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Construction Master Pro
Model 4065
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MSRP: $74.95
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[+] Overview

Advanced Construction-Math Calculator

The Construction Master Pro is an award-winning advanced feet-inch-fraction construction-math calculator with powerful built-in solutions perfect for completing layouts, plans, bids and estimates. Calculate circles, roofs, stairs, and more. Works in and converts between feet-inches-fractions and decimals, including metric. Use it in the field or office to save time, reduce costs, prevent re-work and maximize profits.

Construction Calculations:

  • Work in and convert between building dimensions, including Metric
  • Built-in Right-Angle solutions
  • Areas, Volumes, Square-ups
  • Complete Stair Layouts
  • Roof, Rafter and Framing solutions
  • Circle: Arcs, Circumference, Segments
  • Drywall - Siding and Panels
  • Stairs - Riser Height and solve for Stairwell Opening
  • Studs On-center
  • Compound Miter Cuts
  • Arched Rake-Walls

For Contractors, Estimators, Architects, Carpenters, Framers, Draftspersons, Engineers, Builders, Tradespersons

[+] Details

Dimensional Math and Conversions

  • Work in and convert between building dimensional formats: Yards, Feet-Inch-Fractions, Decimal Feet-Inches and Metric - including Area and Volume
  • D:M:S to Decimal Degree conversions
  • Find Weight per Volume

Built-in Time Saving Functions

  • Complete Stair calculations for Risers, Treads, Stringer Length and Incline Angle
  • Set Riser Height and solve for Stairwell Opening
  • Built-in Right-Angle Functions for Square-ups, Slopes and more
  • Area, Volume and Perimeter solutions with Length, Width and Height Keys
  • Drywall, Siding and Paneling Key calculates 4x8, 4x9 or 4x12 Sheets to cover an Area
  • Roof Function finds Area, Bundles, Squares and 4x8 Sheathing for Flat or Pitched Roofs
  • Custom Rafter Function provides Common Rafters, Regular and Irregular Hips, Valleys and Jacks; instant Cutting Angles (Cheek, Level and Plumb)
  • Jack Rafter results for Regular and Irregular Pitch Roof. Find Rake-Wall Studs with On-center spacing
  • Compound Miter - Store Crown Angle and Enter Wall Corner Angle to calculate the Blade Tilt and Angle for Miters cuts
  • Advanced solutions for Circles, Arches, Columns, Cones, Pillars, Windows and Post-holes
  • Arched Rake-Walls with On-center Spacing
  • Studs - Calculate the number of On-center Studs for an entered Length
  • Equal Sided Polygon - Calculate Corner and Bi-sect Angles, Side Length, Perimeter and Area
  • Block and Footing solutions
  • Board Feet Lumber estimating

Additional Features

  • User Preferences: Set custom defined options such as Fractional settings for 1/2" to 1/64" and Stair Headroom Height, Decimal Degrees and more
  • Exponential Notation: Enter and display exponential values
  • Backspace Key: Makes it easy to change just-entered values
  • Constant Operator: Simplifies repetitive calculations
  • Cost per Unit: Easily solve unit costing and pricing
  • Accumulating Memory (M+) - Plus three additional Memory Storage locations
  • Paperless Tape: Review of last 20 entries; double-check totals
  • Standard Calculations: works as a regular math calculator with +, -, +/-, ×, ÷, %, π, 1/x, x2, and √
  • Automatic Shut-Off saves battery life


  • Rugged shock, dust and moisture-resistant Armadillo Gear protective case (Model #5022-4)
  • Pocket Reference Guides in English and Spanish
  • Two LR44 long-life batteries
  • One-year limited warranty

Tech Specs

5.7 x 3.0" x 0.65" (145 mm x 76 mm x 17 mm)

Product Weight:
4.6 oz. (130 gm)
Includes case and Pocket Reference Guide

Two 1.5-volt LR-44/A76 long-life batteries

Display Type:
11 digits (7 normal, 4 fractions)

Display Dimensions:
0.625" x 2.5" (16 mm x 63.5 mm)

12 digit internal accuracy

[+] Reviews
Overall Rating Full StarFull StarFull StarFull StarFull Star
4.94 out of 5 
User Reviews
5 out of 5.0
User: , Owner of Blueline Building Systems, LLC from Bristol, CT
User Rating: ★ ★ ★ ★ ★
This is my third calculator from Calculated Industries and the product keeps getting better over time. The amount of time this saves me both in the office and on the jobsite is worth its weight in gold. If Calculated Industries keeps developing and improving their product line, I will keep upgrading as we continue to grow.

