Type any value below for an instant, exact conversion — decimal and nearest fraction included. Built for engineering, sewing, jewelry, and hardware work where the last decimal place matters.
25/64" nearest 1/64 fraction · formula: mm ÷ 25.4 = in
inches = mm ÷ 25.4
mm = inches × 25.4
1 inch defined as exactly 25.4mm — 1959 international yard & pound agreement
Common values, decimal & nearest fraction. Every row links to a full breakdown.
| Millimeters | Inches (decimal) | Nearest fraction |
|---|
Tape measures and drill bits are marked in 1/16" or 1/64" increments, not decimals. Use this table to read off the mark you'll actually find on the tool.
1.5875 mm
1/16"
3.175 mm
1/8"
6.35 mm
1/4"
9.525 mm
3/8"
12.7 mm
1/2"
15.875 mm
5/8"
19.05 mm
3/4"
25.4 mm
1"
Verify drawing dimensions when switching between metric and imperial unit settings. Results to 5 decimal places.
Convert pattern measurements to the inch marks on a US tape measure or ruler, fraction-accurate.
Cross-check metric bolt and socket sizes against SAE wrenches before you're stuck under the car.