Drill Feed Calculator

DRILLING

Drill feed rate converts spindle RPM and the recommended feed per revolution for a given drill diameter into the linear feed rate (IPM) programmed on the machine.

Feed Rate (IPM)—
Feed Rate = RPM × Feed per Revolution.

How it works

Drills feed per revolution rather than per tooth, since both flutes engage the material together as the drill rotates and advances. Feed per revolution generally scales with drill diameter; larger drills can take a larger feed per revolution because they have more edge length in contact with the material.

FAQ

What feed per revolution should I use for drilling? As a rough guide, feed per revolution of roughly 1 to 2 percent of drill diameter is a common starting point in steel (about 0.005 to 0.010 in/rev for a 0.5 in drill), adjusted down for harder materials or deep holes and up for softer materials.

Related Guides

CNC Calculators · Drill RPM Calculator · Feed per Revolution Calculator

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The calculators and tools on Formula Factory are provided for general guidance and informational purposes only. Results are estimates based on standard formulas and the values you enter — they do not constitute professional engineering, electrical, or architectural advice. Always verify calculations with a qualified professional before making decisions for any safety-critical, code-compliance, or commercial application. Formula Factory makes no representations or warranties as to the accuracy or completeness of any result, and accepts no liability for errors, omissions, or any outcomes arising from reliance on this information.