About Current Calculator
A free, private tool that turns power, voltage, resistance, and power factor into a clear answer in amps, with the working shown every time.
Built to Make Current Simple
Current Calculator started with a small frustration. Too many electrical calculators either hide the formula, force you through a signup, or bury the answer under adverts. We wanted the opposite: type a few numbers, get the amps, and see exactly how the result was reached.
So we built a single tool that covers the calculations people actually reach for. Ohm's law for a simple resistive circuit. Current from power and voltage for a rated device. Single phase and three phase AC for real installations, complete with power factor. Every mode shows its equation, so the tool teaches while it calculates.
It runs entirely in your browser. Nothing you type is uploaded, and there is no account to create. We think a reference tool should respect your time and your privacy in equal measure.
The Principles Behind the Tool
Four commitments shape every decision, from the interface to the guides we publish.
Accuracy
We use the standard, textbook formulas and state our assumptions clearly, so you know exactly what the numbers mean.
Privacy
Calculations run on your device. We do not upload your figures or track the values you enter into the calculator.
Clarity
Every result shows the equation and the numbers behind it, because a good tool should help you understand, not just answer.
Access
Free, fast, and usable on any device, with keyboard support and readable contrast for everyone.
A Tool People Rely On
How We Write Our Guides
Our blog explains current, Ohm's law, power factor, and three phase supplies in plain language, checked against standard electrical references. We aim for helpful and honest rather than exhaustive, and we say when a figure is an estimate. Read the full standards in our editorial policy, and reach out any time through our contact page.
Try the Current Calculator
See how power, voltage, and power factor come together to give you the current in amps.