Series resistors
Req = R1 + R2 + ...
Electrical calculator
Series & Parallel Resistor / Capacitor Calculator
Enter comma-separated component values to find equivalent totals.
Calculator
Enter values
Results update automatically as you type.
Result
About this calculator
How it works
Series and parallel combinations behave differently for resistors and capacitors. This calculator handles both component types.
Formulas
Formulas used
Parallel resistors
1 / Req = 1 / R1 + 1 / R2 + ...
Series capacitors
1 / Ceq = 1 / C1 + 1 / C2 + ...
Parallel capacitors
Ceq = C1 + C2 + ...
Guide
How to use this calculator
- Choose the mode or component type if the calculator provides one.
- Enter known values and select the units beside each input.
- Read the highlighted result first, then use the table for supporting calculated values.
Reference
What the results mean
Equivalent value
The single component value that behaves like the entered network.
FAQ
Series & Parallel Resistor / Capacitor Calculator questions
Can I use different units?
Yes. Select the unit beside each input. The calculator converts values internally before solving.
Are the results suitable for final design?
Use results for education, screening, and early design checks. Verify final work against standards, datasheets, and project requirements.
Why does the result update automatically?
The calculator listens for input changes and recalculates as soon as enough valid values are available.
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