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Calculate Ohm's law, resistor color codes, wire gauges, LED resistors, voltage dividers, and PCB trace widths.
Targeted at electronics hobbyists, electrical engineering students, and hardware prototypers who need quick reference calculations at the bench. Decode resistor bands, size wires for safe current handling, design voltage dividers, and estimate PCB trace widths to meet IPC standards. Keep these bookmarked for your next breadboard session.
Calculate voltage, current, resistance, and power using Ohm's Law. Enter any two values to find the rest.
Decode 4-band and 5-band resistor color codes to get resistance values, or enter a value to get the color bands.
Calculate the recommended AWG wire size based on current, voltage, distance, and acceptable voltage drop.
Calculate the correct resistor value for LEDs based on supply voltage, LED specs, and series/parallel configuration.
Calculate output voltage or resistor values for a voltage divider circuit with a visual diagram.
Calculate minimum PCB trace width using the IPC-2221 standard based on current, copper weight, and temperature rise.
The engineering category is built for fast reference calculations during electronics study, troubleshooting, prototyping, and bench work.
These tools are useful for first-pass validation of formulas and relationships before you move into a simulator, datasheet review, or production design workflow.
Popular picks in this category include Ohm's Law Calculator.
Calculate voltage, current, resistance, and power using Ohm's Law. Enter any two values to find the rest.
Always verify engineering outputs against datasheets, tolerances, units, and real-world constraints before building or shipping anything based on them.