42 inches is equal to 1066.8 millimeters.
The conversion from inches to millimeters is done by multiplying the inch value by 25.4, because 1 inch equals exactly 25.4 millimeters. So, 42 inches times 25.4 gives 1066.8 mm.
Conversion Tool
Result in mm:
Conversion Formula
The formula to convert inches to millimeters is:
millimeters = inches × 25.4
Here, 25.4 is the exact number of millimeters in one inch. This works because the inch is internationally defined as exactly 25.4 mm. So multiplying the number of inches by 25.4 converts the length to millimeters.
For example, converting 42 inches:
- Start with 42 inches
- Multiply by 25.4: 42 × 25.4
- Calculate: 42 × 25.4 = 1066.8
- Result: 1066.8 millimeters
Conversion Example
- Convert 15 inches to mm:
- Multiply 15 by 25.4
- 15 × 25.4 = 381
- Result is 381 mm
- Convert 28.5 inches to mm:
- Multiply 28.5 by 25.4
- 28.5 × 25.4 = 723.9
- So, 28.5 inches equals 723.9 mm
- Convert 50 inches to mm:
- Multiply 50 by 25.4
- 50 × 25.4 = 1270
- The value is 1270 mm
- Convert 33.3 inches to mm:
- Multiply 33.3 × 25.4
- 33.3 × 25.4 = 846.82
- The result is 846.82 mm
Conversion Chart
This chart shows the conversion from inches to millimeters for values between 17.0 and 67.0 inches. You can use it to quickly find the millimeter value without calculating.
| 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 |
Related Conversion Questions
- How many millimeters are in 42 inches exactly?
- What is the formula to change 42 inches into mm?
- Is 42 inches longer than 1000 mm?
- How do I convert 42 inch to millimeter without calculator?
- What is 42 inches converted to mm with decimals?
- Can you show the step-by-step for 42 inch to mm conversion?
- Does 42 inches equal more or less than 1 meter in mm?
Conversion Definitions
Inch: An inch is a unit of length in the imperial and US customary systems equal to 1/12 of a foot or exactly 25.4 millimeters. Often used for measuring smaller objects, it is divided into smaller fractions like halves, quarters, and eighths.
Millimeter (mm): A millimeter is a metric unit of length that equals one thousandth of a meter. It is commonly used to measure very small distances or thicknesses, and it helps provide precise measurements in engineering and manufacturing.
Conversion FAQs
Why is one inch equal to exactly 25.4 millimeters?
The inch was standardized internationally in 1959 by agreement between countries using imperial and metric systems. They fixed the inch as exactly 25.4 millimeters to make conversions consistent and avoid confusion from prior varying definitions.
Can I convert inches to millimeters by dividing instead of multiplying?
No, dividing will not convert inches to millimeters correctly. You must multiply inches by 25.4 because 1 inch is longer than 1 millimeter. Dividing would give a smaller number, which would be incorrect for this conversion.
Are millimeters more precise than inches?
Millimeters are smaller units than inches, so they provide more precise measurements when dealing with small lengths. Inches include fractions but millimeters can show exact numbers to decimal places for better accuracy in many fields.
Is it necessary to use decimal places when converting inches to mm?
Decimal places improve precision, especially in technical or engineering work. For everyday use, rounding to whole numbers may be fine, but decimals ensure the measurement stays accurate and consistent with the exact conversion factor.
How can I quickly estimate inches to millimeters without tools?
Since 1 inch is about 25 mm, you can multiply the number of inches by 25 to get a rough estimate in millimeters. This gives a close value but is less accurate than multiplying by 25.4 exactly.
