// multi-utility computation suite · offline · instant · precise
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eng.voltage-divider Calculator
Calculates output voltage from a resistive voltage divider from supply voltage and the two resistor values. A voltage divider with equal resistors gives exactly half the supply voltage — this is the simplest analogue signal scaling circuit.
Inputs
V In
Electric potential difference (V). Drives current through a circuit. Household: 120 V (US) or 230 V (EU/UK).
R1 Ohm
Reference formula or conversion factor shown for context.
R2 Ohm
Reference formula or conversion factor shown for context.
Load Ohm
Opposition to current flow (Ω). V = IR. Resistors in series add; in parallel their reciprocals add.
Results
output voltage (V)
Electric potential difference between the two terminals (V). In AC systems, quoted as RMS — 230 V mains has a peak of ~325 V.
current (mA)
Electric charge flow rate (A). Governs wire sizing — too much current causes dangerous heating. Fuses protect circuits from overcurrent.
effective R2 (with load)
Reference formula or conversion factor shown for context.