Is this calculation free and private?

Yes, 100% of calculations execute locally in your web browser. No inputs or personal data are stored or transmitted.

What does the Parallel & Series Resistor Network Calculator give me?

It works out Total Series Resistance, Total Parallel Resistance, Series Circuit Current and Parallel Circuit Total Current, updating live as you change the inputs.

What do I need to enter?

Just Resistor R1, Resistor R2, Resistor R3 and Applied Supply Voltage. Every field has a sensible default you can start from.

Is my data uploaded anywhere?

No. The calculation runs in your browser with JavaScript — nothing you type is sent to a server or stored.

Does it work on a phone?

Yes. The layout adapts to small screens and needs no app or signup.

Parallel & Series Resistor Network Calculator

Calculate equivalent total resistance, branch currents, and total circuit dissipation for parallel and series resistor combinations.

100% free
Private in browser
No signup
No watermarks

Resistor R1 (Ohms Ω)

Resistor R2 (Ohms Ω)

Resistor R3 (Ohms Ω, 0 if unused)

Applied Supply Voltage (Volts)

Total Series Resistance (Ohms Ω)

790

Total Parallel Resistance (Ohms Ω)

Series Circuit Current (mA)

15.2

Parallel Circuit Total Current (mA)

200

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About Parallel & Series Resistor Network Calculator

Calculate equivalent total resistance, branch currents, and total circuit dissipation for parallel and series resistor combinations. Enter Resistor R1, Resistor R2 and Resistor R3 and the tool works out Total Series Resistance, Total Parallel Resistance and Series Circuit Current straight away. Everything runs in your browser, so your data never leaves your device.

How to use Parallel & Series Resistor Network Calculator

Enter Resistor R1, Resistor R2 and Resistor R3.
Adjust the remaining options (Applied Supply Voltage) to match your case.
Read Total Series Resistance, Total Parallel Resistance and Series Circuit Current in the results panel — copy or download what you need.

Key features

Shows Total Series Resistance (Ohms Ω)
Shows Total Parallel Resistance (Ohms Ω)
Shows Series Circuit Current (mA)
4 adjustable inputs, results update as you type
No signup, no limits

Frequently asked questions

Is this calculation free and private?: Yes, 100% of calculations execute locally in your web browser. No inputs or personal data are stored or transmitted.
What does the Parallel & Series Resistor Network Calculator give me?: It works out Total Series Resistance, Total Parallel Resistance, Series Circuit Current and Parallel Circuit Total Current, updating live as you change the inputs.
What do I need to enter?: Just Resistor R1, Resistor R2, Resistor R3 and Applied Supply Voltage. Every field has a sensible default you can start from.
Is my data uploaded anywhere?: No. The calculation runs in your browser with JavaScript — nothing you type is sent to a server or stored.
Does it work on a phone?: Yes. The layout adapts to small screens and needs no app or signup.

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