Pick your Connection Type (series or parallel), enter up to three Resistor Values with their Units, and the Resistor Network Calculator gives you the Equivalent Resistance of the combined network, plus Total Power and Current Draw both calculated at a baseline of 1V.
Equivalent Resistance
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Total Power (at 1V)
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Current Draw (at 1V)
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In series connections, resistors are connected end-to-end and the total resistance equals the sum of all resistances. In parallel connections, resistors are connected side-by-side and the reciprocal of total resistance equals the sum of reciprocals of individual resistances.
For parallel resistors, use the formula: 1/Req = 1/R1 + 1/R2 + 1/R3 + ... The equivalent resistance is always less than the smallest individual resistor value.
For series resistors, simply add all resistance values: Req = R1 + R2 + R3 + ... The total resistance is always greater than any individual resistor.
The calculator supports microohms (µΩ), milliohms (mΩ), ohms (Ω), kiloohms (kΩ), and megaohms (MΩ). You can mix different units for different resistors.
This calculator supports up to 6 resistors in a single series or parallel configuration. For larger networks, you can break them down into smaller groups and calculate step by step.
In parallel connections, current has multiple paths to flow through. More paths mean less overall resistance, so the equivalent resistance is always less than the smallest individual resistor.
The calculator provides high precision results with up to 6 decimal places. It handles very small (microohm) and very large (megaohm) resistance values accurately.
The calculator shows the current draw and power dissipation when 1 volt is applied across the network. This helps you understand the electrical characteristics of your resistor combination.