Electrical Calculator
Solve Ohm's law and power from any two known values.
Everything is calculated in your browser. Nothing you enter is sent anywhere.
Tool
Ohm's law calculator
Enter exactly two known values. Leave the other two empty — they will be calculated.
Two values entered — ready to calculate.
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About the electrical calculator
Solve Ohm's law and power relationships when you know any two of voltage, current, resistance, and power. Enter exactly two values and leave the rest blank.
How it works
The tool uses V = IR and P = VI (and their algebraic rearrangements) to solve for whichever two quantities you did not supply. All six valid pairs of known values are supported.
When to use it
Handy for quick checks on resistive loads, heater circuits, and basic DC power supplies. Useful when you know two measurements from a multimeter and need the rest.
Limitations
This is a DC / purely resistive model. It does not account for AC reactance, power factor, harmonics, motor starting currents, or three-phase circuits. Do not use it for code compliance, breaker sizing, or motor-drive design without proper engineering analysis.
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All calculations run locally in your browser. Nothing you type is sent to a Dockzio server.
FAQ
Quick answers to common questions.