#1
Amps-to-Watts Calculator
Convert amps to watts for DC, single-phase AC, and three-phase AC circuits using voltage and power factor with instant formula-based results.
#2
Appliance Energy Cost Calculator
Estimate appliance electricity use and running cost by wattage, usage time, quantity, standby power, duty cycle, tariff, and carbon factor.
#3
Battery Runtime Calculator
Use this Battery Runtime Calculator to estimate battery backup time from capacity, voltage, load, efficiency, depth of discharge, and battery quantity.
#4
Capacitor Calculator
Calculate capacitance, stored energy, charge, RC time constant, cutoff frequency, equivalent capacitance, and AC capacitor size with formulas.
#5
Circuit Breaker Size Calculator
Calculate a recommended circuit breaker size from load current or power. Supports DC, single-phase, three-phase, continuous loads and standard ratings.
#6
Generator Size Calculator
Calculate the right generator size in kW and kVA using appliance loads, starting watts, power factor and a safety margin for home or business use.
#7
kVA-to-Amps Calculator
kVA to Amps Calculator converts VA, kVA or MVA to amps for single- and three-phase AC using voltage, phase type and the appropriate electrical formula.
#8
LED Resistor Calculator
Calculate the correct resistor for single LEDs, series strings, or parallel branches. Get a standard resistor value, wattage, current, and circuit details.
#9
Ohm’s Law Calculator
Ohm's Law Calculator solves voltage, current, resistance and power from any two known values, with unit conversion, formulas and clear working steps.
#10
Power Factor Calculator
Calculate power factor, phase angle, kVA, kVAR, and correction requirements using real power, apparent power, reactive power, voltage, or current.
#11
Resistor Color Code Calculator
Use the Resistor Color Code Calculator to decode 4, 5, and 6-band resistors and calculate resistance, tolerance, and temperature coefficient.
#12
Three-Phase Power Calculator
Calculate three-phase real power, apparent power, reactive power, current, or voltage using line values and power factor with instant results.
#13
Transformer Calculator
Calculate transformer voltage, current, turns ratio, winding turns, VA rating, real power, efficiency loss, and single- or three-phase load current.
#14
Voltage Drop Calculator
Use our Voltage Drop Calculator to estimate voltage loss, percentage drop, required cable size, and power loss for DC, single-phase, and three-phase circuits.
#15
Watts-to-Amps Calculator
Convert watts to amps for DC, single-phase AC, and three-phase AC circuits using voltage and power factor with clear formulas and instant results.
#16
Wire Size Calculator
Use this free Wire Size Calculator to estimate AWG, cable area, voltage drop, ampacity, and power loss for copper or aluminum wiring.
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