Machinist Calculators
A set of quick shop-floor tools — speeds & feeds, tap drill sizes, true position, and more.
Speeds & Feeds
Calculate spindle speed (RPM) and feed rate (IPM) from surface footage and tooling.
Tap Drill Sizes
Recommended drill size for common thread sizes (cut or form taps).
Reference values. Always verify against your thread spec, material, and class of fit.
Drill Size Finder
Find the nearest drill — enter a decimal, fraction, wire/letter, or metric size.
True Position
Diametrical true position from X/Y deviation, with optional MMC bonus tolerance.
Countersink Depth
Z-depth to the tip for a given countersink diameter and included angle.
Countersink Z-Offset
Z adjustment to correct a countersink from a measured to a target diameter.
Drill Point Depth
Drill tip length, plus optional full-diameter depth to the target shoulder.
Sine Plate / Sine Bar
Gauge block stack height to set a sine bar or sine plate to a given angle.
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