# Trade Calculator - Sheet Metal — Construction & HVAC Tool

> Construction and HVAC calculator for feet, inches, fractions, and specialized trade math. (iPhone/iPad app by Matthew Lutterloh.)

- Source: https://appshunter.io/ios/app/trade-calculator-sheet-metal/id6758922258 (this page in markdown: same URL + `.md`)
- Developer: [Matthew Lutterloh](https://appshunter.io/developer/1875780465)
- Category: Utilities, Productivity
- Price: Free
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 18.0 · 13 MB
- Languages: American English
- Released: 2026-02-12
- Data updated: 2026-06-01
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/trade-calculator-sheet-metal/id6758922258/reviews.md

## What is Trade Calculator?

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.

## Key features

- Feet-inches-fractions arithmetic
- Adjustable fraction precision
- Scientific and trigonometric functions
- Construction trade calculations
- HVAC duct sizing (Imperial/SI)
- Offline functionality


## Frequently asked questions about Trade Calculator

### What is Trade Calculator used for?

Trade Calculator is designed for construction professionals and HVAC technicians to perform calculations involving feet, inches, and fractions. It includes a scientific calculator, specialized trade functions, and HVAC duct sizing.

### Does Trade Calculator work offline?

Yes, Trade Calculator works completely offline. No internet connection is required to use its features, making it ideal for job sites.

### What kind of trade calculations can Trade Calculator perform?

Trade Calculator can perform calculations for hip and valley rafters, jack rafters, pipe and duct offsets, column and cone layouts, and pitch calculations. It also includes a triangle solver for side and angle calculations.

### How does the HVAC duct calculator work?

The HVAC duct calculator uses the ASHRAE equal friction method. You can input any two values (air flow, friction loss, velocity, or duct diameter) to solve for the remaining ones, and it calculates equivalent rectangular duct sizes.

### Does Trade Calculator have ads?

No, Trade Calculator does not have ads. The app is free and ad-free, as stated in its description.

### Is Trade Calculator available on multiple devices?

Yes, Trade Calculator is supported on both iPhone and iPad devices, as indicated by its platform compatibility.

### What is the fraction precision in Trade Calculator?

Trade Calculator offers adjustable fraction precision, allowing users to choose from 1/2 through 1/64 for accurate measurements.

### How often is Trade Calculator updated?

Trade Calculator was last updated on February 12, 2026, with version 1.0.1. This indicates a recent update, suggesting ongoing support.

## Version history (last 1 release)

### 1.0.1 — 2026-02-12

No release notes.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-01.*