0.625 inches is equal to 15.875 millimeters.
To convert inches to millimeters, we multiply the inch value by 25.4 because one inch equals exactly 25.4 millimeters. Therefore, 0.625 inches multiplied by 25.4 gives the millimeter equivalent.
Conversion Tool
Result in mm:
Conversion Formula
The formula to convert inches to millimeters is:
millimeters = inches × 25.4
This formula works because one inch is defined internationally as exactly 25.4 millimeters. Multiplying any value in inches by 25.4 converts it directly into millimeters.
For example, to convert 0.625 inches:
- Start with 0.625 inches
- Multiply by 25.4 (the number of millimeters in one inch)
- 0.625 × 25.4 = 15.875 millimeters
Conversion Example
- Convert 2 inches to millimeters:
- Multiply 2 × 25.4
- Result is 50.8 mm
- Convert 5.5 inches to millimeters:
- Multiply 5.5 × 25.4
- Result is 139.7 mm
- Convert 0.1 inches to millimeters:
- Multiply 0.1 × 25.4
- Result is 2.54 mm
- Convert 12 inches to millimeters:
- Multiply 12 × 25.4
- Result is 304.8 mm
Conversion Chart
| Inches | Millimeters (mm) |
|---|---|
| -24.4 | -619.76 |
| -20.0 | -508.00 |
| -15.5 | -393.70 |
| -10.0 | -254.00 |
| -5.0 | -127.00 |
| 0 | 0.00 |
| 5.0 | 127.00 |
| 10.0 | 254.00 |
| 15.0 | 381.00 |
| 20.0 | 508.00 |
| 25.6 | 650.24 |
The chart shows inch values on left and their equivalent millimeter values on right. You can find a inch value close to your measurement and see the corresponding mm value without calculation.
Related Conversion Questions
- How many millimeters are 0.625 inches exactly?
- What is the formula to convert 0.625 inches into millimeters?
- Is 0.625 inches bigger or smaller than 15 millimeters?
- How do I convert 0.625 inches to mm using a calculator?
- What’s the millimeter value of 5/8 inch (0.625 inches)?
- Can 0.625 inches be rounded to 16 mm?
- Why does 0.625 inches equal 15.875 mm in conversion?
Conversion Definitions
Inches: An inch is a unit of length in the imperial and US customary systems, equal to 1/12 of a foot. It is used mostly in the United States, Canada, and United Kingdom for measuring small distances like height, width, or thickness. One inch equals exactly 25.4 millimeters.
Millimeters (mm): The millimeter is a metric unit of length, one thousandth of a meter. It is widely used around the world for precise measurements in science, engineering, and manufacturing. Millimeters provide a finer scale than centimeters or inches for small distances.
Conversion FAQs
What causes the inch to be exactly 25.4 mm?
The inch was internationally standardized to exactly 25.4 millimeters in 1959 by agreement among English-speaking countries. Before that, inches had slightly different lengths in different countries, but the 25.4 mm value is now official and used for all conversions.
Can I convert inches to millimeters without a calculator?
You can approximate by multiplying by 25 and adding a small fraction, but for accurate results, multiplying by 25.4 is needed. Using a calculator or online tool makes the process fast and error-free.
Why does 0.625 inches equal 15.875 mm?
Because 0.625 is the decimal for 5/8 inch, and multiplying by 25.4 converts to millimeters. So 0.625 × 25.4 equals 15.875 mm exactly, by definition of the units.
Are there negative values in inch to mm conversion?
Yes, length can be negative in math or physics contexts to represent direction or position relative to a point. Negative inches convert to negative millimeters by the same multiplication factor.
What’s the best way to remember inch to mm conversion?
Remember that one inch equals 25.4 mm. Multiply inches by 25.4 to get millimeters. For quick estimates, 1 inch ≈ 25 mm is sometimes used but less accurate.