Free CNC Speeds and Feeds Calculator

Free CNC Speeds and Feeds Calculator

Awesome! You’ve found not one but two Free Online Speeds and Feeds Calculators on this page.

We offer both a 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 the simple free calculator when you could grab our full-featured G-Wizard Feeds and Speeds Calculator completely free for 30-days?

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.

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


Get the High-Performance Model: G-Wizard, Free for 30 Days

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

Milling Speed and Feeds Calculator

Spindle Speed Calculator

Tool Diameter

Surface Speed / Cutting 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 * SurfaceSpeed) / (PI * CutterDiameter)

Feed Rate Calculator

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
Wood - Hardwood (For more wood see linked article) 500
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.

CNC Feeds and SPeeds Chart Wood

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:

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

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

Improve My Feeds and Speeds For

cnccookbook customers

How to Calculate Material Remove Rate for Milling?

Generally, you want to find the highest Material Removal Rate that will keep reasonable tool life.  Our G-Wizard Calculator automates much of that process.  But, if you are using the free calculator above, you may want to click through this article to find the Material Removal Rate Formula.

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.