Trades: Calc

The only app that replaces your Construction Master Pro AND gives you code-aware calculators for every trade — electrical, concrete, framing, plumbing, HVAC, and welding. All in one app. No subscriptions. Ever.

TRY BEFORE YOU BUY
Download free and get 1 working calculator from each of the 6 trade packs. No credit card. No time limit. See if it works for your job site before you spend a dime.

WHAT'S INSIDE

Electrical Pack — 11 Calculators
Wire ampacity (NEC Table 310.16), voltage drop, conduit fill, box fill, motor circuit sizing, residential load calculation, transformer KVA, EVSE load, Ohm's law solver, parallel resistance, BTU-kWh converter. Edition-aware: NEC 2017, 2020, 2023, and 2026.

Concrete Pack — 10 Calculators
Slab volume, footing volume, minimum PSI by application (ACI 318-19 exposure classes), rebar spacing, footing size by soil bearing, water-cement ratio, concrete order calculator, post hole calculator, block/CMU wall, formwork estimator. Supports IBC 2018, 2021, and 2024.

Framing Pack — 8 Calculators
Rafter length with bird's mouth check, header sizing (IRC R602.7), board feet, stud count with California corners, floor joist span (IRC R502.3.1), roof pitch to angle with material minimums, stair stringer with IRC code checks, compound miter for crown molding. Supports IRC 2018, 2021, and 2024.

Plumbing Pack — 9 Calculators
Pipe sizing by flow, pressure drop (Hazen-Williams), DWV drain pipe sizing, water heater sizing, DFU count, thermal expansion, WSFU count, gas pipe sizing (IFGC), pipe offset with rolling offset support. Code-aware: IPC 2021/2024 and UPC 2021/2024.

HVAC Pack — 10 Calculators
BTU rule of thumb, CFM per room, duct sizing (equal friction), refrigerant charge (superheat and subcooling with R-454B, R-410A, R-32 support), static pressure, equipment tonnage, sensible heat ratio, SEER2 operating cost with DOE regional minimums, psychrometric calculator, gas pipe sizing for HVAC equipment. Based on ACCA Manual J 8th Edition.

Welding Pack — 11 Calculators
TIG/MIG amperage by thickness, stick (SMAW) amperage by electrode, wire feed speed, heat input (kJ/in per AWS D1.1), preheat temperature/carbon equivalent, shielding gas flow rate, filler metal selection with D1.1 prequalified status, fillet weld strength (ASD/LRFD), filler metal weight estimator, welding cost calculator, FCAW parameters. Supports AWS D1.1-2020 and D1.1-2025.

REFERENCE TABLES INCLUDED
Browse NEC, IRC, IPC, AWS, and ACI code tables right in the app. No flipping through codebooks. Tables include NEC 310.16 ampacity, IRC joist spans, IPC DFU values, AWS preheat tables, ACI exposure class requirements, and more.

WHY TRADES: CALC?

No subscriptions. Construction Master Pro charges $35/year. We charge once.

All trades in one app. Stop juggling 5 separate apps on the job site.

Code-aware. Pick your NEC edition (2017–2026). Toggle IPC vs UPC (2021/2024). Select your IRC year (2018–2024). Choose AWS D1.1-2020 or 2025. The app knows which code you're working under.

Accurate. Every formula audited against primary code sources — NEC 2026, ACI 318-19, IRC 2024, IPC 2024, AWS D1.1-2025.

Works offline. Every calculation runs locally. No internet required. No account required.

PRICING
Free — 1 calculator per pack (6 total) + browse the app
Core Unlock ($9.99) — Full app + reference tables + choose 1 free trade pack
Additional Packs ($6.99 each) — Add any trade you need
All Access ($34.99) — Everything. All 59 calculators. All reference tables. All future content. Forever.

All calculations are for reference only. Verify results with your AHJ and a licensed professional.