Calculated Industries Sheet Metal/HVAC Pro  Materials Estimator 4090


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


Works directly in Feet, Inches, Fractions, Yards, and Meters – including Square and Cubic formats.

Built-in custom sheet metal functions