0.3125 as a Fraction of an Inch
Answer
5/16 in
0.3125 in = 5/16 in (1/64 in) = 7.9375 mm
0.3125 inches equals 5/16 inch, a widely used bolt, wrench, and socket size in automotive and general hardware work. It also serves as a common tap drill and wood dowel diameter. Sitting exactly between 1/4 in (0.25 in) and 3/8 in (0.375 in), it rounds to the same 5/16 in whether you use 1/16, 1/32, or 1/64 precision.
Try another decimal
Nearest 1/16
5/16"
Nearest 1/32
5/16"
Millimeters
7.9375 mm
Related values
| Value | Result |
|---|---|
| Nearest 1/8 in | 3/8 in |
| Nearest 1/16 in | 5/16 in |
| Nearest 1/32 in | 5/16 in |
| Nearest 1/64 in | 5/16 in |
| Millimeters | 7.9375 mm |
| Centimeters | 0.7937 cm |
| Feet | 0.026042 ft |
How the conversion works
- Split the decimal. Separate the whole-number part from the decimal part. 0.3125 has no whole-number portion, so the full value converts into the fraction.
- Multiply by precision. Multiply the decimal by the denominator you want, 16, 32, or 64, then round to the nearest whole number. 0.3125 × 16 = 5 exactly, with nothing to round off.
- Simplify. Reduce the fraction using the greatest common divisor of numerator and denominator. 5 and 16 share no common factor, so 5/16 is already fully reduced.
- Verify in mm. Multiply the decimal inches by 25.4 to double-check the metric value: 0.3125 × 25.4 = 7.9375 mm.
Frequently Asked Questions
0.3125 inches equals 5/16 in. That answer stays fixed at 1/16, 1/32, and 1/64 precision because 0.3125 is already an exact number of sixteenths.
Related Tools
🔢
Decimal to Fraction
Any decimal
➗
Fraction to Decimal
Any fraction
📐
MM to Inches
Metric converter
📊
Decimal Chart
Full reference
📏
5/16 Inch as Decimal
Fraction equivalent
📏
0.375 as a Fraction
Next size up
Back to the main calculator.