Inch to Centimeter Converter
Enter the value that you want to convert inch (in) to centimeter (cm) or centimeter to inch.Also written as IN to CM conversion.
1 inch = 2.5400000 centimeter
Formula: centimeter = inch value × 2.5400000
IN to CM — inch to centimeter
10 inch = 25.40000 centimeter
Popular Length Converters:
Inch to Centimeter: The Essentials
The Inch Explained
Inch (in) is a unit of length measurement. 1 inch is equal to 2.5400000 centimeter.
What is Centimeter?
Centimeter (cm) is a unit of length measurement. 1 centimeter is equal to 0.3937008 inch.
Length Conversions in Practice
Length conversions connect the metric system used by most of the world with the imperial system still dominant in the United States, UK construction, and aviation. Architects convert between meters and feet for international projects. Machinists work in thousandths of an inch while referencing metric specifications. Runners compare kilometer race distances to miles. Screen sizes, paper formats, and fabric measurements all require frequent conversion between systems.
inch to centimeter metric conversion table
| 0.01 in | = | 0.02540 cm |
| 0.1 in | = | 0.25400 cm |
| 1 in | = | 2.54000 cm |
| 2 in | = | 5.08000 cm |
| 3 in | = | 7.62000 cm |
| 4 in | = | 10.16000 cm |
| 5 in | = | 12.70000 cm |
| 6 in | = | 15.24000 cm |
| 7 in | = | 17.78000 cm |
| 8 in | = | 20.32000 cm |
| 9 in | = | 22.86000 cm |
| 10 in | = | 25.40000 cm |
| 11 in | = | 27.94000 cm |
| 12 in | = | 30.48000 cm |
| 13 in | = | 33.02000 cm |
| 14 in | = | 35.56000 cm |
| 15 in | = | 38.10000 cm |
| 16 in | = | 40.64000 cm |
| 17 in | = | 43.18000 cm |
| 18 in | = | 45.72000 cm |
| 19 in | = | 48.26000 cm |
| 20 in | = | 50.80000 cm |
| 30 in | = | 76.20000 cm |
| 40 in | = | 101.60000 cm |
| 50 in | = | 127.00000 cm |
| 60 in | = | 152.40000 cm |
| 70 in | = | 177.80000 cm |
| 80 in | = | 203.20000 cm |
| 90 in | = | 228.60000 cm |
| 100 in | = | 254.00000 cm |
| 200 in | = | 508.00000 cm |
| 300 in | = | 762.00000 cm |
| 400 in | = | 1016.00000 cm |
| 500 in | = | 1270.00000 cm |
| 600 in | = | 1524.00000 cm |
| 700 in | = | 1778.00000 cm |
| 800 in | = | 2032.00000 cm |
| 900 in | = | 2286.00000 cm |
| 1000 in | = | 2540.00000 cm |
How to Convert IN to CM (Inch to Centimeter)?
We can convert inch to centimeter by using an example.
Example:
Convert 20 Inch to Centimeter?
We know 1 Inch = 2.5400000 centimeter; 1 Centimeter = 0.3937008 inch.
20 inch = ___cm
20 × 2.5400000 = 50.80000 cm (we know 1 inch = 2.5400000 centimeter)
Answer:
20 inch = 50.80000 centimeter
How to Convert Inches to Centimeters (Step-by-Step)
Converting inches to centimeters is essential when translating US measurements to the metric system used globally. Since 1 inch is defined as exactly 2.54 cm, simply multiply by 2.54.
- Write down the measurement in inches.
- Multiply the inch value by 2.54.
- The result is the equivalent length in centimeters.
Common Inch to Centimeter Conversions
Frequently used inch-to-cm conversions for height, baby measurements, and tool specifications.
| Inch | Centimeter |
|---|---|
| 1 inch | 2.54 cm |
| 5 inches | 12.7 cm |
| 12 inches | 30.48 cm |
| 36 inches | 91.44 cm |
| 60 inches | 152.4 cm |
| 66 inches | 167.64 cm |
| 70 inches | 177.8 cm |
| 72 inches | 182.88 cm |
Solved Examples: Inches to cm
Question 1: A baby is 21 inches long at birth. What is this in centimeters?
