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Machinist Calc Pro
Model 4087
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Price: $69.95 Add to Cart
48 cont. states only

[+] Overview

Advanced Machining
Math and Reference Tool

Click here for our International model

Ideal for machining pros and shop owners who want to increase productivity and profits in the design, layout and set-up stages of production and reduce wear and tear on costly cutting tools.

The Machinist Calc Pro is the first dedicated handheld machining math and reference tool to provide a complete assortment of machine shop solutions. It has more complete Thread data than the Machinery's Handbook, including step-saving Thread and Drill Size chart look-ups, speeds and feeds, right triangle solutions, bolt patterns and much more.

Spend more time machining and less time looking up specs and data in books, on charts or in computer programs.

Includes a rugged shock, dust and moisture resistant Armadillo Gear protective case.

Built-in Functions and Calculations:
  • Speeds and Feeds calculate for milling, turning and drilling; cutting speed, spindle speed (RPM), feed rate (IPM), cutting feed, feed per tooth/chip load, number of Teeth and Radial Chip Thinning adjustment factor
  • Built-in Drill and Thread Size Tables - save time and steps (Compliant with ANSI/ASME B1.1-2003 and ANSI/ASME B1.13M-2005)
  • Enter Numeric, Fractional, Metric Thread Sizes and Drill Sizes - and display tap, roll tap, close and free fit drill sizes plus pitch, major and minor diameters
  • Right Triangle Math - plus trig functions
  • Drill Points - enter the cutting angle and drill size to calculate the drill point cut depth
  • Bolt Pattern Hole Layouts - enter start angle, number of bolts, diameter and optional x, y offset; calculate x and y coordinates. Find center-to-center spacing for bolt pattern layouts
  • 3-Wire Measure - enter Wire Size (or use calculated Best Wire size) and 3-Wire Measurement to calculate pitch diameter
For efficiency-minded Machinists, Setters, Tool and Die Makers, Supervisors, Shop Owners

[+] Details

Dedicated Functions:

  • Speeds and Feeds - Calculate for Milling, Turning and Drilling; Spindle Speed (RPM), Feed Rate (IPM), Cut Speed, Cut Feed, Feed per Tooth, Number of Teeth and Radial Chip Thinning adjustment factor
  • Thread Size - Enter numeric, fractional or metric thread sizes and display tap, roll tap, close and free fit drill sizes. Display pitch, major and minor diameters
  • Drill Point - Enter the cutting angle and Drill Size and calculate the Drill Point cut depth
  • Drill Size - Enter numeric, letter, fractional or metric Drill Size and display the closest fitting Drill Size and scroll through available drill sizes
  • 3-Wire Measure - Enter Wire Size (or use calculated Best Wire size) and 3-Wire Measurement to calculate pitch diameter
  • Trig Functions - Sine, Cosine, Tangent, Arcsine, Arccosine, Arctangent
  • Right Triangle Math - Enter, calculate Angle, Hypotenuse, Opposite and Adjacent side lengths

Additional Features:

  • Thread Classification Tables
    • U.S. Internal (3) 1B, 2B, 3B
      • External (3) 1A, 2A, 3A
    • Metric Internal (14) 3G-9G and 3H-9H
      • External (28) 3g-9g, 3h-9h, 3e-9e, 3f-9f
  • U.S. and Metric Unit Entries and Conversions
    • Decimal Inches/mils
    • Feet-Inch-Fractions
    • m, mm, cm
    • Area, Volume and Weight
  • Works as a Standard Calculator


  • Rugged, shock-, moisture- and dust-resistant Armadillo Gear case
  • Quick Reference Guide and complete, easy-to-follow User Guide
  • Two 1.5 volt LR-44/A76 long-life batteries
  • One-Year Warranty

[+] Reviews
Overall Rating Full StarFull StarFull StarFull StarFull Star
4.86 out of 5 
User Reviews
A Machinist for 30 Years 5 out of 5.0
User: , CNC Machinist/Toolmaker of PCC Aerostructures from Arlington, TX
User Rating: ★ ★ ★ ★ ★
Love this calculator!
Us old-schoolers have trig books, various feed/speed sliders from tool companies, etc.
This calculator takes my volumes of notes and notebooks out of my toolbox!

