Electrical Calculators
56 free calculators
Ohm's law, power, voltage, current, and circuit calculators.
Amps to Watts Calculator
Convert amps to watts for DC and AC circuits. Calculate power in watts from current in amps and voltage. Free electrical calculator.
Watts to Amps Calculator
Convert watts to amps for any voltage. Calculate current draw from power rating. DC and AC (single/three phase) supported.
kWh Calculator
Calculate kilowatt hours (kWh) from watts and hours. Find energy consumption and electricity cost for any appliance.
Power Factor Calculator
Calculate power factor from kW and kVA. Convert between apparent power (VA), real power (W), and reactive power (VAR).
Amps to kW Calculator
Convert amps to kilowatts for single-phase and 3-phase AC circuits. Enter current, voltage, and power factor to calculate real power in kW.
Amps to kVA Calculator
Convert amps to kVA for single-phase and 3-phase systems. Calculate apparent power from current and voltage for generator and UPS sizing.
Amps to VA Calculator
Convert amps to volt-amperes (VA) for single-phase and 3-phase circuits. Calculate apparent power for circuit breaker and wiring sizing.
Amps to Volts Calculator
Calculate voltage from current and power (V = W/A) or from current and resistance (V = I×R). Solve Ohm's Law for voltage from known amps.
kVA to Amps Calculator
Convert kVA to amps for single-phase and 3-phase systems. Essential for sizing generator connections, transformer secondaries, and electrical panels.
kVA to Watts Calculator
Convert kVA to watts using power factor. Calculate real power output from apparent power rating for generators, UPS systems, and transformers.
kVA to kW Calculator
Convert kVA to kW using power factor. Calculate real power (kW) from apparent power (kVA) for electrical equipment sizing and energy analysis.
kVA to VA Calculator
Convert kVA to VA instantly. Simple unit conversion: 1 kVA = 1,000 VA. Used for comparing equipment ratings across different unit conventions.
kW to Amps Calculator
Convert kilowatts to amps for single-phase and 3-phase AC systems. Calculate circuit current from real power, voltage, and power factor for electrical planning.
kW to Volts Calculator
Calculate voltage from kilowatts and current using V = (kW × 1000) / (A × PF). Determine system voltage from known power and current measurements.
kW to kWh Calculator
Convert kilowatts (power rate) to kilowatt-hours (energy consumed) by multiplying by hours of operation. Calculate energy consumption from appliance power ratings.
kW to VA Calculator
Convert kilowatts to volt-amperes using power factor. Calculate apparent power (VA) needed for UPS sizing, wiring, and transformer selection from real power load.
kW to kVA Calculator
Convert kilowatts to kVA using power factor. Calculate apparent power rating needed for generator and transformer selection from real power requirements.
kWh to kW Calculator
Convert kilowatt-hours to kilowatts by dividing by hours. Calculate the average power draw from energy consumption and time data.
kWh to Watts Calculator
Convert kWh to watts by dividing energy by hours and multiplying by 1000. Find the average wattage of a device from its energy consumption.
Electricity Bill Calculator
Calculate electricity cost for any appliance or device. Enter watts, daily usage hours, and your electricity rate to find daily, monthly, and annual cost.
Energy Consumption Calculator
Calculate total household energy consumption by adding multiple appliances. Enter watts and daily hours for each device to find total kWh and monthly electricity cost.
Energy Cost Calculator
Calculate annual electricity cost from total kWh usage and rate. Supports time-of-use (TOU) pricing with separate peak and off-peak rates for accurate billing.
Volts to Amps Calculator
Calculate current in amps from voltage and power (A = W/V) or voltage and resistance (A = V/R). Solve for current using Ohm's Law or the power formula.
Volts to Watts Calculator
Calculate power in watts from voltage and current using W = V × A. Find the power consumption of any electrical load from its voltage and current draw.
Volts to kW Calculator
Convert volts to kilowatts using voltage, current, and power factor. Calculate real power in kW from measured voltage and current for single-phase and 3-phase systems.
Volts to Joules Calculator
Convert volts to joules using charge (J = V × Q). Calculate electrical energy stored or transferred at a given voltage for capacitors, batteries, and circuit analysis.
Watts to Joules Calculator
Convert watts to joules by multiplying power by time in seconds. Calculate energy in joules from any wattage and duration for physics and engineering applications.
Watts to kWh Calculator
Convert watts to kilowatt-hours by multiplying by hours and dividing by 1000. Calculate energy consumption and electricity cost for any appliance from its wattage.
Watts to Volts Calculator
Calculate voltage from watts and current (V = W/A) or from watts and resistance (V = √(W×R)). Find circuit voltage from known power and current or resistance.
Watts to VA Calculator
Convert watts to volt-amperes (VA) using power factor. Calculate the apparent power demand of a load for UPS sizing, wiring, and transformer selection.
