Material removal rate (MRR) is the volume of metal cut per minute. It measures how productive a cut is and feeds directly into spindle horsepower.
MRR = WOC × DOC × Feed (IPM)
What the variables mean
| Symbol | Meaning |
|---|---|
| MRR | Material removal rate (in³/min) |
| WOC | Width of cut / radial engagement (inches) |
| DOC | Depth of cut / axial engagement (inches) |
| Feed | Feed rate (inches per minute) |
Worked example
A 0.25 in wide, 0.5 in deep cut at 30 IPM: MRR = 0.25 × 0.5 × 30 = 3.75 in³/min.
Skip the arithmetic with the MRR Calculator in Feeds & Speeds.