Cutting & Tooling Calculators

Cutting & Tooling

Cutting & Tooling Calculators

End mills, drills, taps, boring bars — calculate the right parameters for every tool.

End Mill RPM

RPM = (SFM × 3.82) / Dia

Cutting Speed (SFM)

End Mill Dia (in)

Result

—

RPM

Drill Feed Rate

Feed = RPM × IPR

RPM

Feed/Rev (IPR)

Result

—

IPM

Tap Drill Size

Drill = Major Dia − (1/TPI)

Major Diameter (in)

Threads Per Inch

Result

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Thread Milling Feed

Feed = RPM × CL × Flutes

RPM

Chip Load (in)

Flutes

Result

—

IPM

Boring Bar RPM

RPM = (SFM × 3.82) / Bore Dia

Surface Speed (SFM)

Bore Diameter (in)

Result

—

RPM

Turning Speed

RPM = (SFM × 3.82) / Stock Dia

Surface Speed (SFM)

Stock Diameter (in)

Result

—

RPM

Insert Life Estimate

Life = (SFM_r/SFM_a)³ × Base Life

Rated SFM

Actual SFM

Base Life (min)

Result

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min

Tool Deflection

δ = FL³ / (3EI)

Cutting Force (lbf)

Overhang (in)

Tool Dia (in)

Result

—

Helix/Ramp Angle

Angle = arctan(DOC / FPR)

Depth of Cut (in)

Feed/Rev (in)

Result

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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.