1. What is a Resistor Code Calculator?

Definition: This calculator decodes the color bands on resistors to determine their resistance value and tolerance.

Purpose: It helps electronics engineers, technicians, and hobbyists quickly identify resistor values without memorizing the color code.

2. How Does the Calculator Work?

The calculator uses the standard resistor color code:

Where:

• Band1 — First significant digit (1st color band)
• Band2 — Second significant digit (2nd color band)
• Multiplier — Power of ten multiplier (3rd color band)
• Tolerance — Percentage variation (4th color band)

3. Importance of Resistor Codes

Details: Proper resistor identification is crucial for circuit design, troubleshooting, and ensuring electronic devices function correctly.

4. Using the Calculator

Tips: Select the colors of each band from the dropdown menus. The calculator will display the resistance value and tolerance range.

5. Frequently Asked Questions (FAQ)

Q1: What if my resistor has 5 or 6 bands?
A: This calculator handles 4-band resistors. For 5/6-band resistors, additional bands represent more significant digits or temperature coefficients.

Q2: Why are some multiplier values not whole numbers?
A: Gold and silver multipliers represent division (0.1 and 0.01) for very small resistance values.

Q3: How accurate are resistor color codes?
A: Accuracy depends on the tolerance band. A gold band (±5%) is common for general purpose resistors.

Q4: Can I use this for surface mount resistors?
A: No, SMD resistors use numerical codes. This calculator is for through-hole resistors with color bands.

Q5: Where can I download a printable color code chart?
A: Click the download button below to get a PDF reference chart.