1 tool
Electronics calculators
Ideal circuit formulas are useful starting points, but connected circuits can change the answer. These tools expose loading, source impedance, current and component dissipation so the result remains tied to a real circuit model.
Resistor networks
Analyze ideal and loaded divider behavior, output resistance and resistor power.
Voltage Divider Calculator
Calculate more than the ideal R2 ÷ (R1 + R2) ratio. Add source and load resistance to see the real output shift, branch currents, output impedance and resistor dissipation.
Methodology
How these tools are built
Every calculator here shows the formula it uses, the assumptions behind it and the limits of the model. Where a figure is a typical published value rather than a specification, it says so and lets you change it.