Fractional Inch to Decimal Equivalent Chart
Convert fractional inch measurements to decimal inches and millimeters for engineering applications
Fractional to Decimal Inch Conversion Chart
| Fractional Inch | Decimal Inch | Millimeters (mm) |
|---|---|---|
| 1/64 | 0.0156 | 0.396 |
| 1/32 | 0.0313 | 0.794 |
| 3/64 | 0.0469 | 1.191 |
| 1/16 | 0.0625 | 1.588 |
| 5/64 | 0.0781 | 1.984 |
| 3/32 | 0.0938 | 2.381 |
| 7/64 | 0.1094 | 2.778 |
| 1/8 | 0.1250 | 3.175 |
| 9/64 | 0.1406 | 3.572 |
| 5/32 | 0.1563 | 3.969 |
| 3/16 | 0.1875 | 4.763 |
| 1/4 | 0.2500 | 6.350 |
| 3/8 | 0.3750 | 9.525 |
| 1/2 | 0.5000 | 12.700 |
| 5/8 | 0.6250 | 15.875 |
| 3/4 | 0.7500 | 19.050 |
| 7/8 | 0.8750 | 22.225 |
| 1 | 1.0000 | 25.400 |
About Fractional Inch to Decimal and Metric Conversions
This comprehensive fractional inch to decimal equivalent chart provides precise conversions between fractional inches, decimal inches, and millimeters (mm). It serves as a vital reference for engineers, machinists, fabricators, and designers working with both imperial and metric measurement systems in manufacturing, machining, and construction.
Accurate measurement conversion is essential for ensuring dimensional consistency, proper component fit, and tolerance control in engineering and fabrication. This chart eliminates conversion errors when switching between imperial and metric systems, supporting precise calculations for drilling, milling, and assembly operations.
Fractional to Decimal Conversion Definitions
- Fractional Inch – Commonly used in North American measurement systems for mechanical, woodworking, and machining applications.
- Decimal Inch – The equivalent fractional measurement expressed in decimal form for high-precision calculations and digital tools.
- Millimeter (mm) – The metric equivalent of the inch, standardized globally for use in engineering and manufacturing design.
Engineering and Manufacturing Applications
The fractional to decimal conversion chart is widely used across mechanical design, CNC machining, woodworking, and metal fabrication. It assists professionals and students in:
- Determining exact decimal equivalents for standard fractional dimensions.
- Converting to metric units for international design standards and documentation.
- Ensuring fit accuracy for holes, fasteners, and mechanical assemblies.
- Improving efficiency in drafting, CAM programming, and inspection processes.
By referencing this inch-to-decimal and millimeter conversion guide, engineers and technicians can maintain accuracy across design stages, reduce rework, and ensure measurement uniformity in both imperial and metric-based projects. It remains an essential reference for precision-driven industries.