Voltage Divider Calculator
Calculate unloaded or loaded resistor-divider output voltage and branch current.
Enter your values
How to use Voltage Divider Calculator
- Enter Input voltage (V), R1 (Ω), R2 (Ω), Load resistance (Ω).
- Choose the options that match your task and leave genuinely optional fields blank when they do not apply.
- Select Calculate / Run and review the result panel.
- Check units, assumptions and any limitations shown on the page before using the result for an important decision.
About this tool
Calculate unloaded or loaded resistor-divider output voltage and branch current. Use the form above to enter Input voltage (V), R1 (Ω), R2 (Ω), Load resistance (Ω). The calculation or transformation runs locally in your browser.
Method
Unloaded output is Vin × R2 ÷ (R1 + R2). If a load is entered, the tool first combines that load in parallel with R2.
Frequently asked questions
What does Voltage Divider Calculator do?
Calculate unloaded or loaded resistor-divider output voltage and branch current.
What information do I need?
The form is built around these inputs: Input voltage (V), R1 (Ω), R2 (Ω), Load resistance (Ω).
Does my input get uploaded?
For this tool, the calculation or transformation runs in your browser. Your entered values are not intentionally sent to ToolboxKart for processing.
Is this tool free to use?
Yes. You can use this ToolboxKart tool without creating an account.