Free online electrical calculators for construction professionals, contractors, and DIY enthusiasts.
Most used tools
Calculate total watts from your appliances
Find the right wire gauge for your circuit
Calculate voltage drop over a wire run
Calculate how many fixtures a room needs
Solve V, I, or R using Ohm's Law
Determine how many panels you need
Recently popular tools
18 tools available
Calculate total watts from your appliances
Find the right wire gauge for your circuit
Calculate voltage drop over a wire run
Find the right breaker for your load
Calculate conduit size from wire count
Calculate transformer kVA from load
Determine generator kW for your load
Calculate how many fixtures a room needs
Calculate kVAR for power factor correction
Solve V, I, or R using Ohm's Law
Calculate watts from voltage and current
Calculate kWh from power and hours
Determine how many panels you need
Calculate battery runtime from load
Determine max load for a circuit
Calculate main breaker panel size
Size ground wire from service conductors
Estimate monthly electricity cost
More construction tools available
Our electrical calculators provide accurate, instant results for construction professionals, contractors, and DIY enthusiasts. Each calculator uses industry-standard formulas and handles edge cases to deliver reliable estimates.
Whether you need to estimate materials, calculate costs, or plan your next project, our electrical tools deliver reliable results to help you make informed decisions and stay on budget.
