Resistor Color Code Calculator · Practical guide
4 Band vs 5 Band Resistor: What's the Difference?
The extra band adds a third significant digit, which is how precision resistors express tighter, more exact values.
At a glance
The Core Difference
A 4-band resistor encodes two significant digits, a multiplier, and a tolerance. A 5-band resistor encodes three significant digits, a multiplier, and a tolerance. That third digit lets manufacturers mark precise values like 10.0 kΩ instead of rounding to the nearest standard value, which is why 5-band resistors are usually precision parts with ±1% or ±2% tolerance.
Interactive tool
Resistor Color Code Calculator
Enter your own values, then compare the result with the examples below.
Resistor Value
Side-by-Side Structure
| Position | 4-Band Resistor | 5-Band Resistor |
|---|---|---|
| Band 1 | 1st digit | 1st digit |
| Band 2 | 2nd digit | 2nd digit |
| Band 3 | Multiplier | 3rd digit |
| Band 4 | Tolerance | Multiplier |
| Band 5 | — | Tolerance |
The Same Value in Both Formats
A 10 kΩ resistor makes the difference obvious. In 4-band form it is brown-black-orange plus tolerance: 1-0 × 1,000 = 10,000 Ω. In 5-band form it is brown-black-black-red plus tolerance: 1-0-0 × 100 = 10,000 Ω. Both decode to 10 kΩ; the 5-band version simply had room to say 10.0 kΩ exactly.
When Does the Extra Digit Matter?
For pull-ups, LED resistors, and most hobby circuits, a 4-band ±5% part is fine. Precision matters in voltage dividers, sensor interfaces, and analog measurement circuits, where a 1% error can throw off a reading. Typical 5-band tolerances are brown (±1%) and red (±2%), while 4-band parts usually end in gold (±5%) or silver (±10%). Switch between the 4-band and 5-band tabs above to decode whichever type is in your hand.
Frequently Asked Questions
Can I substitute a 4-band resistor for a 5-band one?
Only if the tolerance allows it. A 5-band part marked ±1% may be critical to the circuit, and the nearest ±5% 4-band value could be out of spec. Match both the value and the tolerance.
Why do 5-band resistors use three digits?
Precision values do not always fit two digits. A 4.99 kΩ resistor needs three significant digits (4-9-9) plus a ×10 multiplier, which only the 5-band format provides.
What about 6-band resistors?
A sixth band indicates the temperature coefficient, how much resistance drifts per degree Celsius. The value and tolerance are read from the first five bands exactly as on a 5-band part.
How do I tell a 5-band resistor from a 4-band one?
Count the bands and look at the tolerance end. Five color rings with a brown or red band at one end almost always means a precision 5-band resistor.