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Tap Drill Size Calculator
Decision Tools
Tap Drill Size Calculator
Free engineering calculator - no signup, runs in your browser.
DEW Machine Shop Tools
Tap Drill Size Calculator
Inputs
Thread Standard
Inch (UNC/UNF)
Metric (ISO)
Thread Size
Thread Engagement (%)
100% (max strength, hard to tap)
75% (standard, recommended)
65% (easier tapping)
50% (soft materials only)
75% is the standard recommendation for most materials
CALCULATE
Readout
TAP DRILL SIZE
—
NEAREST STOCK DRILL
—
THREAD SPEC
—
Estimates based on standard tap drill chart formulas. Verify against your shop's tap drill chart before production runs.
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