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We will be closed on Friday, April 18, 2025, in observance of Good Friday. Normal business hours will resume on Monday, April 21, 2025.
We will be closed on Friday, April 18, 2025, in observance of Good Friday. Normal business hours will resume on Monday, April 21, 2025.

4090 Sheet Metal/HVAC Pro Calculator

SKU Calc_4090
Original price $89.95
Original price $89.95 - Original price $89.95
Original price $89.95
Current price $84.95
$84.95 - $84.95
Current price $84.95

Quantity Discounts Available

Email hello@underwooddist.com for a quote.

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

Includes

  • 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

Package Dimensions: 8.25 in x 6 in x 1.75 in

MPN: 4090

UPC: 098584040901

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