Material Removal Rate Calculator

MRR is the direct product of axial depth, radial width, and feed rate -- depth (in) x width (in) x feed (in/min) gives cubic inches per minute. Because it's a straight product with no other terms, doubling any ONE of the three factors while holding the others fixed exactly doubles MRR, regardless of which factor you choose.

Different materials resist cutting by very different amounts -- steel takes roughly four times as much specific cutting energy as aluminum to remove the same volume, which is why this calculator applies a much higher "unit power" constant (about 1.0 hp per in^3/min for steel vs. about 0.25 for aluminum) to reach the required horsepower for a given MRR.

Reduce axial depth of cut, radial width of cut, or feed rate -- any one reduction lowers MRR proportionally, which lowers required horsepower by the same proportion. In practice, machinists usually reduce depth of cut or width of cut first, since feed rate also affects surface finish and tool wear.

Yes, in THIS calculator's model -- axial depth and radial width both enter the MRR formula identically, as plain multipliers with no other terms attached, so widening the cut by some fraction lifts MRR (and required horsepower) by that identical fraction, exactly as deepening the cut by the same fraction would. In practice, radial engagement also changes chip thinning and the tool's engagement angle, which is why real-world high-speed-machining strategies often trade a low radial width for a higher axial depth at the same MRR rather than treating the two as truly interchangeable.