Feed Rate and Speed Calculator

This is a simple online Feeds and Speeds Calculator that uses the classic formulas taught in shop class.

Spindle Speed Calculator

Tool Diameter inches

Surface Speed: SFM (see table below for SFM values)

Spindle Speed: RPM

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


Feed Rate Calculator

Spindle Speed: RPM

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 chiploads! 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!

This simple calculator uses the same formulas taught in shop class since before World War 2.

old school feed rate speeds calculator

Old School Feeds and Speeds...

There are a LOT of things it doesn't account for. Here are just a few:

- Rubbing: If you go too slow it's actually terrible for your tool life because of Rubbing.

- Chip Thinning: Taking light cuts can also be very bad for your tool life.

- Alloys and Conditions: There are tens of thousands of alloys out there in varying degrees of hardness. Feeds and Speeds should be fine tuned to account for this.

- Modern CNC and CAM Software: HIgh speed tool paths, helical interpolation, ramping--there's so much that's different than just spinning handwheels on a Bridgeport Mill or Southbend Lathe.

- Roughing versus Finishing: You want to slant your cut to what you're trying to accomplish.

- Tooling: The homely HSS end mill did it's duty, but now there's carbide, all kinds of coatings, variable flute geometries, and more, so much more. There are many other kinds of cutters too--corner rounders, chamfer tools, taps of various kinds, serrated roughers--hey don't get me started. Each one needs it's own special feeds and speeds.

- Micro-Milling: Are you working with small cutters? Less than 1/8" in diameter? The physics are different down there, and your feeds and speeds should be adjusted to account for that.

- Machine: Your feeds and speeds calculations should be tuned for the needs of your machine--large, small, router, mill, or lathe.

Listen, that's just scratching the surface. The point is, a few simple formulas won't really do it in the modern world.

What did your end mill cost you? $20? $50? More?

What about the part you're working on--what's it worth?

Then there's your time. It has value. Even if you're a hobbyist, because hobbyists never have enough time to finish all the things they'd like to do.

There's help for all this. You need a Modern Feeds and Speeds Calculator, not a free simpleton, but something that will cover all these bases and will save you time and money. And something that's not going to break the bank, even for hobbyists.


You Need G-Wizard
Speeds and Feeds Calculator

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

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

Feeds and Speeds Calculator

Master your Speeds and Feeds the easy way with G-Wizard.

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"I've been asking for this for 30 years from the CAM guys. This program is the 'go-to' source for feeds and speeds" Ed

How much do you spend on cutters in a year? If each one lasted 56% longer, you'd save 56% of that. Plus what's the value of your time saved and time saved on jobs?

G-Wizard pays for itself very quickly--you'll see in the 30-day Free Trial.


G-Wizard Speeds and Feeds Calculator

Mill Features:


Get Speeds and Feeds in seconds

Getting good Speeds and Feeds is quick and easy: Fill in the blanks left to right, top to bottom and
G-Wizard instantly returns the best
Speeds and Feeds. Super simple for Beginners, powerful and flexible for Pros. Plus, the best training materials anywhere free with the product.

Feeds and Speeds Calculator


Feeds and Speeds Calculator

Figure the Best Cut Width and Cut Depth

How do you know when you've got the best Cut Depth and Cut Width? These two parameters matter more than almost any other for best Speeds and Feeds.

G-Wizard will find the best combination to keep tool deflection under control while maximizing Material Removal Rate. No other software can.


Adjusts to Your Needs

Are you looking to maximize tool life or material removal rates? Do you have a small CNC machine or a big industrial machine? Are you trying to hog out a bunch of chips or achieve the best possible surface finish?

G-Wizard makes it easy to dial in exactly
the results you are looking for.

Feeds and Speeds Calculator


Feeds and Speeds Calculator

CADCAM Wizards: An Expert in the Box

How often do you get to experiment with hundreds of different feed and speed combinations to find the best one for your job?

CADCAM Wizards will do that for you automatically in a matter of seconds and without asking too many questions. It's like having a machining expert sitting at your shoulder telling you the right combination for the win--another G-Wizard first!


Extensive Tool Crib & Tool Coverage

G-Wizard Calculator handles more different kinds of tooling than any other Speeds and Feeds Calculator.

Import and Export tables from CSV files, use Manufacturer's Recommended Data, define tool geometry, and use dozens of tool types for Mills, Routers (special router cutters handled) and Lathes.

Speeds and Feeds Calculator


Geometry, Threads and More

Why leaf through old-style handbooks when you can have interactive calculators at your fingertips?

Bolt Circles, Trig, Chords, Thread Database, Fastener Dimensions, and much more. There's even a Turner's Cube calculator!

G-Wizard isn't just Speeds and Feeds, it has the most comprehensive reference resources available in any software package.

G-Wizard works for Mills, Lathes, and Routers.

Learn what G-Wizard Speeds and Feeds Calculator can do for you

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Screenshots, feature descriptions, and more

"I'm in my 27th year and seen my share of 'machinist aid' software and this BY FAR packs the most punch for the dollar. Shop owners would be fools not having a copy." Michael

"I'm a total Newbie on hobby mill and had the crazy idea to jump right in on some plasma cut hardened steel. WOW! I did it and could not have done it without G-Wizard. I completed our very first EVER customer part in about 1 hour." Jeffrey

"I am amazed at all the data that is available when using the G-Wizard. I've been in the business for 43 years and sure wish something like this was around back in the day." Michael

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