6-Band Resistor Colour Code Calculator
- 4 Band Resistor
- 5 Band Resistor
- 6 Band Resistor
This 6-band resistor colour code calculator allows you to calculate the resistance value of fixed value 6-band resistors using the coloured bands on their body. The 6-band resistors are high precision resistors which have an additional (6th) coloured band to specify their temperature coefficient in parts per million per 1oC change in temperature (ppm/oC).
Clearly, 6-band resistors are much more precise compared to the previous 4-band and 5-band resistors because of their temperature coefficient (TempCo) rating. Therefore, 6-band resistors are the most expensive type of fixed value axial resistor since they are manufactured to high tolerances.
6-BAND
INPUTS
| 1st Digit | 2nd Digit | 3rd Digit | Multiplier | Tolerance | Tempco | |
|---|---|---|---|---|---|---|
| Black | 0 | 0 | x1 | |||
| Brown | 1 | 1 | 1 | x10 | ± 1% | 100 |
| Red | 2 | 2 | 2 | x100 | ± 2% | 50 |
| Orange | 3 | 3 | 3 | x1K | 15 | |
| Yellow | 4 | 4 | 4 | x10K | ± 4% | 25 |
| Green | 5 | 5 | 5 | x100K | ± 0.5% | |
| Blue | 6 | 6 | 6 | x1M | ± 0.25% | 10 |
| Violet | 7 | 7 | 7 | x10M | ± 0.10% | 5 |
| Grey | 8 | 8 | 8 | x100M | ± 0.05% | |
| White | 9 | 9 | 9 | x1G | ||
| Gold | ÷ 10 | ± 5% | ||||
| Silver | ÷ 100 | ± 10% |
OUTPUT
Resistance: 56.00k ohms
Tolerance: ± 5%
Tempco: 25 ppm/°C
How to Use the 6-band Resistor Colour Code Calculator
To use this online 6-band resistor calculator tool is the same as before. Just click on a particular colour and number and watch how the individual coloured bands on the resistor illustration above change. For each coloured band, select the matching colour in the table column indicating the band number and its resistance value.
The resistor calculator tool calculates the colour code of a 6-band resistors resistance value in the range of Ohm’s, Kilo-ohms (kΩ), and Mega-ohms (MΩ), and is displayed on the resistor image above, together with the tolerance and the temperature coefficient values.
How To Read a 6-band Resistor Colour Code
As before, the first three coloured bands indicate the the nominal Ohmic value. The fourth coloured band is the decimal multiplication factor, and the fifth coloured band indicates the tolerance of the 6-band resistor. The sixth and final coloured band represents its temperature coefficient (TC) allowing them to be used in high precision temperature critical applications.
The colour code markings of a 6-band resistor are read one band at a time starting from the left to the right, with the larger width tolerance band oriented to the right side indicating its tolerance value. A gap between the tolerance and temperature coefficient bands, help distinguish between the resistors left and right sides.
By matching the colour of the first band with its associated number in the digit column of the colour chart below the first digit is identified and this represents the first digit of the resistance value.
6-band Resistor Markings
6 Band Resistors Colour Code Table
| Colour | 1st Band | 2nd Band | 3rd Band | Multiplier | Tolerance | Temp. Coeff. |
|---|---|---|---|---|---|---|
| Black | 0 | 0 | 0 | 1Ω | 250 ppm/oC | |
| Brown | 1 | 1 | 1 | 10Ω | ± 1% | 100 ppm/oC |
| Red | 2 | 2 | 2 | 100Ω | ± 2% | 50 ppm/oC |
| Orange | 3 | 3 | 3 | 1KΩ | 15 ppm/oC | |
| Yellow | 4 | 4 | 4 | 10KΩ | 25 ppm/oC | |
| Green | 5 | 5 | 5 | 100KΩ | ± 0.5% | |
| Blue | 6 | 6 | 6 | 1MΩ | ± 0.25% | |
| Violet | 7 | 7 | 7 | 10MΩ | ± 0.1% | 5 ppm/oC |
| Grey | 8 | 8 | 8 | 100MΩ | ||
| White | 9 | 9 | 9 | 1GΩ | ||
| Gold | 0.1Ω | ± 5% | ||||
| Silver | 0.01Ω | ± 10% |
Fixed Resistor Tolerance Value
A Resistors Tolerance value determines the maximum percentage change in resistance between its actual measured resistive value and its nominal fixed value. 6-band resistors tend to have the same low value tolerance values since they are also high quality precision metal-film axial resistors with tolerance values of 2% or less compared to wirewound or carbon composition resistors. Commonly, the tolerance of a 6-band resistor is expressed as some percentage of its preferred value.
Resistor Temperature Coefficient
The 6th coloured band of a 6-band precision resistor represents its Temperature Coefficient, (TC). Temperature coefficient indicates how much the actual resistance value of the resistor will change when the temperature around it changes. Normally, a resistors temperature coefficient is positive, meaning its resistances increases with temperature.
Temperature coefficient is typically expressed in parts per million (ppm) per degrees Celsius (oC), with reference to normal room temperature, typically +25oC with the coloured bands represent the following values:
- Brown = 100 ppm/oC
- Red = 50 ppm/oC
- Orange = 15 ppm/oC
- Yellow = 25 ppm/oC
- Blue = 10 ppm/oC
- Violet = 5 ppm/oC
For example, if a 6-band resistor has a nominal value of 1KΩ at 25oC and a temperature coefficient value of 100 ppm/ºC (0.0001 ohms per degree Centigrade temperature change), the resistor would have a resistive value change operating at 50oC of:
1000Ω(100ppm x 1000Ω x (50o – 25o)) = 1002.5Ω’s
That is the resistors value would change no more than 2.5Ω ohms variation over 25oC.
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