Show Me How to Improve Speeds and Feeds For

Awesome! 2 Free Online Feed Rate Calculators [Mill, Lathe & CNC Router]

Feed Rate and Speed Calculator

You’ve found our simple free online Feeds and Speeds Calculator that uses the classic formulas taught in shop class.  With a calculator, you don’t need to worry about how to calculate feed rate for milling, or the speed (rpms) either.  Just key in the parameters and our calculator will find the answer for you.

We offer both that free online feeds and speeds calculator using simple shop formulas, and also a free (for a limited time) full-featured calculator that is the industry leading speeds and feeds calculator.  It’s used daily by thousands of the world’s best manufacturers.

They know what they’re doing and wouldn’t waste time or money if the software didn’t work.

The thing is, why use that simple free calculator when you could grab our full-featured G-Wizard Feeds and Speeds Calculator completely free for 30-days?

feed rate calculator

How do you lose with that deal?

It takes just 37 seconds to download and start using G-Wizard.  It costs you nothing and you can get great feeds and speeds from it for the next 30 days.  If you want to go back to our free online calculator after that, no worries.

But you may as well drive the high performance model as long as it’s free, right?

G-Wizard Has Features for Each Machine Type

Still not convinced?  Consider that G-Wizard has specific features for each machine type.  In effect, you get 3 Calculators in one:

Click through each of those to see features tailored by machine type.

Or, just use our simple online cutting speeds and feeds calculator below:

Here you can create the content that will be used within the module.

End Mill Speeds and Feeds Calculator

Milling Feeds and Speeds

Spindle Speed Calculator

Tool Diameter

Surface Speed:

SFM (see table below for SFM values).  To learn what is SFM and how to go from SFM to RPM, click this link.

Spindle Speed:

Spindle RPM Formula = (12 * SurfacceSpeed) / (PI * CutterDiameter)

Feed Rate Calculator

Spindle Speed:

Feed/Tooth (Chipload):
IPT (inches / tooth)

Number of Flutes (Teeth):

Feed Rate:

IPM (inches / minute)

Feed Rate Formula = Chipload * NumberFlutes * RPM

Milling Surface Speeds for HSS End Mills
Surface Speed (SFM)
Aluminum - Wrought (6061) 250
Brass 200
Cast Iron - Ductile 90
Cast Iron - Gray 100
Copper Alloy - Wrought 120
Magnesium Alloy 250
Stainless Steel 30
Steel - Mild 110
Steel - Hard Alloy 60
Steel - Tool 60
Drilling Surface Speeds for HSS Twist Drills
Surface Speed (SFM)
Aluminum - Wrought (6061) 250
Brass 200
Cast Iron - Ductile 80
Cast Iron - Gray 120
Copper Alloy - Wrought 70
Magnesium Alloy 250
Stainless Steel 30
Steel - Mild 110
Steel - Hard Alloy 60
Steel - Tool 60
Milling Chiploads for HSS End Mills
Chipload (IPT)
Aluminum - Wrought (6061) 0.005 - 0.010
Brass 0.005 - 0.010
Cast Iron - Ductile 0.004 - 0.008
Cast Iron - Gray 0.002 - 0.006
Copper Alloy - Wrought 0.004 - 0.008
Magnesium Alloy 0.005 - 0.010
Stainless Steel 0.002 - 0.006
Steel - Mild 0.002 - 0.010
Steel - Hard Alloy 0.002 - 0.006
Steel - Tool 0.002 - 0.006

Note: Chipload should be adjusted for tool diameter. Smaller tools tolerate much lower chip loads! You can look this up in the manufacturer's catalog, or we can help.

Not Sure the Correct Value for Your Cutter? We Can Help!

Hang on: You Deserve Better!

Software that makes anyone a better CNC’er…  Even beginners:

It took years, we analyzed data from over 250 tooling catalogs,
we built a powerful cutting physics engine with advanced algorithms
that considers almost 60 different variables,
and we worked with over 50,000 CNC’ers
like yourself to make sure you’d have

Better Tool Life, Surface Finish, and MRR with G-Wizard

Improve My Feeds and Speeds For

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How to Calculate Feed Rate for Milling?

Wondering how to calculate feed rate for milling?  Perhaps so you can create your own spreadsheet?

The basic feed rate formulas for milling are simple, but getting real-world feeds and speeds are quite a bit harder.  We give you all the basic formulas in our free online Feeds and Speeds Course.