Ohm's Law & Circuit Calculator
Ohm's law and power, series and parallel resistors and capacitors, voltage dividers and LED resistors. Free, no sign-up, and it runs in your browser — your files are never uploaded.
How to use
- Pick a calculator
- Enter the values you know — prefixes like 4.7k and 20m work
- Read the rest instantly
Questions
Do I need an account?
No. Every tool is free to use without signing up.
Is my data uploaded?
No. This tool runs in your browser, so the text and files you use stay on your device.
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