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Voltage divider calculator
Output voltage of a two-resistor divider, or the resistors for a target voltage.
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About Voltage divider calculator
Calculate the output of two resistors in series across a supply, using Vout equals Vin times R2 divided by (R1 plus R2). You can also find resistor values for a target voltage, such as dropping 5 V to 3.3 V for a sensor input. Light loads only, since the load changes the output.
How to use Voltage divider 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
Can I use a voltage divider to power a device?
Not well. The output drops as the load draws current. Use dividers for signals and reference voltages, and a regulator for power.
Is Voltage divider calculator free?
Yes. Voltage divider 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.