Practical measurement guide
1/64 Inch to MM and CM
Convert 1/64 inch to decimal inches, centimeters, and millimeters with ruler-position and rounding guidance.
1/64 inch equals 0.015625 decimal inches, 0.039688 cm, and 0.396875 mm.
in
Decimals and fractions work, for example 1.5, 1/2, or 1 1/2.
mm
Try a value
Fractions
0.015625 in = 0.396875 mm
0.015625 in × 25.4 = 0.396875 mm
Decimal inches0.015625 in
Feet + inches0 ft 0.0156 in
Nearest 1/16 inch0"
Fraction inch result
1/64 inch equals 0.015625 inches, 0.039688 cm, and 0.396875 mm.
Calculation method
First divide 1 by 64 to get decimal inches. Then multiply decimal inches by 25.4 for millimeters or by 2.54 for centimeters.
Nearby ruler fractions
| Fraction | Decimal inches | Millimeters |
|---|---|---|
| 1/64 in | 0.015625 | 0.396875 mm |
| 2/64 in | 0.03125 | 0.79375 mm |
Precision note
This page keeps the fraction exact and rounds the metric result only for display. Use 64ths when the tool or ruler supports fine increments; otherwise round to 32nds, 16ths, or 8ths.
Related measurement tools
Frequently asked questions
What is 1/64 inch as a decimal?
1/64 inch is 0.015625 decimal inches.
How many mm is 1/64 inch?
1/64 inch equals 0.396875 millimeters.
Is the fraction simplified?
Yes. This page uses a canonical common ruler fraction and does not publish duplicate simplified equivalents.