Solution:
Use the formula: cm = inches × 2.54
= 21 × 2.54
= 53.34 cm
Answer: 21 inches = 53.34 cm (average newborn length)
Question 2: A person is 5 feet 9 inches tall. Convert to centimeters.
Solution:
First convert to total inches: 5 × 12 + 9 = 69 inches
cm = 69 × 2.54
= 175.26 cm
Answer: 5'9" = 175.26 cm (often rounded to 175 cm on medical forms)
Question 3: A wrench is labeled 3/4 inch. What is this in cm?
Solution:
Convert fraction to decimal: 3/4 = 0.75 inches
cm = 0.75 × 2.54
= 1.905 cm
Answer: 3/4 inch = 1.905 cm (≈ 19 mm wrench)
Question 4: A US door is 80 inches tall. Convert to centimeters.
Solution:
cm = 80 × 2.54
= 203.2 cm
Answer: 80 inches = 203.2 cm (standard US interior door height)
Practice Questions
Try solving these on your own to test your understanding:
- Convert 24 inches to cm. (Answer: 60.96 cm)
- A baby is 30 inches long. How many cm is that? (Answer: 76.2 cm)
- Convert 5'11" to centimeters. (Answer: 180.34 cm)
- A 1/2 inch bolt — what is this in cm? (Answer: 1.27 cm)
- Convert 48 inches (standard bathtub length) to cm. (Answer: 121.92 cm)
US Height to Metric: A Complete Reference
In the US, height is expressed in feet and inches, while most of the world uses centimeters. To convert: multiply total inches by 2.54. Common heights: 5'0" = 152.4 cm, 5'4" = 162.56 cm, 5'6" = 167.64 cm, 5'8" = 172.72 cm, 5'10" = 177.8 cm, 6'0" = 182.88 cm, 6'2" = 187.96 cm, 6'4" = 193.04 cm. Medical records internationally use cm, so knowing your height in metric is important for travel and healthcare abroad.
Baby Growth Charts: Inches to Centimeters
Pediatricians in the US measure babies in inches, but WHO growth charts use centimeters. Key milestones: birth length averages 19-21 inches (48-53 cm), 3 months ≈ 24 inches (61 cm), 6 months ≈ 26.5 inches (67 cm), 12 months ≈ 30 inches (76 cm), 24 months ≈ 34 inches (86 cm). To track growth on international charts, multiply the inches measurement by 2.54.
Tool and Hardware Specifications
US tools are labeled in fractional inches (1/4", 3/8", 1/2", 5/8", 3/4", 7/8", 1") while metric tools use millimeters. Common conversions: 1/4" = 6.35 mm, 5/16" = 7.94 mm, 3/8" = 9.53 mm, 1/2" = 12.7 mm, 5/8" = 15.88 mm, 3/4" = 19.05 mm, 7/8" = 22.23 mm, 1" = 25.4 mm. Socket sets often include both SAE (inch) and metric sizes because vehicles use both standards.
Key Takeaways
- Multiply inches by 2.54 to get centimeters (exact conversion).
- Quick estimate: multiply inches by 2.5 for a fast approximation.
- To convert feet-and-inches to cm: (feet × 12 + inches) × 2.54.
- Average US male height: 5'10" = 177.8 cm; female: 5'4" = 162.56 cm.
- Fractional inches (3/8", 3/4") must be converted to decimals first.
- 12 inches = 30.48 cm (one foot) is a useful memorization anchor.
Inch to Centimeter Conversion Formula
centimeter = inch × 2.5400000
1 inch = 2.5400000 centimeter
1 centimeter = 0.3937008 inch
Reverse: inch = centimeter × 0.3937008
Frequently Asked Questions
How many centimeter are in 1 inch?
There are 2.5400000 centimeter in 1 inch. To convert inch to centimeter, multiply the value by 2.5400000.
How do I convert inch to centimeter?
Multiply your inch value by 2.5400000 to get the equivalent in centimeter. For example, 5 inch = 5 × 2.5400000 = 12.70000 centimeter.
How do I convert centimeter to inch?
Multiply your centimeter value by 0.3937008 to get the equivalent in inch. Alternatively, divide by 2.5400000.
What is 10 inch in centimeter?
10 inch is equal to 25.40000 centimeter.
What is 100 inch in centimeter?
100 inch is equal to 254.00000 centimeter.