Trade Calculator - Sheet Metal

The construction calculator built by tradespeople, for tradespeople. Feet, inches, fractions, and HVAC duct sizing — all in one app.

Trade Calculator is the essential tool for construction professionals, sheet metal workers, HVAC technicians, and anyone who works with feet, inches, and fractions every day.

Built by tradespeople, for tradespeople — this app replaces the need to carry a separate construction calculator in the field.

THREE POWERFUL SCREENS:

SCREEN 1 — SCIENTIFIC CALCULATOR Full arithmetic with native feet-inches-fractions support. Enter dimensions in feet and inches, choose your fraction precision (1/16, 1/32, 1/64), and get accurate results without manual conversions. Includes trigonometric functions, memory registers, and a triangle solver for angles and sides.

SCREEN 2 — TRADE FUNCTIONS Purpose-built construction math at your fingertips: hip and valley rafters, jack rafters, pipe and duct offsets, column and cone layouts, and pitch calculations — all with the same fraction-friendly number pad.

SCREEN 3 — DUCT CALCULATOR HVAC duct sizing based on the ASHRAE equal friction method. Enter any two of air flow, friction loss, velocity, or duct diameter to instantly solve for the remaining values. Toggle between Imperial (CFM, FPM, in.wg) and SI (L/s, m/s, Pa/m) units. Equivalent rectangular duct sizes are calculated automatically.

KEY FEATURES: • Native feet-inches-fractions arithmetic (no decimal conversions needed) • Adjustable fraction precision: 1/2 through 1/64 • Scientific functions: trig, arc trig, squares, square roots • Construction trade functions: hip/valley, jack rafters, offsets, columns • HVAC duct sizing with Imperial and SI support • Equivalent rectangular duct size table • Multiple memory registers • Triangle solver (side/angle calculations) • Clean, intuitive interface designed for job-site use • No internet connection required — works completely offline • No ads. No subscriptions. No data collection.