Fractions Calculator
Decimal to Fraction Inches Calculator
Convert decimal inch measurements to the nearest standard fractional inch
How to Convert Decimal Inches to Fractions
Fractional inches are the standard in US woodworking, construction, and machining. The most common denominators are 2, 4, 8, 16, 32, and 64. To convert a decimal to a fraction:
- Choose your required precision (e.g., nearest 1/16″)
- Multiply the decimal part by the denominator (e.g., 0.75 × 16 = 12)
- Round to the nearest whole number to get the numerator (12)
- Simplify: 12/16 = 3/4
Common Decimal to Fraction Reference
| Decimal Inches | Fraction | MM Equivalent |
|---|---|---|
| 0.0625″ | 1/16″ | 1.5875 mm |
| 0.125″ | 1/8″ | 3.1750 mm |
| 0.1875″ | 3/16″ | 4.7625 mm |
| 0.25″ | 1/4″ | 6.3500 mm |
| 0.3125″ | 5/16″ | 7.9375 mm |
| 0.375″ | 3/8″ | 9.5250 mm |
| 0.4375″ | 7/16″ | 11.1125 mm |
| 0.5″ | 1/2″ | 12.7000 mm |
| 0.5625″ | 9/16″ | 14.2875 mm |
| 0.625″ | 5/8″ | 15.8750 mm |
| 0.6875″ | 11/16″ | 17.4625 mm |
| 0.75″ | 3/4″ | 19.0500 mm |
| 0.8125″ | 13/16″ | 20.6375 mm |
| 0.875″ | 7/8″ | 22.2250 mm |
| 0.9375″ | 15/16″ | 23.8125 mm |
| 1″ | 1″ | 25.4000 mm |
💡 Click any row to load that decimal value
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Why Fractions?
Fractional inches are the standard in US construction and machining because they allow precise measurements without long decimals. The most common are 1/16″ and 1/32″ for general work, and 1/64″ for precision machining.