Parallel and Series Resistor Calculator

Part of: Engineering →

✓ Calculate resistor values, circuit parameters, or engineering constants
✓ Uses standard engineering formulas with clearly stated assumptions
✓ Supports multiple unit systems — enter in your preferred scale
✓ Free, results shown with the formula used

Parallel Resistors Series Resistors

Parallel Resistors

R10

Add Resistor

Parallel Resistor formula

Result Format

Total Resistance:

Series Resistors

R10

Add Resistor

Series Resistor formula

Result Format

Total Resistance:

results

Through Hole Resistors

Chip Resistors - Surface Mount

Chassis Mount Resistors

Specialized Resistors

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PART NO.	MANUFACTURER	PRICE	STOCK	MIN QTY	DIGIKEY PART NO.	RESISTANCE	TOLERANCE	POWER (WATTS)	COMPOSITION

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How to Use the Parallel And Series Resistor Calculator

Select the circuit parameter or formula you want to solve.
Enter the known values with their units — the calculator accepts standard SI and common units.
Click Calculate to solve for the unknown value.
Note any assumptions and tolerance considerations shown in the result.

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Frequently Asked Questions

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Parallel and Series Resistor Calculator