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Full Product Description

Calculated Industries 4065 Construction Master® Pro

Sets the industry standard for advanced construction-math calculators.

It provides powerful built-in solutions and expanded preference settings. It’s easy to use in the field or office and perfect for completing plans, layouts, bids and estimates – saves time, money, materials, and frustration.

Work smarter, build better, and improve your bottom line with the Construction Master Pro!

Learn more about this product here: Construction Master Pro Calculator Introduction and How to use

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
  • New Features, Functions, and Enhanced Solutions: 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

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 +, -, +/-, x, ÷, %, π, 1/x, X2, and √
  • Automatic Shut-Off saves battery life
  • Includes Protective Hard Slide Cover, Easy-to-follow User's Guide, Handy Pocket Reference Guide in English and Spanish
  • Long-Life Batteries
  • Full One-Year Limited Warranty
  • English and Spanish CD-ROM with “How To” Video and User’s Guide

Tech Specs

  • Size: 5.6” x 3.0” x 0.6” (142.8mm x 76.2mm x 15.9mm)
  • Product Weight: 4.5 oz. (127.5 gm)
  • Includes Case and Pocket Reference Guide
  • Power: Two 1.5-volt (LR-44/A76) Long-life Batteries
  • Display Type: 11 Digits (7 normal, 4 Fractions) with Full Annunciators
  • Display Dimensions: 0.625” x 2.5” (15.88 mm x 63.5 mm)
  • Accuracy: 10 Digit Internal Accuracy

Words from our fantastic customers.

Still not convinced? Check out our reviews!

Amy S.

High School Math Teacher

I have ordered calculators from Underwood Distributing for so many years that I have last track of the time. They are always quick to answer my emails and they get the product I need shipped out asap! 10/10

Mandee P.

Middle School Math Teacher

I teach middle school and wanted reliable calculators, at a good priced, and in a distinct color so everyone knows who they belong to. They were well-packed and arrived quickly! I am so pleased with my purchase and will keep this company in mind for future needs.

Math Teacher

Fort Zumwalt School District

My current order of graphing calculators was placed and ordered so quickly. Underwood Distributing Company made this process easy and I appreciate the timeliness along with the great price.

Underwood Distributing Co.

Discover more in our FAQs

How do I cancel or edit an order?

Because orders are processed and shipped within 0–2 business days, it's important to reach out to us as quickly as possible if you need to cancel or make a change. The best way to do this is to contact us directly:

Please include your order number and the change or cancellation you need. We're a small, flexible business and will do everything we can to accommodate your request before your order ships. Once an order has shipped, it cannot be cancelled, and you would need to follow our standard return process instead.