Calculate ohm law resistance.
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Series Resistance Calculator – Resistors in Series
Quick answer
If resistors are 100, 220, 330, the equivalent resistance is 650 Ω.
Resistors in series: R_total = R₁ + R₂ + R₃ + ….
Enter your values
- 100
- 220
- 330
3 values
Equivalent resistance
650Ω
How strongly the circuit opposes the flow of current, in ohms.
You enter Resistors 100, 220, 330. You get Equivalent resistance 650 Ω.
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About the Series Resistance Calculator – Resistors in Series
When resistors are connected end to end in series, the same current flows through all of them and their resistances simply add up. Enter each resistor's value in ohms to find the total.
Resistors of 100 Ω, 220 Ω and 330 Ω in series give 650 Ω.
Resistors in series
R_total = R₁ + R₂ + R₃ + …
Things to keep in mind
- The total is always larger than the largest single resistor.
- Voltage divides across the resistors in proportion to their resistance.
- For resistors side by side, use the Parallel Resistance calculator.
ELECTRICAL & ENGINEERING GUIDE
A quick guide to Series Resistance
Use it to get an accurate equivalent resistance in seconds — free, with no sign-up.
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How to Use the Series Resistance Calculator
1
Enter Resistors
Provide your resistors, in Ω.
2
View Your Results
Get your equivalent resistance instantly, calculated on our server.
What is Series Resistance?
This electrical & engineering tool works out your equivalent resistance instantly, so you don't have to do the math by hand.
“One quick calculation, so you always know your equivalent resistance before you decide.”
What Affects Your Equivalent resistance
Your equivalent resistance depends on the values below.
Resistors
Changing your resistors changes your equivalent resistance.
Example Result
Here's what you can expect from a series resistance calculation:
- Equivalent resistance
- 650 Ω
Frequently Asked Questions
- How to calculate series resistance?
- Fill in resistors in the Series Resistance Calculator – Resistors in Series above and your equivalent resistance is calculated instantly. Change any value to see how the result responds.
- What does an example series resistance calculation look like?
- If resistors are 100, 220, 330, the equivalent resistance is 650 Ω.
- Is this calculator free to use?
- Yes — every calculator on this site is completely free, with no sign-up or account required.
- How accurate is this calculator?
- It uses the standard formula and calculates on our server for every request, so results are precise for the values you enter.
- Is my data saved anywhere?
- No. Nothing you enter is stored or sent anywhere unless you choose to share a link with your values included.
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