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Tools

Resistor Combination Finder
E-Series Resistor Finder
Voltage Divider Finder
Voltage Divider Builder
Circuit Calculator
Series/Parallel Calculator

Guides

Standard Resistor Values — E6 to E192 Reference Tables
Voltage Divider Formula, Derivation & Worked Examples
How to Calculate Parallel Resistance
Series vs Parallel Resistors — When to Use Which
E-Series Explained: Why 4.7 kΩ Exists and 5 kΩ Doesn't
Resistor Tolerance and How It Stacks in a Network
How to Get a Non-Standard Resistance from Standard Parts
Resistor Color Code — How to Read the Bands

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