Resistor Color Code Chart

Use this resistor color code chart after the calculator result to document band order, nominal resistance, tolerance range, measured value, and circuit role.

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Quick reference table

Resistor color bands encode significant digits, a multiplier, and tolerance. The calculator result gives the nominal value, but the working decision should also compare the tolerance range, meter reading, and wattage or circuit function before a replacement part is chosen.

Color value quick reference

Color value quick reference
Color	Digit	Multiplier	Common tolerance
Black	0	x1
Brown	1	x10	1%
Red	2	x100	2%
Orange	3	x1,000
Yellow	4	x10,000
Green	5	x100,000	0.5%
Blue	6	x1,000,000	0.25%
Violet	7	x10,000,000	0.1%
Gray	8	x100,000,000	0.05%
White	9	x1,000,000,000
Gold		x0.1	5%
Silver		x0.01	10%

Band count and worksheet use

Band count and worksheet use
Bands	How to read	Result to document
4-band	2 digits, multiplier, tolerance	Nominal value and broad tolerance range
5-band	3 digits, multiplier, tolerance	Higher precision nominal value
6-band	3 digits, multiplier, tolerance, temperature coefficient	Precision part note and temperature behavior
Damaged or faded bands	Do not force a decode	Measure out of circuit when possible and check schematic

Formula basis

Resistance = significant digits x multiplier. Tolerance range = nominal resistance +/- tolerance percent.

Significant digits come from the first bands read from the correct end.
The multiplier scales the digits by a power of ten.
Tolerance gives the acceptable range around the nominal resistance.
The measured value confirms whether the actual component matches the decoded bands.

Worked examples

Decode brown black red goldBrown and black make 10, red multiplies by 100, and gold gives 5% tolerance. The result is 1,000 ohms with an acceptable nominal range of 950 to 1,050 ohms.

Decode blue gray black red brownFor a five-band part, blue gray black gives 680, red multiplies by 100, and brown gives 1% tolerance. The result is 68 kOhm with a range of about 67.32 kOhm to 68.68 kOhm.

Assumptions. Balanced load and line-to-line voltage assumptions behind this chart.

The chart covers common through-hole resistor color markings and common tolerance bands.
SMD parts, precision series, manufacturer-specific markings, and damaged components may need a datasheet or schematic check.
Decoded resistance does not confirm wattage, voltage rating, temperature behavior, or circuit suitability.

Code and standard notes. Planning limits that should be checked before final equipment selection.

This chart helps identify component value and does not validate resistor wattage, substitution, or equipment repair decisions by itself.

How to use this chart

1Find the tolerance endIdentify the tolerance band first when possible so the significant digit bands are read in the correct order.

2Decode and calculate rangeUse the calculator result for nominal resistance, then apply tolerance to get the acceptable value range.

3Compare with measurementMeasure the part when practical and record whether the meter reading fits the decoded tolerance range.

Worksheet checklist. Record source basis, review gaps, and assumptions before using the chart result.

Record band sequenceWrite the color sequence exactly as read, including whether the part is four-band, five-band, or six-band.
Document nominal and toleranceCalculate nominal resistance and the low-to-high tolerance range so the value is not treated as exact.
Add circuit roleNote whether the resistor is a pull-up, divider part, current limiter, shunt, or power resistor before choosing a substitute.

Common mistakes to avoid. Review these before turning chart current into an equipment decision.

Reading from the tolerance end and reversing the significant digits.
Replacing a resistor by ohms alone without checking wattage, tolerance, and circuit function.
Measuring a resistor in circuit and assuming the reading is the part value even when parallel paths are present.

Frequently asked questions

These answers explain how to use the chart without turning a quick reference into a final design decision.

How do I know which end to read first?

The tolerance band is often spaced farther from the others or uses gold, silver, or another tolerance color. Read from the opposite end when the layout is clear.

Should I still measure the resistor?

Yes. Meter measurement helps confirm the band reading and catches damaged, overheated, mislabeled, or in-circuit parts.

Does the color code show wattage?

No. Wattage usually comes from physical size, datasheet, or part specification, not from the color bands alone.