Resistor color code calculator
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Position the resistor with the tolerance band (gold/silver) on the right, then read from left to right.
E12, E24 series: 10, 12, 15, 18, 22, 27, 33, 39, 47, 56, 68, 82 are commonly used values.
A tool that automatically calculates resistance value, tolerance, and temperature coefficient by selecting the color codes of a resistor. Supports 4-band, 5-band, and 6-band resistors with visual representation of the actual resistor appearance.
Choose the Number of Bands
Choose the number of color bands on the resistor: 4, 5, or 6.
Choose the Colors
Choose the color of each band in the order shown on the resistor.
Review the Results
View the calculated resistance, tolerance, and allowable range.
View the Visualization
See a visual resistor with your selected band colors applied.
Place the tolerance band, usually gold or silver, on the right and read the bands from left to right.
A 4-band resistor has 2 significant digits and ±5–10% tolerance, while a 5-band resistor has 3 significant digits and ±1–2% tolerance. The 5-band type is more precise.
A 6-band resistor adds a temperature-coefficient band to the 5-band design. It is used in precision circuits that are sensitive to temperature changes.
In the multiplier position, gold means ×0.1 and silver means ×0.01. In the tolerance position, gold means ±5% and silver means ±10%.
They are standard resistor-value series. E12 provides the 12 base values 10, 12, 15, 18, 22, 27, 33, 39, 47, 56, 68, and 82, while E24 provides 24 more finely spaced base values.