1/64 as a decimal
1/64 = 0.015625 inches = 0.3969 mm.
0.015625
1/64 of an inch
Millimetres
0.3969 mm
Centimetres
0.03969 cm
Percent
1.5625%
Decimal
terminates
Where 1/64 falls at each precision, and whether the mark is the value exactly
| Rule | Nearest mark | Exact? |
|---|---|---|
| 1/16 | 0 | nearest |
| 1/32 | 1/32 | nearest |
| 1/64 | 1/64 | exact |
Converting 1/64 to a decimal
A fraction is a division. 1/64 = 1 ÷ 64 = 0.015625. The decimal terminates because 64 factors into 2 × 2 × 2 × 2 × 2 × 2 — only 2s and 5s, the factors of ten. Any fraction whose denominator is built from those has an exact decimal.
In metric that is 0.3969 millimetres (0.03969 cm), since one inch is exactly 25.4 mm. As a percentage of an inch it is 1.5625%.
1/64 is a real mark on a rule: it is the 1/64 mark on a 1/64 rule.
Going the other way
To turn 0.015625 back into a fraction, pick the precision you are working to and multiply. At 1/16: 0.015625 × 16 = 0.25, giving 0 after rounding to the nearest mark. At 1/32: 0.015625 × 32 = 0.5, giving 1/32 after rounding to the nearest mark. At 1/64: 0.015625 × 64 = 1, giving 1/64 exactly.
What is 1/64 as a decimal?
1/64 as a decimal is 0.015625. Divide the numerator by the denominator: 1 ÷ 64 = 0.015625. The division comes out exactly, with no remainder left over.
What is 0.015625 as a fraction?
0.015625 as a fraction is 1/64, in lowest terms.
How many millimetres is 1/64 of an inch?
1/64 of an inch is 0.3969 mm, or 0.03969 cm. An inch has been defined as exactly 25.4 mm since 1959, so this conversion is a definition rather than a measurement — the millimetre value is exact too.
Where is 1/64 on a tape measure?
1/64 is a real mark on a rule: it is the 1/64 mark on a 1/64 rule.