Joules to Watts Calculator
Convert joules to watts by dividing energy by time in seconds. Calculate average power output from energy measurements in joules for physics and engineering.
Joules to Volts Calculator
Convert joules to volts using charge in coulombs (V = J/Q). Calculate voltage from electrical energy for capacitor analysis, battery chemistry, and physics problems.
VA to Amps Calculator
Convert volt-amperes to amps for single-phase and 3-phase systems. Calculate current draw from VA-rated equipment like UPS systems and power supplies.
VA to Watts Calculator
Convert volt-amperes to watts using power factor. Calculate real power consumption from VA-rated equipment for energy billing and efficiency analysis.
VA to kW Calculator
Convert volt-amperes to kilowatts using power factor. Calculate real power in kW from VA equipment ratings for energy billing and electrical engineering.
VA to kVA Calculator
Convert VA to kVA instantly. Simple unit conversion: 1 kVA = 1,000 VA. Essential for comparing small UPS units (VA) with larger electrical equipment (kVA).
eV to Volts Calculator
Convert electronvolts (eV) to volts. Calculate the voltage equivalent of particle energy in eV for physics, semiconductor engineering, and radiation applications.
Voltage Divider Calculator
Calculate the output voltage of a resistor voltage divider circuit. Enter Vin, R1, and R2 to find Vout, current, and power dissipation in each resistor.
Power Calculator
Calculate electrical power using any two of four quantities: voltage, current, resistance, or power. Uses all three Ohm's Law power forms: P=VI, P=I²R, P=V²/R.
Lumens to Watts Calculator
Convert lumens to watts for any bulb type — LED, CFL, halogen, or incandescent. Find how many watts you need for any desired brightness level.
Watts to Lumens Calculator
Convert watts to lumens for LED, CFL, halogen, and incandescent bulbs. Find the brightness output from any wattage using luminous efficacy values.
Lumens to Lux Calculator
Convert lumens to lux by dividing by the illuminated area. Calculate illuminance levels for room lighting design, photography, and building standards compliance.
Lux to Lumens Calculator
Convert lux to lumens by multiplying by the illuminated area. Calculate total lumens required to achieve a target illuminance level for room or outdoor lighting.
Lux to Watts Calculator
Calculate the watts needed to achieve a target lux level over a given area. Essential for lighting design, energy compliance, and estimating power consumption for any light level.
Watts to Lux Calculator
Calculate the lux illuminance produced by a light fixture from its wattage, efficacy, and the illuminated area. Plan lighting levels for any room or outdoor space.
Candela to Lumens Calculator
Convert candela to lumens using solid angle in steradians. Calculate total luminous flux from luminous intensity for LED datasheets, spotlights, and directional sources.
Lumens to Candela Calculator
Convert lumens to candela using beam angle or solid angle. Calculate luminous intensity for LED lighting design, stage lighting, automotive headlamps, and photometric reports.
Candela to Lux Calculator
Calculate illuminance (lux) from luminous intensity (candela) at any distance using the inverse square law: Lux = cd / d². Used in photography, stage lighting, and safety lighting.
Lux to Candela Calculator
Calculate luminous intensity (candela) from illuminance (lux) and distance using cd = Lux × d². Find the required candela for a spotlight or flashlight at a given distance.
Footcandles to Lux Calculator
Convert footcandles to lux instantly. 1 footcandle = 10.764 lux. Essential for converting US lighting specifications to international SI units for global projects.
Lux to Footcandles Calculator
Convert lux to footcandles for US lighting applications. 1 lux = 0.0929 footcandles. Convert international lighting standards to US specifications.
Millicandela to Lumens
Convert millicandela (mcd) to lumens for LED components and indicator lights. Calculate luminous flux from LED datasheets that specify intensity in millicandela.
Lumens to Millicandela
Convert lumens to millicandela for LED specification work. Calculate the luminous intensity in mcd from total flux and beam solid angle for LED datasheets.
Wire Gauge Calculator
Find the correct AWG wire gauge for any electrical load. Enter current (amps) and circuit length to get NEC-compliant wire size with voltage drop analysis.
AWG to mm Calculator
Convert American Wire Gauge (AWG) to millimetres diameter and mm² cross-section. Full table for all standard AWG sizes with resistance and current ratings.
SWG to mm Calculator
Convert Standard Wire Gauge (SWG) to millimetres. British Standard Wire Gauge (BS 3737) conversion table for UK, Australian, and Commonwealth electrical and metalworking applications.
About Our Electrical Calculators
CalcProTool's electrical calculators are designed for users in the USA, UK, Canada, Australia, and Europe. Every calculator uses verified formulas, updates in real time, and requires no registration. All 56 tools in this category are completely free.
Each calculator page includes a full explanation of the formula used, step-by-step guidance, and answers to frequently asked questions. Our tools are designed to help you make informed decisions with confidence.