Sizing a circuit
Recommended path
Use wire size and voltage drop together so the conductor satisfies both ampacity and distance.
Calculator directory
All VoltTally calculators
Electrical and home-energy planning tools with visible assumptions. Use them for budgeting, sizing, and sanity checks before you confirm details with a licensed pro or local code authority.
Voltage Drop
Voltage Drop Calculator
Check voltage drop % and size conductors for any run — copper or aluminum, single- or three-phase.
Open calculator Wire SizeWire Size & Ampacity Calculator
Find the right wire gauge for a given current, distance, and voltage-drop limit.
Open calculator EV Charger CostEV Charger Installation Cost
Estimate a Level 2 home EV charger install — hardware, labor, and panel work.
Open calculator Running CostAppliance Electricity Cost Calculator
See what any appliance costs to run per hour, day, month, and year at your rate.
Open calculator Heat Pump CostHeat Pump Cost Calculator
Estimate heat-pump install cost and running cost vs your current system.
Open calculatorPlanning an EV install
Recommended path
Estimate the charger project cost, then check wire size and voltage drop for the run.
Reducing energy bills
Recommended path
Use appliance running cost and heat pump cost to compare recurring energy tradeoffs.