# 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?

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:

• ### CNC Mill Feeds and Speeds Calculator

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

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

## Milling Speed and Feeds Calculator

### Spindle Speed Calculator

Tool Diameter
>
inches

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:
>
RPM

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

### Feed Rate Calculator

Spindle Speed:
>
RPM

>
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 Material 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 Need a Material Not Listed? We Can Help!
 Drilling Surface Speeds for HSS Twist Drills Material 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 Need a Material Not Listed? We Can Help!
 Milling Chiploads for HSS End Mills Material 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

## 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.