Series & parallel resistor calculator
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Resistor configuration
Results — series
Equivalent resistance
Req = R1 + R2 + …
Voltage share across R1 (at 5 V)
V1 = 5 × R1 / Req
Voltage share across R2 (at 5 V)
V2 = 5 × R2 / Req
Nearest standard E24 value
0% above your value
About the model
In series the resistors add: Req = R1 + R2 + …; the same current flows through each, so each drops a share of the total voltage and the chain is only as strong as its weakest single resistor. In parallel the conductance adds: for two resistors Req = (R1 × R2) / (R1 + R2), or 1/Req = 1/R1 + 1/R2 for any number — each leg carries its own current, and the combination can handle the sum of the individual power ratings.
The nearest E24 value is the nominal value from the E-series you would reach for in a parts bin — remember real parts carry a tolerance (5% for E24). Picking a pair? Browse resistors, resistor networks and resistor kits in our catalog.
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