WHAT IT DOES
Total the resistor list you actually have on the bench.
Add any number of resistor values and calculate their series sum or parallel equivalent. A shared per-part tolerance gives transparent worst-case endpoints, and an optional supply adds total and per-resistor power figures.
Why use it?
Use it to compare series and parallel combinations and estimate how the total resistance and individual power change.
How to use this tool
- Enter each resistor value and choose Series or Parallel. Add the shared tolerance and supply voltage only when needed.
- Calculate and review the equivalent resistance and optional per-part power. Two 1 kΩ resistors yield 2 kΩ in series or 500 Ω in parallel.
- Use the tolerance endpoints as worst-case bounds, not a probability estimate. A mixed network must be reduced in appropriate stages rather than entered as one all-series or all-parallel list.
Details and limitations
- Series resistance is summed directly; parallel resistance is calculated from the sum of reciprocal conductances.
- Tolerance bounds put every resistor at the same low or high endpoint. They are deterministic worst cases, not a probability estimate or Monte Carlo distribution.
- For series power the same current flows through every part; for parallel power the full stated voltage is applied to every branch.