Resistance Series Calculator

Summary

The Resistance Series Calculator computes the total resistance of multiple resistors wired in series. In a series circuit, the total resistance is simply the sum of all individual resistances — making this one of the most straightforward calculations in electronics. Enter each resistor value in your preferred unit (ohms, kilohms, or megaohms) and the tool will instantly display the combined resistance.

How it works

1. Enter the value of the first resistor and select its unit (Ohms, Kilohms, or Megaohms).
2. Click "Add Resistor" to insert additional resistors as needed (up to 10).
3. All values are converted to ohms internally and summed.
4. The total resistance is displayed in the most readable unit automatically.
5. Remove any resistor by clicking the delete button next to it.
6. Click "Reset" to start over with a fresh set of inputs.

Use cases

• Calculate the combined resistance of a resistor ladder network.
• Verify series resistor values when designing current-limiting circuits.
• Sum resistor tolerances to estimate worst-case total resistance.
• Quickly convert mixed ohm/kilohm/megaohm resistor values into a single total.
• Educational use: verify textbook series-resistance problems.
• Prototype LED current-limiting resistor chains.
• Plan pull-up or pull-down resistor dividers for microcontroller inputs.
• Calculate bias resistor chains for transistor base networks.

Frequently Asked Questions