008 inches equals 20.32 millimeters.
To convert 008 inches to millimeters, you multiply the number of inches by 25.4 because there are exactly 25.4 millimeters in one inch. Thus, 008 inches times 25.4 gives the result in millimeters.
Conversion Tool
Result in mm:
Conversion Formula
To convert inches to millimeters, multiply the inch value by 25.4. This number is exact because 1 inch equals 25.4 millimeters by international agreement. The formula is:
millimeters = inches × 25.4
Why this works: Because the inch is based on the length defined by 25.4 mm exactly, multiplying inches by 25.4 converts the unit from inches into millimeters.
Example calculation for 008 inches:
- Start with 008 inches (which is 8 inches).
- Multiply 8 × 25.4 = 203.2
- Result is 203.2 mm.
Conversion Example
- Convert 5 inches to mm:
- Multiply 5 × 25.4
- Result: 127 mm
- Convert 12.5 inches to mm:
- 12.5 × 25.4 = 317.5
- So 12.5 inches equals 317.5 mm
- Convert 0.75 inches to mm:
- 0.75 × 25.4 = 19.05
- Therefore, 0.75 inches is 19.05 mm
- Convert 20 inches to mm:
- 20 × 25.4 = 508
- So 20 inches equals 508 mm
Conversion Chart
| Inches (in) | Millimeters (mm) |
|---|---|
| -17.0 | -431.8 |
| -12.0 | -304.8 |
| -7.0 | -177.8 |
| -2.0 | -50.8 |
| 0.0 | 0.0 |
| 3.0 | 76.2 |
| 8.0 | 203.2 |
| 13.0 | 330.2 |
| 18.0 | 457.2 |
| 23.0 | 584.2 |
| 28.0 | 711.2 |
| 33.0 | 838.2 |
This chart shows conversion values from inches to millimeters for a range of inputs. You can find the inch value in the left column and see the equivalent millimeter value on the right. Use it to quickly check or approximate conversions without calculator.
Related Conversion Questions
- How many millimeters are in 008 inches exactly?
- What is 008 in converted to mm for engineering measurements?
- Can I convert 008 inches to millimeters using a simple multiplication?
- Why is 008 inches equal to 203.2 mm in metric units?
- What formula calculates 008 in to mm exactly?
- How does 008 inches convert to millimeters in construction projects?
- Is 008 inch longer or shorter than 20 millimeters?
Conversion Definitions
in (inch): The inch is a unit of length in the imperial and US customary systems, equal to 1/12 of a foot. It is used primarily in the United States, Canada, and UK, and defined internationally as exactly 25.4 millimeters. Inches measure small to medium lengths in everyday and technical fields.
mm (millimeter): The millimeter is a metric unit of length, equal to one thousandth of a meter, or 0.001 meters. It is commonly used worldwide for precise length measurements in science, engineering, and manufacturing. Millimeters allow fine resolution for measuring very small distances or thicknesses.
Conversion FAQs
Can I convert fractional inches like 0.125 in to millimeters accurately?
Yes, fractional inches can be converted to millimeters by multiplying the decimal value by 25.4. For example, 0.125 inches × 25.4 = 3.175 mm. Conversions for fractions are precise when you first convert fraction to decimal and then apply the multiplication.
Why is 1 inch exactly equal to 25.4 millimeters?
The inch was internationally defined as exactly 25.4 mm in 1959 by agreement among English-speaking countries to standardize measurements. This fixed length avoids small inconsistencies in manufacturing and engineering requiring precise unit conversions.
Does converting inches to millimeters lose precision?
Conversions themselves don’t lose precision if calculated exactly, but rounding to fewer decimal places can cause slight errors. Using enough decimal places when multiplying by 25.4 keeps conversions accurate for most practical purposes.
Are inches and millimeters interchangeable in technical drawings?
No, inches and millimeters are different units. Technical drawings specify which unit is used. If converting, the values must be changed properly to avoid errors in measurements or manufacturing parts.
How do I convert back from millimeters to inches?
To convert millimeters back to inches, divide the millimeter value by 25.4. For example, 50.8 mm ÷ 25.4 = 2 inches. This reverses the multiplication process used for inches to mm.
Last Updated : 22 July, 2025
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Sandeep Bhandari holds a Bachelor of Engineering in Computers from Thapar University (2006). He has 20 years of experience in the technology field. He has a keen interest in various technical fields, including database systems, computer networks, and programming. You can read more about him on his bio page.