FSWizard - Free Speed and Feed Calculator for iOS, Android, and Browser

The Speed and Feed calculator allows machinists and programmers calculate cutting parameters for multiple materials and cutting tool types.

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FSWizard Speed and Feed Calculator

This free speed and feed calculator allows CNC Machinists and Programmers to calculate cutting parameters for a wide variety of materials and tools.

Key features of FSWizard Machinist Calculator

  • Built-in material and tool database (Check here for a list of materials available in the PRO version: Supported Materials)
  • Materials ranging from Mild and tool steels to Stainless, Aluminum, and Plastics
  • Speeds and Feeds all kinds of Machining operations. Supports Milling, Drilling, Tapping, and Turning tools
  • Drilling Speed and Feed Calculator
  • Milling Speed and Feed Calculator
  • Turning and Tapping Speed and Feed Calculator
  • Calculate Cutting Speed (SFM), Chip-Load (ipt), RPM, and Feed-Rate.
  • Calculate required Machining Power
  • Calculate optimal Depth and Width of Cut
  • Calculate Chip Thinning and HSM(High-Speed Machining)
  • Multiple free geometry calculators and reference charts under the MENU button
  • Reference data for FHS, SHCS, Heli-Coil, Pipe Taps, Scientific Calculator, Bolt Hole, etc...

How to calculate speeds and feeds using FSWizard Machinist Calculator

  1. Click on the Material button to select the work material
  2. Select the Tool Type drop-down to pick a proper tool for the job.
    Milling, Drilling, Tapping, and Turning tools are supported
  3. Then enter proper tool geometry and cutter engagement.
  4. Your results are displayed on the blue toolbar
  5. Click on the toolbar to get more insights about your cutting data.
  6. MENU button gives access to additional calculators and reference data!

Please post your questions and suggestions on our support forums!

Machining Formulas

General Speeds and Feeds Formulas

Free Online Speed and Feed Calculators


Imperial Speed and Feed Calculator

RPM= 12 x SFM = Please enter Speed and Diameter
3.14 x in

Feed Rate = RPM x x in = Please enter RPM, number of teeth and chip load (in/min)


Metric Speed and Feed Calculator

RPM= 1000 x M/min = Please enter Speed and Diameter
3.14 x mm

Feed Rate = RPM x x mm = Please enter RPM, number of teeth and chip load (mm/min)

Want something better?

Try our desktop  HSMAdvisor Speed and Feed Calc or Mobile/Online FSWizard

More about formulas needed to calculate turning, drilling, and of course milling speeds and feeds

Here are a few basic formulas with term explanations to get you going: 

Calculating Spindle Speed (RPM) Using Imperial Cutting Speed:


RPM= 12 x SFM
3.14 x Diameter

Simplified imperial formula:

RPM= 3.8 x SFM

Calculating Spindle Speed (RPM) using Metric Cutting Speed:


RPM= 1000 x SMM
3.14 x Diameter

Simplified metric formula:

RPM= 318 x SMM

Calculating Feed Rate :

Feed_Rate=RPM x N(teeth) x CL(chip load)


  • RPM = Revolutions Per Minute, Spindle Speed, Number of revolutions of spindle per minute
  • SFM = Imperial. Surface Feet Per minute, Cutting speed, Speed at which tip of tool travels through material
  • SMM= Metric. Surface Meters Per minute, Cutting speed, Speed at which tip of tool travels through material
  • Feed_Rate = Inches Per Minute or Millimeters Per Minute, Feed Rate, Distance in inches or millimeters the tool the will travel through workpiece per minute.
  • N = Number of teeth on the cutter
  • CL= Chip Load per tooth, This is the advancement of the cutter per revolution per each cutting edge. Otherwise generally explained as the thickness of material each tooth takes per each revolution


Calculate Speeds and Feeds for 1/2" (0.5 in) 2 flute end mill in Mild Steel at cutting speed = 100(ft/min), Chip Load=0.001(inch per tooth)

Calculating Spindle Speed (RPM):


RPM= 12 x SFM
3.14 x Diameter


RPM= 12 x 100(ft/min) =764(revs/min-1)
3.14 x 0.5(in)

For turning applications, we do not need this formula since Spindle Speed is usually given in Constant Surface Speed (CSS), which uses SFM value directly. But if you still want to use the RPM formula, then the diameter value is the actual diameter of the workpiece.

Calculating Feed Rate in Inches Per Minute (IPM)

The formula is used for milling and drilling applications. Please note that some tool manufacturers provide their recommended feed rate as feed per revolution. In such cases do not multiply by the number of teeth.


Feed Rate = RPM x N x CL

Feed Rate = 800(RPM) x 2(teeth) x  0.001("chip load) =1.600 (in/min)

Easily Calculating Speeds and Feeds on your smartphone or computer

Our own free Speed and Feed Calculator can help you calculate cutting parameters for many different material groups.

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