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CNC Calculators and Reference Charts

Easier than searching through Machinery's Handbook! This section contains valuable free calculators and information for CNC'ers. Just click through below to each specific section.


Bolt Circle Calculator G-Codes and M-Codes Sheet Metal Wire Gauge
CNC Feeds & Speeds GD&T Symbols Steel Sizes
CNC Machine Hourly Rate Hardness Conversion Surface Finish Charts
Drill & Tap Sizes Lumber Sizes Tap Speeds and Feeds Calculator
Feed Rate Calculator Polar to Rectangular Calculator Vacuum Table Parts Pop-Off



Bolt Circle Calculator: Generate the coordinates for a bolt circle quickly and easily with this handy free calculator.


cnc feeds and speeds calculator

CNC Feeds and Speeds Calculator: Get the industry-leading Feeds and Speeds Calculator used by thousands of the best manufacturers in the world and improve your tool life, cycle times, and surface finish today.


cnc machine hourly rate calculator

CNC Machine Hourly Rate Calculator: Figure out what hourly rate to charge for your CNC machines.


Thread Strength

Drill Bit Tap and Size Chart and Calculator: A full drill index, recommended tap drill sizes, thread percentages vs strength, free calculator, and more!


Feed Rate Calculator

Feed Rate Calculator: A quick free calculator for feed rates when milling.



GCode and MCode Reference: Need a handy reference chart for all the GCodes?. Look no further. There are charts for Milling GCodes and Turning GCodes. And, there are Tutorials and Sample data from our Free GCode Tutorial too!


GD&T Symbols

GD&T Symbols: Geometric Dimensioning and Tolerancing Symbols in a convenient chart with tutorial information on the symbols from our Free GD&T Course.


Hardness Conversion Charts, Calculator, and information for Rockwell, Vickers, Brinell, Shore Scleroscope, and more Hardness Scales.

Hardness Conversion Charts: Hardness Conversion Charts, Free Calculator, and information for Rockwell, Vickers, Brinell, Shore Scleroscope, and more Hardness Scales.


Lumber Sizes Chart

Lumber Sizes: Ever notice a 2 x 4 doesn't measure 2 by 4 inches? Here's the scoop on the actual sizes for lumber, despite what we call it. There's even a free calculator for weights and volumes based on the actual sizes.


polar to rectangular calculator

Polar to Rectangular Calculator: Convert from Polar to Rectangular (Cartesian) Coordinates easily.


sheet metal weight gauge calculator

Sheet Metal Wire Gauge Sizes Chart / Table and Calculator: Sheet metal gauging is somewhat arbitrary, but we've got full reference charts plus a nifty free calculator to help right here.


Steel I Beam, Channel, Angle, HSS Sizes

Steel I-Beam, Channel, and Angle Sizes: Complete Guide to Standard Sizes for Steel I-Beams, HSS, Channel, and Angle.



Surface Finish Chart Tables: Complete Guide to Surface Finish Charts, RA, RZ, Measurements, Callouts and Symbols.


Tap Feeds and Speeds Calculator

Tap Speeds and Feeds Calculator: Quick Calculator for tapping feeds and speeds.


Vacuum Table Pop-Off Calculator

Vacuum Table Pop-Off Calculator: Quit scrapping parts because they pop off your vacuum table.


When All Else Fails:



Yup, it's true, you got this far and didn't find the information you were looking for. Happens to the best of us. When all else fails, I always turn to Machinery's Handbook to look for information.

One more sneaky trick: buy one or two editions back--not the latest. Most of the info hardly changes and you'll save a bundle!





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2 Tools for Calculating Cut Depth and Stepover

CNC Machine Hourly Rate Calculator

Special Purpose CNC Calculators

Feeds and Speeds Guide

CNC Cutter Guide

Feeds and Speeds By Material

G-Code Tutorial

  Feed Rate Calculator

Sales, and Special Deals


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