Super Great Product 5 out of 5.0
User: , Quality Assurance Rep of HFS / USACE from Louisiana
User Rating: ★ ★ ★ ★ ★
This little jewel will make you look like a hero, and is easy to use.

Survey 5 out of 5.0
User: , Plant Manager of Felker Brothers Corp. from Marshfield, WI
User Rating: ★ ★ ★ ★ ★
Nice product, returning customer.

All your products 5 out of 5.0
User: from Oak Park, IL
User Rating: ★ ★ ★ ★ ★
I'm a construction guy, my wife is the cook. We both use your products and love them. CM Pro and Pro Master Chef are excellent products

Construction Master Pro 5 out of 5.0
User: , Operations Dir of Stockell Gen Contr Inc from St. Louis, MO
User Rating: ★ ★ ★ ★ ★
Works even better than the Constr Master IV that it replaced.

5 out of 5.0
User: , Carpenter/ Joiner of Local Government from Ireland
User Rating: ★ ★ ★ ★ ★
A must have for all in the construction industry. Couldn't imagine life without it.Recomend to anyone thinking of purchasing this calculator to buy it, you won't be sorry, it will pay for itself.

0 out of 5.0
User: , Manager of Tomahawk Lumber Company LLC
User Rating:
I do rely greatly on your products and we have many contractor who do also. I have a Construction Master Pro sitting next to my key board at all times, a Construction Master Pro DT Printer and Scale Master Classic on my main desk and a Trig Plus II and Scale Master II in my briefcase. Now that I have a Droid X I'll be loading your app on it also. I don't understand how a true contractor lives without your products. I feel it's products like yours that make the difference between a Professional Quality Contractor and a wood butcher.

5 out of 5.0
User: , President of Kimmel & Kimmel Inc. from Hegins, PA
User Rating: ★ ★ ★ ★ ★
I have been using the Construction Master Pro for years. It is very helpful out in the field.

Construction Master Pro 5 out of 5.0
User: , Superintendant of Tower Arctic Ltd from Iqaluit, Nunavut
User Rating: ★ ★ ★ ★ ★
I'm using my Master Pro most every day. Realy nice tool easy to use.

Still A Great Product 5 out of 5.0
User: , President of Nuera from Calgary, AB
User Rating: ★ ★ ★ ★ ★
This is my second Construction Master Calculator, the first I bought many years ago. Just wanted to update and it is an invaluable tool.

5 out of 5.0
User: , Carpenter from New York
User Rating: ★ ★ ★ ★ ★
Very handy tool.

Awesome 5 out of 5.0
User: from michigan
User Rating: ★ ★ ★ ★ ★
It will be outdated soon because of computer estimating programs. However it is still great for quick calculations for small projects, and alot less expensive than the computer programs.

Great Product! 5 out of 5.0
User: , Office Manager of LeJack Construction from Ludlow, ME
User Rating: ★ ★ ★ ★ ★
I had recently married a man in the construction business. I was lost when it came to measurements. I had no experience in this profession. Now, i can easily figure pitch, width, height, etc. The dvd that came with the calculator showed me exactly how to input the data and come up with the correct answer, it was so easy to understand!

Steel Fabricators 5 out of 5.0
User: , Welder/Fabricator of Weldtech Fabricators Inc from Queens, NY
User Rating: ★ ★ ★ ★ ★
This is a great product. I have used them for the past 9 years and would not be without one. I am working with the calculator every day. They have helped in completing over 1200 projects all across New York and New Jersey!

5 out of 5.0
User: , Operations Manager of Redi Project Services from Lyman, Wyoming
User Rating: ★ ★ ★ ★ ★
It is a great calculator. It makes my job alot easier. I estimate alot of concrete work and using this saves me alot of time.

5 out of 5.0
User: , President of Josh Moore Construction inc. from Grass Valley
User Rating: ★ ★ ★ ★ ★
This is a great calculator. I have used them for the last 15 years and would not be without one. I ordered this product and it was delivered the next day I was amazed. Great company!

easy to use 5 out of 5.0
User: of bomax from austin, tx
User Rating: ★ ★ ★ ★ ★
I am happy with the purchase of this tool. Information is very accurate and I will save a lot of time in the future.