0 out of 5.0
User Rating:
I have only had my 4087 calc. a couple of days and it surpassed every thing I expected it to be. manual is clear ,is completely accurate, and is the best investment I have made in quite some time, every machinist should have one!!

IMTS 5 out of 5.0
User: , lead machinist of ATI from Pacific MO.
User Rating: ★ ★ ★ ★ ★
I had the chance to handle one of these at IMTS 2014 on Tues. It is still my favorite calculator. I am currently using the machinist calc pro and I can't wait to get a pro2.

Extremely useful resource 5 out of 5.0
User: , Tool Maker, Tool Designer from Chattanooga, TN
User Rating: ★ ★ ★ ★ ★
I design tools for a major corporation. I use this calculator every day. Once you learn all the tricks, calculations are a breeze. Recommended for all tool makers, machinists, and apprentices.

Pays for its self 5 out of 5.0
User: , machinst from Spokane, Wa
User Rating: ★ ★ ★ ★ ★
I will say this is the best set-up calulator on the market today. 25 years as a machinist,The Machinist Calc Pro has paid for itself in the first week . NO KIDDING

Does its job well 4 out of 5.0
User: , Machinist of Taylor Machine, Inc. from Blaine, MN
User Rating: ★ ★ ★ ★
Good product for professional machinists alike.

Excellent Tool 5 out of 5.0
User: , Student Machinist from Charlotte, NC
User Rating: ★ ★ ★ ★ ★
As a machining student this tool has been invaluable with helping a rookie with all my calculations!

Machinist Calc Pro 4 out of 5.0
User: from Jeffersonville, IN
User Rating: ★ ★ ★ ★
This Calculator is extremely useful and user friendly. I purchased a total of 8 for our Toolmakers and most have had the trade for 25 + years and are impressed and continually use the calculators.

Very nice 5 out of 5.0
User: , CNC Operator of Flowserve from Etten Leur
User Rating: ★ ★ ★ ★ ★
Very nice product, and need every time to work. Thank you so much

5 out of 5.0
User: , HTEC Director of Vincennes University from Vincennes, Indiana
User Rating: ★ ★ ★ ★ ★
I have found the Machinist Calc Pro to be an ideal calculator for the machinist on the shop floor. In a matter of seconds I can easily do everything from calculate speeds and feeds data and determine tap drill sizes, to working trig problems. And jumping between inch and metric is a breeze. It is also ideal for CNC programming, so I encourage everyone that I train to add this calculator to their tool box in order to save time and be more productive.

Superb Product 5 out of 5.0
User: of CNC Machinist Software from Houston, TX
User Rating: ★ ★ ★ ★ ★
As someone who develops software for a living and has written Machinist Calculator Applications for mobile devices, this unit is simply awesome.

Awesome 5 out of 5.0
User: , Journeyman Machinist of HMF from Manitowoc, Wisconsin
User Rating: ★ ★ ★ ★ ★
No more carrying around Machinist Hand book and other charts! This calculator does everything! Makes everything else seem like a 30 year old calculator! Wish I would have had one 20 years ago! Even comes with a great case!Thanks again CI!

Great Tool! 5 out of 5.0
User: , Quality of TRI-V Tool & Mfg. Co. from Omaha, NE.
User Rating: ★ ★ ★ ★ ★
Has functions that our Machinist Handbook does in the Machinist Pro calculator.

5 out of 5.0
User: , machinist from Pampa, Texas
User Rating: ★ ★ ★ ★ ★

Machinist Calc Pro 5 out of 5.0
User: , Journeyman Tool and Die Maker from Frankfort, Ky.
User Rating: ★ ★ ★ ★ ★
I have been a Journeyman Tool and Die Maker for 10yrs. This calculator has most of the calculations you need on a daily basis. Now I don't have to look up charts or do trig. formulas. I wish I had this 10yrs ago.

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[+] Parts & Accessories
Armadillo Gear Soft Tool Belt Case - Lime Green Armadillo Gear Soft Tool Belt Case - Lime Green

High visibility green tool belt case large enough to hold and protect
Armadillo Gear Soft Tool Belt Case - Lime Green | Add to Cart
LR44 Battery LR44 Battery
( uses 2)

The LR44 battery is equivalent to the Duracell® 303/357 battery.
LR44 Battery | Add to Cart

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