Resistance Series Calculator

Summary

Add up to 10 resistors and instantly calculate their total series resistance with unit conversion.

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