Draftsman 5 out of 5.0
User: from Digby , Nova Scotia
User Rating: ★ ★ ★ ★ ★
Could not get by with out it.

wow 5 out of 5.0
User: from londonderry nh
User Rating: ★ ★ ★ ★ ★
Wish I had this a long time ago

4 out of 5.0
User: of Triple M Housing Ltd from Lethbridge, Alberta
User Rating: ★ ★ ★ ★
I am using it for both work and school. For work it has saved me so much time but in school we need more soft conversion than hard conversion(ex. inches to cm, or yards to metres). It would be nice if you had a calculator with this ability!

Calc. 5 out of 5.0
User: from Twin Falls, Idaho
User Rating: ★ ★ ★ ★ ★
Does all I need!

steel fabricator 5 out of 5.0
User: from Orlando,FL
User Rating: ★ ★ ★ ★ ★
The stair building section really helps.

A Necessity 5 out of 5.0
User: of ShattuckHouse from Colfax
User Rating: ★ ★ ★ ★ ★
We have used this and numerous others from CI for the past twenty years. They have helped in completing over 400 projects spanning all the USA, Canada and some even in Australia. Can's ask "Got Milk"?, but can say "Get Calc'd".

Industrial Form Carpenter 5 out of 5.0
User: from Beechmont Ky
User Rating: ★ ★ ★ ★ ★
Great Job; Does Everything I Need; Thanks

Pro 5 out of 5.0
User: of Scott Morton Construction from Ca.
User Rating: ★ ★ ★ ★ ★
I use the calculater almost every day.It does everything I need it to.

5 out of 5.0
User: from Barbados
User Rating: ★ ★ ★ ★ ★
it a great product, it makes mountains look like mole heaps,its piece of tool everyone in the construction field must have .

Construction Master Pro 4 out of 5.0
User: of Selmers bv from Beverwijk, Holland
User Rating: ★ ★ ★ ★
I am working with the calculator every day.

5 out of 5.0
User: from Chicago, IL
User Rating: ★ ★ ★ ★ ★
It needs the other exponent button, not x2 but x-1. I am using it for the engineer field and I might buy another one (the bigger one of course). Everything else is on the money.

5 out of 5.0
User: of Alliance Engineering from Denver, Co.
User Rating: ★ ★ ★ ★ ★
I'm happy with my calculator save me a lot of time to convert fractions. I will love to buy that one with scientific calculations!!! Or you can send it to me for free

construction master pro 5 out of 5.0
User: from Québec, canada
User Rating: ★ ★ ★ ★ ★
je suis tres tres satisfait de mon achat tres rapide et precise et evite beaucoup de calcul fastidieux je la recommande a tous !

5 out of 5.0
User: of Evans Brothers, Inc. from Livermore, CA
User Rating: ★ ★ ★ ★ ★

calculator 5 out of 5.0
User: from ireland
User Rating: ★ ★ ★ ★ ★
the calculator is excellent and the work book can help work out other problems that you didnt think the calculator could do...

Estimator 5 out of 5.0
User: of DELC CONSTRUCTIOL,LLC from Del Castillo
User Rating: ★ ★ ★ ★ ★
One of the best tool to work easy and fast, I have one long time ago it works perfect and accrate.

Great Product 5 out of 5.0
User: from Garden Grove, CA
User Rating: ★ ★ ★ ★ ★
Thank you a million times over! That's about how many times I have used it in the field to calculate all kinds of numbers in feet and inches. This gem has saved me a lot of money and is a no-brainer for anyone working in the field.

Lost mine 5 out of 5.0
User: from Moranis
User Rating: ★ ★ ★ ★ ★
and I had to get another. It's hard to believe that I am so relient on it now. This calculator is a god send.

Its right 5 out of 5.0
User: from Martinez, GA
User Rating: ★ ★ ★ ★ ★
I use it on every house. I just tote it like I do nails in my nail apron. You really need one if you are going to put rafters on a house. It's just hightly invaluvable. You figure up the measurements one time and you cut the rafters. You don't have to check them.

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[+] Parts & Accessories
Armadillo Gear Soft Tool Belt Case - Orange and Black Armadillo Gear Soft Tool Belt Case - Orange and Black

Nylon Armadillo Gear® Tool Belt Case is large enough to hold both a calculator and its protective cover.
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 a calculator and its protective cover.
LR44 Battery LR44 Battery
( uses 2)

The LR44 battery is equivalent to the Duracell® 303/357 battery.

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