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Combine resistors in series, parallel, or an arbitrary +/| expression, with per-resistor voltage and power
Details
Combine a list of resistors into one equivalent resistance.
Modes:
Value suffixes: k/K, M, m, u/µ. With an optional voltage, total current and per-resistor power are reported.
Execution
Fill in the form, run the tool, and review the result in one place.
Samples
Related
Tool usage guide
The Resistor Series / Parallel Calculator computes the total equivalent resistance for component networks arranged in series, in parallel, or defined through custom mathematical expressions. It also calculates overall circuit current and individual resistor power dissipation when an operating voltage is provided.
Background
Building an LED current-limiting circuit using several resistors in series to reach a specific resistance target.
Problem
Needs to know the combined resistance of three discrete resistors wired end-to-end.
How to use
Select 'Series' mode, enter the component values line-by-line, and run the calculation.
mode: series
rawValues: 1000
2200
4700Outcome
Calculates an equivalent resistance of 7.9 kΩ (7900 Ω).
Background
Designing an analog front-end biasing network powered by a 12V DC rail.
Problem
Needs equivalent network resistance and power dissipation across parallel branches to choose appropriate SMD package sizes.
How to use
Select 'Expression' mode, enter the network topology formula, and provide the 12V supply voltage.
You can use 'u' or 'µ' for micro-ohms, 'm' for milli-ohms, 'k' or 'K' for kilo-ohms, and 'M' for mega-ohms.
Use '+' to denote series connections, '|' to denote parallel connections, and parentheses '()' to define grouping and precedence.
The calculator determines the total equivalent resistance without generating current draw or power dissipation metrics.
Yes, you can separate individual resistance values using commas, spaces, or line breaks.
Yes, providing an applied voltage calculates the total circuit current as well as individual resistor voltage drops and wattage.
mode: expr
rawValues: (10k|10k)+470
voltage: 12Outcome
Returns an equivalent resistance of 5.47 kΩ along with total current and individual resistor power dissipation.