Electrical, Plumbing & HVAC Calculators & Estimators
Wire sizing, loads, conduit, lighting and system sizing. Built for homeowners planning a project and contractors preparing a bid: enter dimensions, get the quantities and budget ranges suppliers actually quote in.
Wire Size Calculator
Copper wire gauge (AWG) from circuit amperage and run length.
Electrical Load Calculator
Estimate service demand from square footage and major appliances.
Conduit Fill Calculator
Max conductor counts per conduit size at NEC 40% fill.
Recessed Lighting Calculator
Can light count and spacing from room size and ceiling height.
Water Softener Size Calculator
Softener grain capacity from household size, usage and hardness.
BTU Calculator
Heating and cooling BTUs from room area, climate and insulation.
HVAC Size Calculator
Whole-home HVAC tonnage estimate from conditioned area and climate.
When to use which calculator
Size in this order: total demand at the Load Calculator, then per-circuit conductor at the Wire Size Calculator, then raceway at the Conduit Fill Calculator. Comfort systems start from the BTU Calculator and finish at the HVAC Size Calculator. All electrical outputs are planning references — final sizing follows NEC and local inspection.