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Electrical calculators and tools
Start with the value you know. These tools keep real power, apparent power and power factor clear, with the assumptions beside the result.
Real power and current
Watts to amps calculator
Convert watts or kilowatts to amps, or work backward from current. Choose DC, single-phase AC or balanced three-phase AC, then enter voltage and power factor where needed.
Includes voltage comparisons, batch calculations and copyable results.
Apparent power and current
kVA to amps calculator
Find current from apparent power and voltage for single-phase or balanced three-phase AC. Select the correct line-to-line or line-to-neutral voltage reference.
Uses apparent power directly, so no extra power factor adjustment is needed.
Matching W and VA readings
Power factor calculator
Divide real power by apparent power for the same load and operating condition. Enter W or kW alongside VA or kVA to see the factor as a decimal and a percentage.
Shows the ratio to use in a watts-to-amps calculation and flags incompatible readings.
Choose by the reading you have
Use watts for real electrical input power and VA or kVA for apparent power. Current calculations also need voltage and the applicable circuit type. These tools explain their assumptions and do not select breakers or wire sizes.
Every calculator is free in full and runs in your browser. If a result or explanation needs attention, email contact@wattstoamps.app.