About FreeTradeCalc
FreeTradeCalc provides free, professional-grade online calculators for construction and trade professionals. Our tools are designed by engineers and built for the people who work in the field every day.
Our Mission
We believe every electrician, HVAC technician, plumber, and construction professional deserves access to accurate, easy-to-use calculation tools. Our calculators are based on current industry standards including NEC 2023, ASHRAE Handbook, and IPC 2021.
Standards We Reference
NEC 2023
National Electrical Code for all electrical calculations
ASHRAE
ASHRAE Handbook for HVAC sizing and airflow calculations
IPC 2021
International Plumbing Code for pipe sizing and fixture calculations
Disclaimer
FreeTradeCalc calculators are intended as estimation tools for qualified professionals. Always verify calculations against applicable local codes and consult with a licensed professional for final design decisions. We do not accept liability for errors or misuse of these tools.