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Great news! This page offers two Free Online Speeds and Feeds Calculators.

Explore both HSS Feeds and Speeds with simple shop formulas and a full-featured calculator (free for a limited time) that is the industry leader, trusted by top manufacturers worldwide.

They use this software because it works and saves them time and money.

Why use the simple free calculator when you can try our full-featured G-Wizard Feeds and Speeds Calculator free for 30 days? Get it now.

It takes just 37 seconds to download and start using G-Wizard. It痴 free for 30 days and provides excellent feeds and speeds. After that, you can always return to our free online calculator.

Take advantage of the high-performance model while it痴 free!

Click on the Version of G-Wizard Best Suited to Your Needs:

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

Axial End Mill Speeds And Feeds

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 consider
almost 60 different variables, and we
worked with over 50,000 CNC'ers
like yourself to make sure you'd
have the Best Feeds and Speeds.

Improve My Feeds and Speeds For

cnccookbook customers

How to Calculate Material Removal Rate?

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?

Wondering how to calculate feed rate?? 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.

More Feeds and Speeds Calculators


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