Voltage Divider Calculator
Calculate output voltage, find R1 or R2 for any voltage divider — includes load effects, E24 standard resistor matching, and circuit diagrams
Parameters
10 kΩ
10 kΩ
Formulas
Vout = Vin × R2 / (R1 + R2)R2_eff = R2 ∥ R_load = R2×R_L/(R2+R_L)I = Vin / (R1 + R2_eff)Common Voltage Divider Configurations
| Vin | Vout | R1 | R2 | Use Case |
|---|---|---|---|---|
| 5V | 3.3V | 5.1 kΩ | 10 kΩ | 5V → 3.3V logic level |
| 12V | 5V | 14 kΩ | 10 kΩ | 12V → 5V ADC reference |
| 12V | 2.5V | 38 kΩ | 10 kΩ | Battery monitor ADC input |
| 24V | 3.3V | 62 kΩ | 10 kΩ | 24V industrial → MCU |
| 9V | 5V | 8.2 kΩ | 10 kΩ | 9V battery → 5V sense |
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