.gov/pml/owm/metric-si/si-units

Changelog

Version: 0.1.0-draft
Last code update: 2026-01-19

0.1.0-draft · 2026-01-19

Initial audit spec draft generated from HTML extraction (review required).
Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
Confirm sources are authoritative and relevant to the calculator methodology.

Verified by Ugo Candido on 2026-01-19
Profile · LinkedIn