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Electrical & Electronics
Browse 12 working calculators for electrical & electronics. Every tool shows a live result, its calculation steps, and the sources behind the method.
Electrical
12 calculators
Volt Ampere CalculatorConverts between watts, amps, volts and volt-amps for DC and single-phase AC circuits, including the power factor that separates real from apparent power.Voltage Drop CalculatorCalculates conductor voltage drop, percentage drop and voltage at the load for a copper or aluminium circuit, and the smallest conductor that keeps the drop inside a chosen limit.Ohm Law CalculatorSolves Ohm's law and the power relation for voltage, current, resistance and power from any two known quantities.Size Electrical Wire CalculatorSizes copper or aluminium conductors from load current, run length and voltage-drop allowance, derates ampacity for ambient temperature and bundling, looks up equipment grounding conductors, and converts sheet-metal gauge numbers to thickness.Voltage Divider Formula CalculatorComputes the output of a resistive voltage divider, or how a total current splits between two parallel resistors.Parallel Circuit Resistor CalculatorComputes the equivalent resistance of resistors in parallel, in series, or as a parallel bank in series with others, plus the conductance and the branch currents at a chosen supply voltage.Voltage Drop Southwire CalculatorCalculates conductor voltage drop, percentage drop and voltage at the load for a copper or aluminium circuit, and the smallest conductor that keeps the drop inside a chosen limit.Resistor CalculatorReads a 3, 4, 5 or 6 band resistor colour code into a resistance, tolerance, temperature coefficient and value range, and writes the band colours for a resistance you name.Cost Electricity CalculatorWorks out the energy an appliance consumes over a period and what it costs at a given tariff, in kilowatt-hours.LED Resistor CalculatorSizes the series current-limiting resistor for one or more LEDs from the supply voltage, the LED forward voltage and the wanted forward current, and reports the power the resistor must dissipate.Microstrip Impedance CalculatorSizes a printed-circuit conductor from current and temperature rise using IPC-2221, reports its current capacity, DC resistance and voltage drop, and computes microstrip / stripline single-ended and differential impedance and propagation delay per IPC-2141A.Three Phase Power CalculatorComputes real, apparent and reactive power in a balanced three-phase system from line voltage, line current and power factor.