Ohm's Law Calculator
Enter the known values and run the calculation.
Enter the known values and run the calculation.
The tool uses the two most recently edited populated fields as inputs and solves for the remaining term using the standard algebraic rearrangement of Ohm's law.
Overview
Solve for voltage, current, or resistance from the standard electrical relationship.
Use this tool to solve the basic voltage-current-resistance relationship from any two known values.
Use it for quick bench checks, introductory circuit math, and troubleshooting when you need the missing electrical quantity right away.
The math and how it's used
Rearranged forms are I = V / R and R = V / I.
The tool uses the two most recently edited populated fields as inputs and solves for the remaining term.
Engineers mostly use this as a fast bench relationship: if two of the three terms are known, the third should fall out immediately and tell you whether the measurement is even plausible.
It is still a lumped resistive model. Reactive impedance, temperature rise, non-ohmic devices, and waveform shape are outside what this shortcut can tell you.
What to watch
This is the lumped DC relationship. Complex impedance, waveform shape, non-ohmic behavior, and temperature dependence are outside the model.
If all three fields are populated, the tool recalculates from the two most recently edited inputs and overwrites the remaining value.