About the Series Resistance Calculator
Total resistance of resistors in series, with the voltage dropped across each one.
Also known as: resistors in series, total resistance series, add resistors.
How to use this calculator
- Enter r1, r2, r3, r4 and the other fields.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
R_total = R₁ + R₂ + R₃ + …
Worked example
Using the values pre-filled in the calculator above:
- R1 = 100 Ω
- R2 = 220 Ω
- R3 = 470 Ω
- R4 = 0 Ω
- Supply voltage (optional) = 12 V
the calculator returns:
- Total resistance: 790 Ω
- In kilohms: 0.79
- Current: 0.01519 A