Series Resistor Calculator

Your details

Comma- or space-separated list of resistor values (up to any count) in the unit chosen below.
Every value in the list is read in this unit. The total is shown in ohms and auto-scaled.
Worst-case spread of the total if every resistor sat at the same end of its tolerance band.
Turn on to also get the loop current and each resistor's voltage drop and power.
The voltage applied across the whole series chain.
V
Total resistance
650Ω

R = R₁ + R₂ + … + Rₙ

Resistors counted3
Largest resistor330Ω
Loop current0.0138A
Loop current13.85mA
Total power dissipated0.1246W
Series total (ohms)650
Largest single resistor (ohms)330

3 resistors in series total 650 Ω.

  • In series the same current flows through every resistor, so the values add directly: R = R₁ + R₂ + … + Rₙ.
  • The total (650 Ω) is always larger than the biggest single resistor (330 Ω, about 51% of the chain).
  • With 9 V applied, the loop current is 0.0138 A (13.85 mA) and each resistor drops voltage in proportion to its share of the total.

Next stepNeed resistors side-by-side instead? Use the parallel resistor calculator, where the total is always smaller than the smallest member.

 = Powered by OnlyCalculators