Electronics & Electrical tools
Free electronics and electrical calculators on toolcan for circuits, components, wiring, and power. Each runs entirely in your browser, with nothing to install.
Popular Electronics & Electrical tools
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Resistor Color Code Calculator
Decode 4-, 5-, and 6-band resistor color codes into resistance, tolerance, and temperature coefficient — or read the bands for a value. Calculates in your browser.
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Voltage Divider Calculator
Calculate the output voltage of a two-resistor voltage divider, or size the resistors to hit a target output. Calculates in your browser.
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LED Resistor Calculator
Work out the series resistor an LED needs from supply voltage, forward voltage, and forward current — plus the power the resistor dissipates. Calculates in your browser.
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AWG Ampacity Calculator
Look up the diameter, cross-section, and resistance of an American Wire Gauge size and see a guideline current-carrying capacity. Calculates in your browser.
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Wire Size Calculator
Find the wire gauge that keeps voltage drop within limit for a circuit, from the current, one-way distance, voltage, conductor metal, and phase. Calculates in your browser.
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Conduit Fill Calculator
Check NEC conduit fill (total conductor area versus the allowed percentage for EMT) from your wire gauges and counts, with a pass or fail. Calculates in your browser.