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Parallel Resistance Calculator – Resistors in Parallel

Electrical & Engineering · Electrical

Quick answer

If resistors are 100, 220, 330, the equivalent resistance is 56.8966 Ω.

Resistors in parallel: 1 ÷ R_total = 1 ÷ R₁ + 1 ÷ R₂ + 1 ÷ R₃ + ….

Enter your values

  • 100
  • 220
  • 330
3 values

Equivalent resistance

56.8966Ω

How strongly the circuit opposes the flow of current, in ohms.

You enter Resistors 100, 220, 330. You get Equivalent resistance 56.8966 Ω.

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About the Parallel Resistance Calculator – Resistors in Parallel

When resistors are connected side by side, current splits between them and the combined resistance is lower than any single one. Enter each resistor's value in ohms to find the equivalent resistance.

Resistors of 100 Ω, 220 Ω and 330 Ω in parallel give about 56.9 Ω.

Resistors in parallel

1 ÷ R_total = 1 ÷ R₁ + 1 ÷ R₂ + 1 ÷ R₃ + …

Things to keep in mind

  • The total is always smaller than the smallest single resistor.
  • The same voltage appears across every resistor in parallel.
  • For two resistors, R_total = (R₁ × R₂) ÷ (R₁ + R₂).
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A quick guide to Parallel Resistance

Use it to get an accurate equivalent resistance in seconds — free, with no sign-up.

  • Instant results

    See your equivalent resistance the moment you enter your numbers.

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How to Use the Parallel 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 Parallel 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 parallel resistance calculation:

Equivalent resistance
56.8966 Ω

Frequently Asked Questions

How to calculate parallel resistance?
Fill in resistors in the Parallel Resistance Calculator – Resistors in Parallel above and your equivalent resistance is calculated instantly. Change any value to see how the result responds.
What does an example parallel resistance calculation look like?
If resistors are 100, 220, 330, the equivalent resistance is 56.8966 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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Parallel Resistance

Enter your values

  • 100
  • 220
  • 330
3 values

Equivalent resistance

56.8966Ω

How strongly the circuit opposes the flow of current, in ohms.

You enter Resistors 100, 220, 330. You get Equivalent resistance 56.8966 Ω.

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