4 weeks by cncdivi

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

We provide Hss End Mill Feeds And Speeds with simple shop formulas, and a full-featured, industry-leading calculator available for free (for a limited time). It?s used daily by thousands of top manufacturers worldwide.

They know what they?re doing and wouldn?t waste time or money if the software didn?t work.

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

It takes just 37 seconds to download and start using G-Wizard. It?s free for 30 days, and you?ll get great feeds and speeds. After that, you can always switch back to our free online calculator.

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

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

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

Hss End Mill Feeds And Speeds

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?

To find the highest Material Removal Rate while maintaining tool life, use our G-Wizard Calculator. If you're using the free calculator, check out the Material Removal Rate Formula.

How to Calculate Feed Rate?

Need to calculate feed rate or create a spreadsheet?

Basic feed rate formulas for milling are simple, but real-world feeds and speeds are more complex. Find all the basic formulas in our free online Feeds and Speeds Course.

More Feeds and Speeds Calculators


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