Trade Calculators for Professionals
Fast, accurate calculators built on NEC tables, Manual J methods and industry-standard formulas. No sign-up required.
Electrical Calculators
HVAC & Plumbing
Construction & Materials
Built for the Trades
TradeCalc gives electricians, HVAC technicians, plumbers and general contractors the quick-reference tools they need on the job. Every calculator is based on the same standards and code tables you already rely on — NEC 310.15 ampacity tables, ACCA Manual J load calculations, and standard construction estimating formulas.
Why Use TradeCalc?
- No account required — open a tool and start calculating immediately.
- Mobile-friendly — works on your phone in the field or on your laptop in the office.
- Code-referenced — results cite the NEC sections and formulas used so you can verify everything.
- Always free — every tool on this site is free to use, forever.
Results are intended as a professional starting point. Always verify calculations against the current code edition, manufacturer data sheets and your local jurisdiction's requirements before finalising any design or installation.