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Request A ToolBasic Material Removal Rate Calculator
Estimate milling material removal rate from feed, radial width and axial depth. This quantity helps compare the volume removed by two cutting strategies under the stated engagement assumptions. Keep the width, depth and units with the number. The result describes volume per minute under the entered engagement assumptions, not the machine power needed to sustain it.
Used For
Check linear feed, radial width and axial depth of cut.
Formula
Milling MRR = feed rate × radial width × axial depth.
Mrr Basic
Enter the values you know. The result is calculated in your browser.
Calculation only. Verify toolmaker data, material grade, engagement, machine limits, workholding and actual cutting conditions before production.
Advanced Material Removal Rate Calculator
Review the additional variables shown in this tool.
Mrr
Enter the values you know. The result is calculated in your browser.
Calculation only. Verify toolmaker data, material grade, engagement, machine limits, workholding and actual cutting conditions before production.
Estimate A Milling Removal Volume
- Enter linear feed, actual engaged width and axial depth in the selected unit system.
- Calculate volume per minute. Metric mode also shows the conversion to cubic centimetres per minute.
- For the advanced estimate, add cutting distance and passes. Keep air moves and changing engagement outside the constant-section model.
Formula And Units
Milling MRR = feed rate × radial width × axial depth.
Illustrative Calculation
At 1,000 mm/min feed, 5 mm width and 2 mm depth, the estimate is 10,000 mm³/min, or 10 cm³/min. Dividing cubic millimetres by 1,000 converts to cubic centimetres.
Use The Actual Engaged Width
The relationship assumes the entered section is removed along the cutting path. Entry, exit, air cutting, corners and changing engagement mean an instantaneous estimate may differ from average removal across a complete cycle.
MRR Does Not Predict Available Power
Two cuts with the same MRR can have different loads and stability. This tool does not model specific cutting force, spindle power, torque, tool deflection or chip evacuation. Use the separate turning MRR tool for its feed convention.
Check the formula reference or report a result that does not match your calculation.
Calculation Process With Example Values
Illustrative arithmetic only. Select cutting inputs from the applicable tool and material reference.
| Step | Substitution | Result |
|---|---|---|
| Milling Removal Volume | 1,000 × 5 × 2 | 10,000 mm³/min |
| Convert Volume Units | 10,000 ÷ 1000 | 10 cm³/min |
Separate Instantaneous Rate From Cycle Average
Feed × width × depth assumes a constant removed cross-section along the path. Entries, corners and air cutting can make the cycle average lower. The MRR article explains why a volume rate does not establish available spindle power or complete cycle time.
Formula reference: Sandvik Coromant milling formulas and definitions. Use the exact tool supplier for recommended cutting values.
Applications And Related Calculation Workflows
CNC Milling MRR And Turning Volume
The milling MRR calculation uses programmed linear feed multiplied by radial width and axial depth. With millimetres and minutes, the product is cubic millimetres per minute; divide by 1000 for cubic centimetres per minute. A CNC MRR comparison is meaningful only when the operation and engagement assumptions match. Use the turning MRR calculator for the surface-speed and feed-per-revolution convention.
Estimate Cutting Power And Torque
Removal volume alone does not say how much power a cut requires. This estimate combines MRR with an applicable specific cutting force, then relates net cutting power to torque at actual spindle RPM. The force value must come from an appropriate tooling or engineering source; no broad material constant is preselected.
Inputs And Scope
Enter the MRR from the calculation above, a documented effective kc value, actual RPM and an assumed mechanical efficiency. kc stays in N/mm² in both unit modes. The imperial MRR input is converted internally before power is calculated, so pressure units are not silently changed.
Power And Torque Relationships
With MRR in mm³/min, net power Pc = MRR × kc ÷ 60,000,000 in kW. Torque = Pc × 30,000 ÷ (π × RPM) in N·m. Upstream mechanical power = Pc ÷ efficiency, where efficiency is the entered percentage divided by 100.
Illustrative Check
An assumed MRR of 30,000 mm³/min and kc of 2,000 N/mm² give 1 kW of net cutting power. At 6,000 RPM, the torque is approximately 1.592 N·m. An assumed 80% mechanical efficiency changes upstream mechanical power to 1.25 kW; it does not change the net cutting torque.
Cutting Power And Torque Estimate
Enter the values you know. The result is calculated in your browser.
Calculation only. Verify toolmaker data, material grade, engagement, machine limits, workholding and actual cutting conditions before production.
Compare With Capacity At The Actual RPM
Compare the estimate with the machine’s available power and torque at the selected speed, not just a nameplate maximum. The model does not include transient loads, spindle acceleration, tool wear, chatter or electrical auxiliaries. A 100% efficiency entry represents an ideal loss-free mechanical path; the upstream result is not measured electrical consumption.
Sandvik Coromant’s milling definitions provide the net-power and torque relationships. The supplied kc must fit the material, chip thickness and tool context. Use the MRR explanation to review volume units and the source directory to keep material identification separate from cutting-data selection.
Milling MRR Questions
Why Are Two Metric Removal Rates Shown?
They are the same volume rate in mm³/min and cm³/min. Divide cubic millimetres by 1000 to obtain cubic centimetres.
Can I Use This Width And Depth Model For Turning?
Use the turning MRR calculator instead. It uses surface speed, radial depth and feed per revolution rather than milling engagement.
Help Improve This Resource
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Report An ErrorCNC Feeds & Speeds Editorial Desk
The site brings calculation tools and machining references into one workspace. Use the editorial and site information to understand its purpose and limitations. Send corrections with a reproducible example through the error report form.
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