3 Professional Tools
Resistor Calculators — Color Code, Series & Parallel
Free resistor calculators: parallel & series total R, online color code decoder & beginner chart guide. LED resistor sizing — instant results.
Quick Answer
Series resistors add (R = R1 + R2). Parallel resistors use 1/R = 1/R1 + 1/R2. Color bands encode value per IEC 60062 — gold = ±5% tolerance.
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Parallel & Series Resistor Calculator
Total equivalent R — #1 priority for series & parallel networks
Resistor Color Code Calculator
Online decoder — tap band colors for instant ohms
How to Read Resistor Color Code
Free chart, mnemonic & step-by-step walkthrough
LED Resistor Calculator
Size current-limiting resistors after decoding values