Professional Trade Calculators
Free online calculators for electricians, HVAC technicians, plumbers, and construction professionals. Based on NEC 2023, ASHRAE, and IPC standards.
Calculator Categories
Electrical Calculators
Professional electrical calculators for voltage drop, wire sizing, conduit fill, ampacity, and more. Based on NEC 2023 standards.
10 calculatorsHVAC Calculators
HVAC calculators for BTU sizing, duct design, refrigerant charge, heat load, and airflow calculations. Based on ASHRAE standards.
10 calculatorsPlumbing Calculators
Plumbing calculators for pipe sizing, water pressure, flow rate, drain slope, and fixture unit calculations. Based on IPC 2021.
7 calculatorsGeneral Construction Calculators
General construction calculators for concrete, paint, and lumber quantity estimation.
3 calculatorsPopular Calculators
Voltage Drop Calculator
Calculate voltage drop in electrical circuits based on wire gauge, length, and load current per NEC standards.
BTU Calculator
Calculate heating and cooling BTU requirements based on room size, insulation, climate zone, and occupancy.
Pipe Size Calculator
Calculate the required pipe diameter based on flow rate and maximum velocity per plumbing codes.
Conduit Fill Calculator
Calculate conduit fill percentage based on wire count and sizes per NEC Chapter 9 Table 1.
Duct Size Calculator
Calculate required duct dimensions based on CFM airflow requirements and maximum velocity.
Concrete Calculator
Calculate the amount of concrete needed in cubic yards based on slab, footing, or column dimensions.