EveryCalc
Reference Sheets
Millimeters
Inches
Drill Size Chart
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Number (#1–#80), letter (A–Z), fractional (1/64–1") and metric (0.5–10 mm by 0.1, 10–13 mm by 0.5) drills, sorted by size.
Drilled holes typically run 0.03–0.1 mm (0.001–0.004") oversize; ream when the size matters.