Material Removal Rate Calculator (MRR)
MRR (Material Removal Rate) tells you how many cubic millimetres of material a cutting tool removes per minute. Enter the width of cut, depth of cut and feed rate, and optionally the total volume to remove, to get the MRR and machining time.
mm
mm
mm/min
mm³
Volume of material removed per minute
Width of cut
Depth of cut
Feed rate
Apply MRR formula: W × D × F
Material removal rate
- 1
Cross-section area (W × D)
10 × 2 = 20 - 2
Material removal rate (MRR)
20 × 500 = 10,000Width × depth × feed rate gives the volume of material removed per minute.
How does this calculator work?
MRR (mm³/min) = Width of cut × Depth of cut × Feed rate. Machining time = Volume ÷ MRR. Higher MRR means faster material removal but also greater tool wear. Balance with the recommended chip load for your tooling to keep cycle times short without sacrificing tool life.
Formula
How this is calculated
Material Removal Rate is a key productivity metric in machining. For milling it is the product of three cutting parameters: MRR = W × D × F, where W is the radial width of cut (mm), D is the axial depth of cut (mm), and F is the table feed rate (mm/min). The same formula applies to turning (W = depth of cut, D = pass width, F = feed rate) and to drilling in simplified form.
A higher MRR means more metal is removed per unit time, which shortens cycle time but increases cutting forces, heat and tool wear. In practice, machinists balance MRR against tool life — running at 80% of the maximum recommended chip load is a common heuristic to extend tool life while maintaining acceptable throughput.
This calculator uses consistent metric units (mm and mm/min → mm³/min). Divide by 1 000 to convert to cm³/min or by 61 024 to convert to in³/min. The formula assumes a rectangular cut cross-section — actual MRR for non-rectangular toolpaths will differ slightly.
Frequently asked questions
MRR is typically expressed in mm³/min (metric) or in³/min (imperial). This calculator works in mm. To convert: 1 in³/min ≈ 16 387 mm³/min.
Machining time = Volume to remove ÷ MRR. If you need to remove 100 000 mm³ at an MRR of 5 000 mm³/min, the cut takes 20 minutes. This ignores tool-change time, repositioning and non-cutting passes.
Not necessarily. Higher MRR increases cutting forces and heat, accelerating tool wear and risking chatter or breakage. Optimise by increasing feed first (cheapest), then depth of cut, then width — always staying within the tool manufacturer's recommended chip-load range.
Also known as
TG we-Calculate Editorial Team. (2026). Material Removal Rate Calculator (MRR) [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/material-removal-rate-calculator
TG we-Calculate Editorial Team. "Material Removal Rate Calculator (MRR)." TG we-Calculate. 2026. https://we-calculate.com/calculator/material-removal-rate-calculator.
TG we-Calculate Editorial Team, "Material Removal Rate Calculator (MRR)," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/material-removal-rate-calculator
@misc{wecalculate_material_removal_rate_calculator, title = {Material Removal Rate Calculator (MRR)}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/material-removal-rate-calculator}}, year = {2026}, note = {TG we-Calculate} }
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