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Construction Master Pro Trig
Construction Master Pro Trig
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Model # 4080

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Construction Master Pro Trig
Reviews (21)

Advanced Feet-Inch-Fraction Construction-Math Calculator with Full Trig Functions

The Construction Master Pro Trig provides construction professionals with complete trig functions to help them quickly and easily solve complex construction-math problems. It saves time, reduces costs and prevents re-work. You can effortlessly work in and convert between feet-inch-fractions and metric units. Instantly calculate complex construction challenges for stair layouts, roofs, framing and much more. Full trig functions with sine, cosine, tangent, arcsine, arccosine and arctangent.

Construction Calculations:

  • Work in and convert between any building dimension, including Metric
  • Trig Function
  • Find Weight per Volume
  • Built-in Right-Angle solutions
  • Complete Stair Layouts
  • Roof, Rafter and Framing solutions
  • Circular: Arcs, Circumference, Segments and More
  • Stairs - Set Riser Height and solve for Stairwell Opening
  • Studs - Find number On-center for an entered Length
  • Compound Miter Cuts Arched Rake-Walls
  • Equal sided Polygons
For Contractors, Architects, Engineers, Project Managers, Estimators, Draftspersons, Builders, Framers, Carpenters, Tradespersons
Dimensional Math and Conversions
  • Work in and convert between all building dimensional formats: Yards, Feet-Inch-Fractions, Decimal Feet and Inches and Metric - including Area and Volume
  • D:M:S to Decimal Degree conversions
  • Weight per Volume
  • Full Trig Function: Sine, Cosine, Tangent, Arcsine, Arccosine and Arctangent simplify complex design and construction-math

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
  • 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 Miter 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
  • 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: Allows for review of last 20 entries; double-check totals
  • Standard Calculations: Works as a math calculator with +, -, +/-, ×, ÷, %, π, 1/x, x2, and √
  • Automatic Shut-Off saves battery life


  • Rugged shock, dust and moisture-resistant Armadillo Gear case
  • Pocket Reference Guides in English and Spanish
  • Two LR44 long life batteries
  • One-year 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 grams)
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

Overall Rating Full StarFull StarFull StarFull StarFull Star
4.8 out of 5 21
User Reviews
5 out of 5.0
User: , Carpenter Foreman of Eastwind Corp from Holbrook , Ma
User Rating: ★ ★ ★ ★ ★
excellent product. I have purchased a few and am never disappointed with them. the use of my construction master is vital to my work and makes once difficult calculations a breeze ! thanks

Construction Master Pro trig 5 out of 5.0
User: , Architect of Norman Architects from Cedarburg, WI
User Rating: ★ ★ ★ ★ ★
I have been using Calculated Industries calculators for at least 20 years. I bought them for all my employees so they would stop wasting time and be more accurate. I am lost without my Construction Master Pro Trig. A great tool in the office and on the construction site.

A must have 5 out of 5.0
User: , Owner of Welton Equipment from Ada, OK
User Rating: ★ ★ ★ ★ ★
I use this for everything from surveying calcs to finish work. If you don't have one you are wasting a lot of time figuring things the hard way.

Just what I was looking for 5 out of 5.0
User: , Project manager of Sippel steel fabrication from Swickley, pa
User Rating: ★ ★ ★ ★ ★
I was looking into buying a calculator that will quickly and easily help me with calculating stair dimensions and other angular calcs. This product is spot on

0 out of 5.0
User: of PRB Design, Inc.
User Rating:
Just want to say that I bought a Professional Measure Master II about 27 years ago. I used it for about 10 years and then bought the Construction Master Pro Trig and put my original calculator in a drawer. Well, about 17 years later (recently), I found it in a drawer and the battery still works! I've used it daily for the last few months now and it's still going strong. Unbelievable! Thanks for a great product.

Construction Master Pro Trig 5 out of 5.0
User: , Senior Drafter of JF Ahern from Fond du Lac, WI
User Rating: ★ ★ ★ ★ ★
This calculator meets all of our engineering tasks that we perform. Its great only having to have one calculator instead of two to perform all of the functions provided on this one.

Good Calc-Ok Durability 4 out of 5.0
User: , Senior Drafter of J. F. Ahern Co. from Fond du Lac, WI
User Rating: ★ ★ ★ ★
These calculators are great. The armadillo casing tops its excellence. The only issue is that if you use it day in and day out, the buttons wear out within a year.

5 out of 5.0
User: from mountaintop.pa.
User Rating: ★ ★ ★ ★ ★

Construction Master Pro Trig 5 out of 5.0
User: , Engineering Manager of Specialty Tank Services from La Porte, tx
User Rating: ★ ★ ★ ★ ★
The company I work for builds and repairs API Aboveground Storage Tanks. We go around in circles every day all day long! The Trig functions and the conversion functions are fantastic! We have purchased 7 Construction Master Pro Trig calculators for each of our employees and will purchase more as we hire new people!

construction master pro trig 4 out of 5.0
User: from los angeles
User Rating: ★ ★ ★ ★

FEED BACK 5 out of 5.0
User: , CAD DRAFTMAN of Artistic Iron Works from Des Moines Iowa
User Rating: ★ ★ ★ ★ ★

Cont. Master Pro Trig 5 out of 5.0
User: , Pipe Fitter of AES from Pruehoe Bay, AK
User Rating: ★ ★ ★ ★ ★
Cont. Master Pro Trig has worked for me so far,… very easy calculator to use.

Pro Trig 4 out of 5.0
User: of Healy, Long & Jevin from Wilmington, Delaware
User Rating: ★ ★ ★ ★
Some of the functions that were easily accessable on the earlier model are now hard to find,for example the metric conversions.

5 out of 5.0
User: of Kiewit Western Co. from Omaha, NE
User Rating: ★ ★ ★ ★ ★

Const Master Pro Trig 5 out of 5.0
User: from Charleston,SC
User Rating: ★ ★ ★ ★ ★
I am a pipefitter & this calulator is great for calulating compound offsets & related items like chord lengths.If you have a math problem this calculator can do it.Its also very easy to use.Its a must have Item for the pipefitter/Welder.

Const. Master Pro Trig 5 out of 5.0
User: of Timber Roots from De Pere, WI
User Rating: ★ ★ ★ ★ ★
The Construction Master Pro Trig is an easy and very usefull tool I use everyday with my job.

Pro Trig 5 out of 5.0
User: of Pioneer Builders Inc from Port Orchard, WA
User Rating: ★ ★ ★ ★ ★
I love it. There isn't anything I don't like about it.

Pro Trig 5 out of 5.0
User: of Exxcel Project Managment from Columbus, Ohio
User Rating: ★ ★ ★ ★ ★
I bought this for my son who is a senior in construction managment. It is a wonderful tool.

Works excellent! 5 out of 5.0
User: from Gainesville Florida
User Rating: ★ ★ ★ ★ ★
I have no complants other then the stair function I think could be more user friendly.

Would buy again 5 out of 5.0
User: from Saint Louis, Mo
User Rating: ★ ★ ★ ★ ★
One of the better calculators I have used. It far more user friendly than the Jobber or a regular calculator.

4 out of 5.0
User: of Utility Engineering from Denver, Co
User Rating: ★ ★ ★ ★

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
$14.95 Armadillo Gear Soft Tool Belt Case - Lime Green | Add to Cart
LR44 Battery LR44 Battery
(Construction Master Pro Trig uses 2)

The LR44 battery is equivalent to the Duracell® 303/357 battery.
$2.50 LR44 Battery | Add to Cart

• User's Guide • Pocket Reference Guide
• Spec Sheet • Product Comparison Grid