0.25 as a Fraction of an Inch
Answer
1/4 in
0.25 in = 1/4 in (1/64 in) = 6.35 mm
0.25 inches equals 1/4 inch, one of the four main marks on every tape measure alongside 1/2, 3/4, and the whole inch. It is a standard bolt and lag screw diameter, a common nominal plywood thickness, and a size found on almost every fractional drill index and socket set. Because a quarter inch is an exact multiple of 1/16 in, it reads as 1/4 in whether you round to 1/16, 1/32, or 1/64 precision.
Try another decimal
Nearest 1/16
1/4"
Nearest 1/32
1/4"
Millimeters
6.35 mm
Related values
| Value | Result |
|---|---|
| Nearest 1/8 in | 1/4 in |
| Nearest 1/16 in | 1/4 in |
| Nearest 1/32 in | 1/4 in |
| Nearest 1/64 in | 1/4 in |
| Millimeters | 6.35 mm |
| Centimeters | 0.635 cm |
| Feet | 0.020833 ft |
How the conversion works
- Split the decimal. Separate the whole-number part from the decimal part. 0.25 has no whole-number portion, so the full value goes into the fraction conversion.
- Multiply by precision. Multiply the decimal by the denominator you want, 16, 32, or 64, then round to the nearest whole number. 0.25 × 16 = 4 exactly, with no rounding required.
- Simplify. Reduce the fraction using the greatest common divisor of numerator and denominator. 4/16 shares a factor of 4, which simplifies down to 1/4.
- Verify in mm. Multiply the decimal inches by 25.4 to check the metric equivalent: 0.25 × 25.4 = 6.35 mm.
Frequently Asked Questions
0.25 inches equals 1/4 in. This is exact at every common precision, 1/16, 1/32, and 1/64, because a quarter inch is a round number of sixteenths with nothing to round away.
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