Diameter to Inches Calculator
Here’s a comprehensive table that covers the essential information for converting diameter measurements to inches:
| Unit | Conversion to Inches | Formula |
|---|---|---|
| Millimeters (mm) | 1 mm = 0.03937 inches | inches = mm ÷ 25.4 |
| Centimeters (cm) | 1 cm = 0.3937 inches | inches = cm ÷ 2.54 |
| Meters (m) | 1 m = 39.3701 inches | inches = m × 39.3701 |
| Feet (ft) | 1 ft = 12 inches | inches = ft × 12 |
| Yards (yd) | 1 yd = 36 inches | inches = yd × 36 |
Common Diameter Conversions
| Diameter | Inches (decimal) | Inches (fraction) |
|---|---|---|
| 6 mm | 0.2362″ | 15/64″ |
| 10 mm | 0.3937″ | 25/64″ |
| 1/4″ | 0.25″ | 1/4″ |
| 1/2″ | 0.5″ | 1/2″ |
| 1″ | 1″ | 1″ |
| 25 mm | 0.9843″ | 63/64″ |
| 50 mm | 1.9685″ | 1 31/32″ |
| 100 mm | 3.9370″ | 3 15/16″ |
DN (Diameter Nominal) to Inches
| DN | Inches (NPS) |
|---|---|
| 15 | 1/2″ |
| 25 | 1″ |
| 50 | 2″ |
| 100 | 4″ |
| 150 | 6″ |
| 200 | 8″ |
Key Points to Remember
- To convert from millimeters to inches, divide by 25.412.
- For quick estimations, 1 inch is approximately 25 mm2.
- When dealing with pipes, DN (Diameter Nominal) values are often used and have standardized inch equivalents3.
- Fractional inches are commonly used in practical applications, so rounding to the nearest 1/64″ is often sufficient4.
- For precise measurements, use decimal inches to at least 4 decimal places4.
This table provides a quick reference for common diameter conversions and the formulas needed to perform calculations. Whether you’re working with metric or imperial units, this information should help you convert diameters to inches efficiently.
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