Core equation
RPM = speed factor × cutting speed / diameter; Feed = RPM × feed/revInputs are normalized before calculation and converted back to the selected output units.
Machining / interactive calculator
Drilling Speed & Feed Calculator
Calculate drilling spindle RPM and penetration feed from drill diameter, cutting speed, and feed per revolution.
length
Nominal or effective drill diameter.
speed
Surface speed at the drill diameter.
fpr
Advance for each spindle revolution.
Formula & assumptions
How the calculation works
Production check
Confirm the starting values for drill material, work material, point geometry, coolant, hole depth, runout, and chip evacuation.
Production application disclaimerEducational planning estimate. Verify the result against current tooling data, material condition, machine limits, workholding, inspection requirements, and qualified personnel before production.
Last reviewed: September 4, 2026 · Formula and metric/imperial conversion checks completed.