Voltage Divider Calculator

The output is taken across R2, the bottom resistor:

V_out = V_in × R2 ÷ (R1 + R2)

The same current flows through both resistors: I = V_in ÷ (R1 + R2). Smaller total resistance means a stiffer divider (less affected by the load) but more wasted power; larger values save power but are more sensitive to loading. A common rule of thumb is to make the divider current about 10× the current drawn by the load.

The standard-pair mode scans all E24 × E24 combinations (and the E12 subset) to find the pair whose ratio is closest to your target, which is often more accurate than rounding each resistor separately.