0.125 as a Fraction of an Inch
Answer
1/8 in
0.125 in = 1/8 in (1/64 in) = 3.175 mm
0.125 inches equals 1/8 inch, a size you will find on nearly every hardware store shelf. It is the nominal thickness of thin plywood and hardboard panels, a standard fractional drill bit, and a common socket and hex key size. Because 0.125 is an exact eighth, it stays 1/8 in whether you round to 1/16, 1/32, or 1/64 precision, and it sits exactly halfway between 0.0625 in (1/16 in) and 0.25 in (1/4 in).
Try another decimal
Nearest 1/16
1/8"
Nearest 1/32
1/8"
Millimeters
3.175 mm
Related values
| Value | Result |
|---|---|
| Nearest 1/8 in | 1/8 in |
| Nearest 1/16 in | 1/8 in |
| Nearest 1/32 in | 1/8 in |
| Nearest 1/64 in | 1/8 in |
| Millimeters | 3.175 mm |
| Centimeters | 0.3175 cm |
| Feet | 0.010417 ft |
How the conversion works
- Split the decimal. Separate the whole-number part from the decimal part. 0.125 has no whole-number portion, so the full value goes into the fraction calculation.
- Multiply by precision. Multiply the decimal by the denominator you want, 16, 32, or 64, then round to the nearest whole number. 0.125 × 16 = 2 exactly, with no rounding needed.
- Simplify. Reduce the fraction using the greatest common divisor of numerator and denominator. 2/16 shares a factor of 2, so it simplifies to 1/8.
- Verify in mm. Multiply the decimal inches by 25.4 to check the metric value: 0.125 × 25.4 = 3.175 mm.
Frequently Asked Questions
0.125 inches equals 1/8 in. This holds true at 1/16, 1/32, and 1/64 precision since 0.125 divides evenly into eighths with nothing left to round away.
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1/8 Inch as Decimal
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0.0625 as a Fraction
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