How to calculate resistor color code

How to calculate resistor color code

How to calculate resistor color code

The following are equipment to calculate the ohm price and tolerance primarily based totally on resistor color codes, the whole resistance of a collection of resistors in parallel or collection, and the resistance of a conductor primarily based totally on length and conductivity.

Resistor color code calculator

Use this calculator to discover the ohm price and tolerance primarily based totally on resistor color codes.

Number of Bands:

four Band

1st Band Color:

2d Band Color:

Multiplier Color:

Tolerance Color:

Parallel resistor calculator

Provide all the resistance values in resistor color code parallel, separated through a comma “,” and click on the “Calculate” button to decide on general resistance.


Resistors in collection calculator

Provide all the resistance values in the collection separated through a comma “,” and click on the “Calculate” button to decide on general resistance.


Resistance of a Conductor

Use the after calculating the resistance of a conductor. This calculator assumes the conductor is round.


a hundred







 S/m      Or Select Material



Resistor Color Code

A digital color code is a code this is used to specify the rankings of positive electric additives, which include the resistance in Ohms of a resistor. Electronic color codes also are used to fee capacitors, inductors, diodes, and different digital additives, however, are maximum generally used for resistors. Only resistors are addressed through this calculator.

How the color coding works:

The color coding for resistors is a global general this is described in IEC 60062. The resistor color code proven withinside the desk beneath includes numerous hues that constitute sizable figures, multiplier, tolerance, reliability, and temperature coefficient. Which of those the color refers to is depending on the location of the color band at the resistor.

In a normal four-band resistor, there’s a spacing among the 0.33 and the fourth band to suggest how the resistor must be read (from left to right, with the lone band after the spacing being the right-maximum band). In the rationale beneath, a four-band resistor (the only particularly proven beneath) might be used. Other feasible resistor versions might be defined after.

Significant discern issue:

In a normal four-band resistor, the primary and 2nd bands constitute sizable figures. For this situation, seek advice from the discern above with an inexperienced, crimson, blue, and gold band. Using the desk supplied beneath, the inexperienced band represents range five, and the crimson band is 2.


The 0.33, blue band, is the multiplier. Using the desk, the multiplier is for that reason 1,000,000. This multiplier is improved through the sizable figures decided from the preceding bands, in this example fifty-two, ensuing in a price of fifty-two,000,000 Ω, or fifty-two MΩ.


The fourth band isn’t always continually present, however, while it is, represents tolerance. This is a percent through which the resistor price can range. The gold band in this situation suggests a tolerance of ±five%, which may be represented through the letter J. This method that the price of fifty-two MΩ can range through as much as five% in both directions, so the price of the resistor is 49. four MΩ – 54.6 MΩ.

Reliability, temperature coefficient, and different versions:

Coded additives have as a minimum 3 bands:  sizable discern bands and a multiplier, however, there are different feasible versions. For example, additives that might be made to army specs are generally four-band resistors which can have a 5th band that suggests the reliability of the resistor in phrases of failure fee percent in keeping with one thousand hours of service.

It is likewise feasible to have a fifth band which is the temperature coefficient, which suggests the alternate in resistance of the issue as a characteristic of ambient temperature in phrases of ppm/K.

More commonly, there are five-band resistors which might be greater specific because of a 3rd sizable discern band. This shifts the location of the multiplier and tolerance band into the 4th and fifth functions in comparison to a normal four-band resistor.

On the maximum specific of resistors, a sixth band can be present. The first 3 bands will be the sizable discern bands, the 4th the multiplier, the fifth the tolerance, and the sixth may be both reliability or temperature coefficient. There also are different feasible versions, however, those are a number of the greater, not unusualplace configurations.

Color  1st, 2d, 3rd

Band Significant Figures         Multiplier          Tolerance        Temperature Coefficient

  Black 0          × 1                  250 ppm/K (U)

  Brown            1          × 10     ±1% (F)           a hundred ppm/K (S)

  Red   2          × a hundred     ±2% (G)          50 ppm/K (R)

  Orange          3          × 1K    ±0.05% (W)     15 ppm/K (P)

  Yellow           four      × 10K  ±0.02% (P)      25 ppm/K (Q)

  Green            five      × 100K            ±0.five% (D)    20 ppm/K (Z)

  Blue   6          × 1M    ±0.25% (C)      10 ppm/K (Z)

  Violet 7          × 10M  ±0.1% (B)        five ppm/K (M)

  Grey  8          × 100M            ±0.01% (L)      1 ppm/K (K)

  White 9          × 1G              

  Gold             × 0.1    ±five% (J)      

  Silver            × 0.01  ±10% (K)        

  None                        ±20% (M)       

Resistors are circuit factors that impart Printed circuit board in china electric resistance. While circuits may be exceedingly complicated, and there are numerous extraordinary methods wherein resistors may b organized in a circuit, resistors in complicated circuits can generally be damaged down and categorized as being related in the collection or parallel.

Resistors in parallel:

The general resistance of resistors in parallel is the same as the reciprocal of the sum of the reciprocals of every character resistor. Refer to the equation beneath for clarification:

Rtotal =          










 + … +



Resistors in collection:

The general resistance of resistors in the collection is the sum of the resistances of every resistor. Refer to the equation beneath for clarification:

Rtotal = R1 + R2 + R3 … + Rn

Resistance of a conductor:

R =     


A × C


    L is the duration of the conductor

    A is the cross-sectional vicinity of the conductor

    C is the conductivity of the material

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