Enter any two parameters below and click calculate to get the other two.
Ohm’s law describes the relationship between voltage, current, and resistance: U = I × R.
Electrical power measures energy conversion rate. Common formulas include P = U × I, P = I² × R, and P = U² / R.
With any two parameters known, the remaining two can be derived from the formula set, which is helpful for quick circuit estimation.
Keep units consistent: resistance in ohms, current in amperes, voltage in volts, and power in watts.
U = I × R.
I = U ÷ R.
P = I² × R.
P = U × I.
I = P ÷ U.
R = P ÷ I².
There are only two independent relationships, so two values uniquely determine the other two.
Yes, electrical calculations often produce decimals, and the tool keeps practical precision.
Results will be off, for example mixing mA and A creates a 1000× error.
Use it for circuit design, power estimation, component selection, learning, and lab calculations.
Provide any two parameters and automatically derive the other two for circuit analysis.
Scan to continue on mobile.