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Sheet Metal/HVAC Pro
Model 4090
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MSRP: $89.95
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[+] Overview

Advanced Construction-Math Calculator for Sheet Metal, HVAC

The Sheet Metal/HVAC Pro Calc is designed for sheet metal workers and HVAC technicians to simplify dimensional math, geometry, trig, and has custom HVAC functions all in one simple-to-use and versatile tool for skilled tradesmen.

Sheet metal calculations
  • X, Y, R (radius)
  • Theta
  • Seg Radius
  • Converts between Polar and Rectangular Coordinates
  • Offset functions determine "S"- shaped bends in ductwork
Additional features
  • Order of operation
  • Parenthesis operators
  • Square, cube, square root, and cube root calculations
  • Works as a regular calculator
  • Backspace key for last entry editing
Trigonometric functions
  • Sine, Cosine, Tangent, Arcsine, Arcosine, and Arctangent
  • ArcK Constant
  • Calculates non-90° triangles
Built-in HVAC formulas
  • Fan Law Functions for Test and Balance (TAB)
  • Velocity
  • Velocity Pressure
Advanced construction-math functions
  • Work in and convert between building dimensional formats: feet, inch, fractions, and metric
  • Calculate instant areas and volumes
  • Perform square-ups, slopes, rafters, and more
  • Determine regular, irregular hip/valley rafter lengths plus plumb, level, and cheek cut angles
  • Perform complete stair layouts
  • Find circle, column/cone surface area, and volume solutions
  • Complete D:M:S to decimal degree conversions

[+] Details
Built-in custom sheet metal functions
  • x, y, r (radius), theta, and Seg Radius Functions
  • Allows for conversion between Polar and Rectangular Coordinates
  • Offset Functions for "S-shaped" bend in ductwork solves layout for wrapper length, Centerline Radius, and the Angle
Mathematical Functions
  • Parenthesis Operators allows users to enter complex formulas
  • Calculations retain familiar mathematical hierarchy as a default preference
  • Trigonometric operation and sequence
  • Calculate square, square root, cube, and cube root
  • Determine right-angle solutions for ductwork length and angles
  • Works as a standard calculator
Memory Storage
  • Stores frequently used constants or interim solutions
  • Memory swap enables you to insert stored values into current calculations and simultaneously store calculated values while recalling and displaying memory contents
  • Users can set preferences
Test and Balance (TAB)
  • Fan Law functions: CFM, RPM, SP, and BHP
  • Velocity and Velocity Pressure: FPM, VP, MPS, KPa
  • ArcK constant for convenient Arc length solutions
  • Rugged shock, dust, and moisture-resistant Armadillo Gear case, and a protective slide cover
  • Quick reference guide and complete easy-to-follow user's guide,
  • 2 Long-life batteries (LR-44)
  • One-year limited warranty

Tech Specs

  • Size: 5.6" x 3.0" x 0.5" (142mm x 76mm x 13mm)
  • Product Weight: Calculator only 3.2 oz. (91gm)
  • Power: Two 1.5 volt (LR 44) Long-life Batteries
  • Display Type: LCD
  • Display Dimensions: 2.5"L x 0.75"W (64mm x 19mm)
  • Accuracy: 12 Digit Internal Accuracy

[+] Reviews
Overall Rating Full StarFull StarFull StarFull StarFull Star
5 out of 5 
User Reviews
Very user friendly 5 out of 5.0
User: , Instructor of Utah Sheet Metal Education and Training from Salt Lake City, Utah
User Rating: ★ ★ ★ ★ ★
The functions most commonly used are extremely easy to find and apply. Very valuable tool every sheet metal journey person should have.

Great Calculator 5 out of 5.0
User: , Training Coordinator of Utah Sheet Metal Education & Training from Salt Lake
User Rating: ★ ★ ★ ★ ★
I have used this calculator training Sheet Metal Apprentices for many years. It makes some of the more complicated math functions easier to understand and apprentices are more likely to use them in their day to day

Great Product! 5 out of 5.0
User: , Instructor of utah sheet metal education from salt lake city Ut
User Rating: ★ ★ ★ ★ ★
I'm a teacher and we use this calculator daily in our program. I love how simple the calculator is to use and understand.

5 out of 5.0
User: , Training Coordinator
User Rating: ★ ★ ★ ★ ★
The Sheet Metal/HVAC Pro is a great calculator. We use it in our apprentice program and sell them to our journeypersons. We offer continuing education class on how to use its functions. Itís a great tool to have on the job.

5 out of 5.0
User: , Training Coordinator of Hawaii Sheet Metal Workers
User Rating: ★ ★ ★ ★ ★
In our industry there are HVAC, Architectural, Industrial Welding, Testing, Adjusting & Balancing, HVAC Servicing, Specialty Sheet Metal and much more.
The Sheet Metal/HVAC Pro calculator has a lot of functions that fits the needs in every jurisdiction in the sheet metal industry.
At SMART Union Local-293, Hawaii, we use it extensively in our apprenticeship training program, and lots of our members uses it to help them with their work on the field.
Calculated Industries produces great products for all trades.

[+] Download the App

[+] Support Materials

User's Guide
Pocket Reference Guide
Spec Sheet