Set Up Feeds & Speeds
Start with the tool diameter and cutting speed, then enter flute count and chip load. Add radial and axial engagement when you need material removal rate. Keep the unit set consistent across the inputs.
Speeds and Feeds Calculator
Calculate spindle speed, feed rate, chip load, surface speed, and material removal rate for CNC machining.
Metrik MFG / Feeds & SpeedsREADY
Speeds and Feeds Calculator
INPUTVALUEOUTPUT
Primary input01
Process setting02
Calculated output03
CALCULATION STATUSREADY TO CALCULATEEnter values below to generate results
STANDARD MODE
READY TO CALCULATE
Speeds and Feeds Calculator
Advanced Engineering
PRACTICAL CONTEXT
Using the result in real shop work
Use this calculator to turn the main milling inputs into practical cutting values. Enter the tool diameter, flute count, cutting speed, chip load, and cut dimensions, then review the calculated spindle speed, feed rate, and material removal rate.
Where This Result Helps
Use the result when setting up a milling operation, checking a shop calculation, estimating cycle conditions, or comparing two cutting strategies before running a job.
What Can Distort the Result
Mixing inches and millimeters, entering the wrong tool diameter, using an unrealistic chip load, or calculating MRR without the actual width and depth of cut.
ENGINEERING METHOD
How the feeds & speeds calculation works.
FORMULARPM = 3.82 × SFM ÷ tool diameter. Feed rate = RPM × flutes × chip load. MRR = feed rate × radial engagement × axial depth.
RELATED CALCULATIONS
Related Engineering Calculations
Continue with connected machining, production, geometry, and shop calculations.
MANUFACTURING KNOWLEDGE
Related Guides & Articles
Practical information connected to machining, production, materials, tooling, and shop work.
GUIDE / ARTICLE
Why Unit Consistency Matters in Shop Calculations
Mixing inches, millimeters, SFM, RPM, and other unit families is one of the fastest ways to get a believable but wrong result.
GUIDE / ARTICLEBolt Circle Coordinates for CNC Drilling
Generate and verify bolt-circle X and Y coordinates before using a drilling pattern in a CNC program.
GUIDE / ARTICLESurface Finish and Feed Per Tooth
See how theoretical milling roughness changes as feed per tooth and tool diameter change.
GUIDE / ARTICLETap Drill Size: A Practical Starting Calculation
Use the common metric and inch starting relationships for tap-drill selection, then verify against the actual thread standard.
GUIDE / ARTICLEWhat Goes Into a CNC Machine Hourly Rate
Understand the difference between a simple machine rate and a rate that reflects real operating cost.
GUIDE / ARTICLECNC Machining Time: Cycle Time, Setup, and Job Planning
Turn cycle time into a realistic job duration by including setup time and a measured downtime allowance.
GUIDE / ARTICLEHow to Use Tool Life Data Without Guessing
A practical introduction to the Taylor tool-life equation and why its constants must come from real cutting data.
GUIDE / ARTICLEHow to Estimate Material Removal Rate
Learn the simple MRR relationship between feed rate, width of cut, and depth of cut.
GUIDE / ARTICLEFeed Rate vs Chip Load: The CNC Milling Relationship
See how spindle speed, flute count, and chip load combine to produce a milling feed rate.
GUIDE / ARTICLEHow to Calculate CNC Spindle Speed From SFM
A practical explanation of the spindle-speed formula and the inputs that matter before setting CNC RPM.