Technology
Two-branch current divider
Split a known total current between two parallel resistive branches.
Calculators / Technology / Resistive voltage divider
Resistive voltage divider calculator
Find the unloaded output voltage of a two-resistor voltage divider.
On this page
Output voltage8V
Divider current4.00e-3A
Calculator controls
How to calculate
Find the unloaded output voltage of a two-resistor voltage divider.
Output voltage = v*b/(a+b) V; Divider current = v/(a+b) A
Worked example
Input voltage (V): 12; Upper resistance (Ω): 1000; Lower resistance (Ω): 2000.
Output voltage: 8 V; Divider current: 4.00e-3 A.
Assumptions and limits
Uses ideal components and the units shown. This calculation does not establish component ratings, wiring safety or regulatory compliance. Loading the output changes the divider ratio.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
Find the unloaded output voltage of a two-resistor voltage divider.
When this tool is useful
Output voltage = v*b/(a+b) V; Divider current = v/(a+b) A
Understanding your inputs
| Input | What to enter |
|---|---|
| Input voltage (V) | Enter a number of at least -1000000000000 and no more than 1000000000000. |
| Upper resistance (Ω) | Enter a number of at least 0 and no more than 1000000000000. |
| Lower resistance (Ω) | Enter a number of at least 0 and no more than 1000000000000. |
Frequently asked questions
What assumptions does this calculation use?
Uses ideal components and the units shown. This calculation does not establish component ratings, wiring safety or regulatory compliance. Loading the output changes the divider ratio.
How is the result calculated?
Output voltage = v*b/(a+b) V; Divider current = v/(a+b) A