Trade Calculators Built for Professionals
Mobile-first calculators designed for the job site. Pick your trade, get the right tools.
Choose Your Trade →Choose Your Trade
Electrician Calculators
Professional electrical calculators for electricians
HVAC Calculators
HVAC load and sizing calculators for technicians
Plumbing Calculators
Code-referenced plumbing calculators — UPC & IPC pipe sizing, drainage, gas
Roofing Calculators
Code-referenced roofing calculators — IRC rafters, ASCE 7 loads, SMACNA drainage
Why TradeCalc?
- ✓ Built for your trade. Not a sea of unrelated calculators — every tool is specific to what you do.
- ✓ Works on the job site. Mobile-first design means big buttons, clear results, no zooming required.
- ✓ Code references included. Every calculator links to the relevant NEC, ASHRAE, or IPC code sections.
Popular Calculators
Voltage Drop Calculator
Calculate voltage drop for copper and aluminum wire based on wire size, length, and load current per NEC.
Wire Size Calculator
Determine minimum wire size (AWG) for your circuit based on load current, distance, and voltage drop per NEC.
Electrical Load Calculator
Calculate total electrical load for residential and small commercial buildings following NEC Article 220.
BTU Calculator
Calculate the heating and cooling BTU requirements for a room based on square footage, insulation, climate zone, windows, and occupancy.
HVAC Load Calculator
Simplified Manual J HVAC load calculation for residential buildings. Estimates heating and cooling loads by size, climate, and occupancy.
AC Tonnage Calculator
Calculate AC tonnage for your home based on square footage, climate zone, insulation, and other factors.