Watts Amps Volts Calculator
Solve P, I or V from two supplied quantities for DC or a purely resistive load.
Inputs 0.000001–1000000000 in W, A or V. Positive magnitudes only. P=VI applies to DC or purely resistive AC with consistent RMS values. Excludes power factor, reactive loads, three-phase systems and safety assessment. Only the two relevant fields are used.
P = VI; I = P/V; V = P/I
Result
A QUICK WALKTHROUGH
How to use this tool
- Choose the mode and enter the values.
- Read the formula and limitations before interpreting the result.
Formula and limits
Inputs 0.000001–1000000000 in W, A or V. Positive magnitudes only. P=VI applies to DC or purely resistive AC with consistent RMS values. Excludes power factor, reactive loads, three-phase systems and safety assessment. Only the two relevant fields are used. P = VI; I = P/V; V = P/I
GOOD TO KNOW
Common questions
Does this evaluate a real component or circuit?
No. This is a nominal calculation from the inputs, not component selection or a safety assessment.