Amps to Watts Calculator
Convert amps to watts quickly using common voltage assumptions for practical electrical planning.
Electrical Calculators
Use these calculators for quick sanity-check math before deeper design and field verification. New to voltage, current, and resistance? Start with Electricity Basics.
Power & Current Conversions
Quick conversions between amps, watts, volts, kW, and kVA for common single-phase planning checks.
Watts to Amps Calculator
Convert watts to amps quickly when voltage is known for practical planning checks.
Volts to Watts Calculator
Estimate watts from volts and amps with a quick electrical planning calculator.
Single-Phase kVA to Amps Calculator
Convert kVA to amps using nominal voltage for single-phase planning checks.
Single-Phase Amps to kVA Calculator
Convert amps to kVA using nominal voltage for single-phase planning checks.
Single-Phase kW to Amps Calculator
Convert kilowatts to amps using voltage for single-phase planning checks. Fast, no sign-up required.
Single-Phase Amps to kW Calculator
Convert amps to kilowatts using voltage for single-phase planning checks. Fast, no sign-up required.
Single-Phase Power Calculator
Calculate single-phase real power (watts) and apparent power (VA) from voltage, current, and power factor. Free online tool for home and light commercial circuits.
Three-Phase Power Calculator
Calculate three-phase real power (kW) and apparent power (kVA) from line voltage, phase current, and power factor. For commercial and industrial electrical systems.
Generator Wattage Calculator
Estimate generator running watts, startup demand, and a practical generator size for refrigerators, sump pumps, freezers, and other home backup loads.
Watts to Kilowatts Converter
Convert watts to kilowatts instantly: kW = W ÷ 1000. Works in both directions. See the formula, common appliance examples, and a quick reference table.
Circuit Laws & Component Tools
Ohm's Law relationships, power factor, breaker sizing, and resistor color code decoding.
Ohm's Law Calculator (V / I / R / P)
Solve Ohm’s Law and power relationships between voltage, current, resistance, and power with practical examples.
Wire Size Calculator
Estimate a common residential wire size starting point based on amps, distance, voltage, conductor material, and voltage drop target.
EV Charger Amps Calculator
Convert Level 2 EV charger power into charging amps and a minimum breaker size for 208V or 240V planning.
Energy & Cost Estimators
Estimate kWh consumption and monthly electricity running cost from wattage and runtime.
kWh Calculator (Energy Use)
Fast kWh calculator with worked examples to estimate appliance energy use from watts and runtime.
Electricity Cost Calculator
Estimate electricity cost from watts, runtime, billing days, and your $/kWh rate with practical examples.
Voltage Drop
Quick checks for the effect of conductor run length on delivered voltage.
Extension Cord Size Calculator
Estimate a practical extension cord gauge from amps, cord length, and voltage-drop-aware planning for tools, pumps, and temporary household loads.
Voltage Drop Calculator
Estimate voltage drop for typical runs and understand when conductor length affects performance.
Disclaimer: Results are informational estimates for learning and planning only. Always follow the applicable electrical code and consult a qualified licensed electrician for safety-critical work.