42 inch is equal to 1066.8 millimeters.
To convert inches to millimeters, multiply the number of inches by 25.4, since one inch equals 25.4 millimeters. For 42 inches, this calculation gives the length in millimeters.
Conversion Tool
Result in mm:
Conversion Formula
The conversion from inch to millimeters uses the constant factor 25.4. This means 1 inch equals exactly 25.4 mm. You multiply the inch value by 25.4 to get the length in millimeters.
For example, to convert 42 inches:
- Start with 42 inches.
- Multiply 42 by 25.4 (42 × 25.4).
- This equals 1066.8 millimeters.
This works because the inch is defined internationally as 25.4 millimeters, making the conversion linear and direct.
Conversion Example
- Convert 10 inches to millimeters:
- Multiply 10 by 25.4.
- Result is 254 mm.
- Convert 25.5 inches to millimeters:
- 25.5 × 25.4 = 647.7 mm.
- Convert 60 inches to millimeters:
- 60 × 25.4 = 1524 mm.
- Convert 5.75 inches to millimeters:
- 5.75 × 25.4 = 146.05 mm.
- Convert 100 inches to millimeters:
- 100 × 25.4 = 2540 mm.
Conversion Chart
| Inches | Millimeters (mm) |
|---|---|
| 17.0 | 431.8 |
| 22.0 | 558.8 |
| 27.0 | 685.8 |
| 32.0 | 812.8 |
| 37.0 | 939.8 |
| 42.0 | 1066.8 |
| 47.0 | 1193.8 |
| 52.0 | 1320.8 |
| 57.0 | 1447.8 |
| 62.0 | 1574.8 |
| 67.0 | 1701.8 |
The chart shows inch values in left column and corresponding millimeter values on right. To use the chart, find your inch value and read across to see the millimeters. This helps quick reference without calculation.
Related Conversion Questions
- How many millimeters are in 42 inches exactly?
- Can 42 inch be converted to mm without rounding errors?
- What is the formula to convert 42 inch to millimeters?
- Is 42 inch longer than 1000 millimeters?
- How do you convert 42 inches to millimeters by hand?
- What’s the millimeter value for 42 inch in engineering drawings?
- How precise is the conversion from 42 inches to millimeters?
Conversion Definitions
Inch: An inch is a unit of length used in the imperial and US customary systems, equal to exactly 25.4 millimeters. It is subdivided into smaller parts like halves, quarters, and sixteenths, commonly used for measuring small objects or screen sizes.
Millimeter (mm): A millimeter is a metric unit of length equal to one thousandth of a meter. It is often used to measure small distances, thickness, or dimensions in science, engineering, and manufacturing due its precision and ease of use in the metric system.
Conversion FAQs
Why is one inch defined as 25.4 millimeters?
The inch was internationally standardized in 1959 to exactly 25.4 millimeters to unify measurement systems between countries. Before that, inch length varied slightly by region. Defining it exactly helps avoid confusion in scientific and industrial fields.
Can I convert inches to millimeters without a calculator?
Yes, by multiplying the inch value by 25.4. For smaller numbers, you can estimate by multiplying by 25 and adding a bit more. For example, 10 inches roughly equals 250 mm plus a little extra, close to 254 mm. Using conversion tables also helps.
Does converting 42 inches to millimeters lose precision?
Since one inch equals exactly 25.4 millimeters, the conversion does not lose precision if done with exact multiplication. However, rounding decimals could introduce small errors depending on decimal places used.
Are there tools that convert inches to millimeters automatically?
Yes, many online calculators and digital tools convert inch to mm instantly. Some devices also have built-in unit converters. The JavaScript tool above is an example that converts any inch value to millimeters on input.
What industries require converting inches to millimeters?
Manufacturing, engineering, construction, and design commonly convert between inches and millimeters. This is necessary because some regions use imperial units, while others use metric units, so accurate conversions ensure compatibility of parts and measurements.