Calculated Industries 4090 Sheet Metal/HVAC Pro Calc Calculator, Advanced Construction-Math for Sheet Metal, HVAC Pros with Fan Law Functions, ArcK Built-in Constant, Laws of Cosines, Offset Functions

BUILT FOR SHEET METAL AND HVAC PROFESSIONALS — The Sheet Metal/HVAC Pro Calc is designed with leading industrial training organizations to deliver fast, accurate solutions for duct layout, Test & Balance (TAB), and advanced trade calculations. Improve accuracy, reduce costly errors, and increase productivity in both training and field work. POWERFUL HVAC AND SHEET METAL FUNCTIONS — Built-in Fan Law calculations simplify TAB using CFM, RPM, SP, BHP, velocity, and velocity pressure. Dedicated functions include x, y, r (radius), theta, segment radius, polar/rectangular conversions, offset calculations for “S” bends, wrapper length, and centerline radius. ADVANCED MATH MADE SIMPLE — Includes trig functions, Laws of Cosines for non-90° triangles, ArcK constant for arc length, and order-of-operations entry with parentheses. Perform square, cube, root, and standard calculations with ease. ADDITIONAL CONSTRUCTION MATH — Work in feet-inch-fractions or metric; calculate areas, volumes, slopes, stairs, rafters, more. JOBSITE READY — Includes rugged Armadillo Gear protective case, guides, batteries, and safety-compliant tool-secured battery compartment. Button-Cell Battery Safety Compliant Design -- battery housed in a compartment secured with a tool-required fastener, supporting alignment with applicable U.S. consumer product safety requirements. Order now and get Sheet Metal/HVAC Pro Calc to start solving advanced-math challenges. Copyright 2026 Calculated Industries. All Rights Reserved.

• CUSTOM HVAC & SHEET METAL functions let you simplify Test and Balance (TAB) with built-in Fan Law function: CFM, RPM, SP and BHP; plus velocity and velocity pressure: FPM, VP, MPS, KPa; ArcK constant for convenient Arc length solutions; and offset functions
• FUNCTIONS AND TERMINOLOGY consistent with sheet metal and HVAC trade terminology; x, y, r (radius), theta and Seg Radius functions; works in and converts between feet-inch-fractions, decimal feet and inches and metric also converts between polar and rectangular coordinates
• PARENTHESIS OPERATORS allows you to easily enter complex formulas; order of operations calculations retain familiar mathematical hierarchy as a default preference; trigonometric operation and sequence; plus you can calculate square, square root, cube, and cube root; easy non-90 triangles and right-angle solutions for ductwork length and angles
• MEMORY STORAGE conveniently stores frequently used constants or interim solutions; Memory swap lets you easily insert stored values into current calculations and simultaneously store calculated values while recalling and displaying Memory contents; other settable User Preferences