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Series and parallel calculator
Total resistance, capacitance or inductance for parts in series or parallel.
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About Series and parallel calculator
Combine resistors, capacitors or inductors in series or parallel. Resistors in series add up, while in parallel the total is the reciprocal of the sum of reciprocals. Capacitors work the opposite way: they add in parallel. Two equal resistors in parallel give exactly half the value.
How to use Series and parallel calculator
- Enter your numbers above.
- The result updates instantly as you type.
- Change any value to compare different cases.
Why use this tool?
- Private: everything happens in your browser. Nothing you enter is uploaded.
- Free, with no sign-up, no watermark and no limit on how often you use it.
- Works on phones, tablets and computers: Android, iPhone, Windows, Mac and Linux. Nothing to install.
- Available in 10 languages.
Also known as
Frequently asked questions
Why is parallel resistance always lower than the smallest resistor?
Each extra path gives current another way to flow, so the combined resistance falls below even the smallest single branch.
Is Series and parallel calculator free?
Yes. Series and parallel calculator on Toolipedia is free to use, with no sign-up and no watermark.
Is it safe to use?
Yes. Everything is worked out in your browser, and nothing you enter is sent to our server.
Does it work on my phone?
Yes. It works in any modern browser on Android and iPhone, as well as on tablets and computers. There's nothing to install.
Do I need an account?
No. Just open the page and use the tool. There's no sign-up and no email needed.