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Voltage divider calculator

Computes divider output voltage, current, and dissipation, shows the load effect, and finds resistor pairs for a target output.

Enter a supply and two resistors to divide it.

Vout = Vin times R2 over R1 + R2, taken between the resistors. A load in parallel with R2 shrinks the bottom resistance and drags the output down, which is why a divider feeding anything but a high impedance input needs its load in the math. Real resistors add tolerance on top: the ratio of two 1 percent parts is not 1 percent accurate in the worst case, it is up to 2 percent off. And a divider wastes power the whole time it is powered, so for battery work pick the largest resistances your input current budget allows.
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