Resistor ohm calculator

Resistor ohm calculator DEFAULT

1.2MΩ

The resistor color code was developed during the year 1920. The color bands are printed on the body of tiny resistor components. Generally, for color code, we can use this resistor mnemonic called BBROY Great Britain Very Good Wife. Whereas, the beginning letter indicates a unique color.

This color-coding shortcut has an acronym for how to identify a resistor value.

Color CodeResistor AcronymBand Color
0B
1B
2R
3O
4Y
5G
6B
7V
8G
9W

Resistors use the BS1852 (British standard) coding standard for value representation. It uses letter 'R' for ohms, 'K' for Kilo ohms, and 'M' for Megaohms. For example, a 4.7K ohm resistor is shown as 4K7.

Resistor Color Bands

The Carbon composition resistors have 3 to 6 resistor color bands. The 3-band resistor has three colors with multiplier and no tolerance.

The three bands can be selected to know the resistor value. Whereas, the 4 band, 5 band, and 6 band resistors have an extra band known as tolerance.

The color code chart shows the 3 bands, 4 band, 5 band, and 6 band resistor strips.

3 Band Resistor4 Band Resistor5 Band Resistor6 Band Resistor
1st bandFirst DigitFirst DigitFirst DigitFirst Digit
2nd bandSecond DigitSecond DigitSecond DigitSecond Digit
3rd bandMultiplier ValueMultiplier ValueThird DigitThird Digit
4th bandTolerance ValueMultiplier ValueMultiplier Value
5th bandTolerance ValueTolerance Value
6th bandTemperature Coefficient

To know, how to find color code, each color indicates a number starting from 0 to 9. This number can be used as the first significant digit and second significant digit for 3 band and 4 band. For 5 band and 6 band resistors, the first 3 digits indicate significant numbers.

The multiplier value is multiplied with the significant digit number (one, two, or three digits) to get the desired resistance value. In addition to this the 4 band, 5 band, and 6 band resistors have tolerance value ranging from ±0.10 to ±10.

The 6-band resistor has a special property of temperature coefficient of resistance represented in ppm/Kelvin. The higher ppm value indicates that a resistor can withstand the higher or lower temperature. The variation of resistance is constant to temperature.

Resistor Color Code Chart – 3 band 4 band 5 band and 6 band

To understand how to read the resistor color code for 3 /4/5/6 band resistors you can use this color chart.

Resistor Color Code Chart

From the above chart, each color band on the resistor represents a number. For example, to calculate 1.2MΩ, the resistor shows BrownRedGreen colors (read from left side to right). Now place the first two bands as the numeric value and third band as a multiplier (105).

Deviations in Resistor Color Coding

Reliability

To meet the military specification resistors often manufactured with reliability band. This band is not found in commercial electronics. Typically, a 4-band resistor comes with a reliability band.

Zero Ohm resistor

This resistor comes with a single black band used to connect the traces on a Printed Circuit Board (PCB). It is used as an interconnection between two joints.

Resistor bands with Gold and Silver

The gold and silver bands are prone to misconceptions of true colors in a resistor. Hence, they are replaced with grey and yellow color bands.

How to Use the Resistor Color Code Calculator

The resistor calculator tool calculates the color code for 3band, 4 band, 5 band, and 6 band resistors typically in the range of ohms, Kilo Ohms, and Mega Ohms.

The resistance calculator has 1 to 6 band colors with Multiplier (Mul) and tolerance (Tol) and PPM/Kelvin. You must select the right color corresponding to each column. The tolerance value tells the accuracy at which the resistor is manufactured. Normally, for gold, it is 5% and for silver, it is 10%.

This will display the true resistance value with tolerance and temperature coefficient of resistance.

Resistor Color Code Examples

To explore more, let’s discuss a few examples of resistor color code for 4, 5, and 6 band resistors.

4 band Color Code

For example, 4-band resistor has color BrownBlackOrangeGold. What's the resistor value?

10k ohm Resistor Color Code

By using the color chart, write the values as, 1/0/103 = 10 * 103 = 10K ohm/10K. The tolerance is ±5% for Gold. So, the value ranges from 9.5KΩ to 10.5KΩ.

5 Band Color Code

Another example (From chart): 5-band resistor has color Black – BrownBlackRedBrown.

5 Band 1K ohm Resistor Color Code

Write the values as, 0/1//0/102 = 10 * 100 = 1K ohm/1K. The tolerance is ±1% for Brown. Hence, the resistor value is 900Ω to 1.01KΩ

6 Band Color Code

A 6-band resistor has BlackBrownRedBrownBlueBrown

4 Band 120 Ohms Resistor Color Code

Using the chart, the values are 0/1/2/101 = 120 0hm/120R. The tolerance is ±0.25% for Blue and the temperature coefficient of resistance is 100ppm. So, the resistance becomes 119.7Ω -120.3Ω

Standard Resistor Values

Electronic color coding is standardized by the Electronic Industries Association (EIA) and later by the Radio Manufacturers Association (RMA) as standard color marking for resistors.

This marking code changes from one decade to another decade. This is known as the EIA color code. For each tolerance band, the EIA allocates E-series (E3, E6, E12, E24 and E96) to name the resistor values.

The standard decade resistors (also known as preferred values) are shown in the below table. The resistance calculation is starting from 1 ohm with tolerance range (36%, 10%, 5% and 1%).

E3 Series - Resistance with ±36% Tolerance (Value in Ohms)
1.02.24.7
E6 Series - Resistance with ±20% Tolerance (Value in Ohms)
1.01.52.23.34.76.8
E12 Series - Resistance with ±10% Tolerance (Value in Ohms)
1.01.21.51.82.22.73.33.94.75.6
E24 Series - Resistance with ±5% Tolerance (Value in Ohms)
1.01.11.21.31.51.61.82.02.22.4
2.72.93.03.33.64.34.75.15.66.2
6.87.28.29.1
E96 Series - Resistance with ±1% Tolerance (Value in Ohms)
11.021.051.071.101.131.151.181.211.24
1.271.301.331.371.401.431.471.501.541.58
1.621.651.691.741.781.821.871.911.962.00
2.052.102.152.212.262.322.372.432.492.55
2.612.672.742.802.872.943.013.093.163.24
3.323.403.483.573.653.743.833.924.024.12
4.224.324.424.534.644.754.874.995.115.23
5.365.495.625.765.906.046.196.346.496.65
6.816.987.157.327.507.687.878.068.258.45
8.668.879.099.319.539.76

To find the resistor values from E-series, take the preferred resistor with tolerance. We will get resistances by multiplying value with the multiplier constant. For example, E6 series resistor (1 ohm) with tolerance ±20, the set of resistances is 1, 20, 400, 8K, 160K.

Conclusion

Carbon strip resistors do not have their resistance value and tolerance printed on their body due to their size. Hence the resistor color code chart and calculator help to find out the resistor value without using a digital multimeter.

Here are some points to remember on resistor color coding.

  1. Resistor color code saying the Fifth band is black, which type of resistor?

    For a wire wound resistor, the 5th band is black and for a fusible resistor, the 5th band is white color. If the only single band (black color) in the middle it is a zero-ohm resistor.

  2. From which side should I read the resistor?

    Read from the left side to right. The idea is, the gold or silver bands (for tolerance) are present on the right side. If the gold, silver bands are not present, then the band that is close to the lead will be the first band.

  3. Which type of E-Series is mostly used?

    In most of the circuits, the preferred series are E6, E12, and E24. E96 series are high in cost as their tolerance is less.

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Resistor Calculator

The following are tools to calculate the ohm value and tolerance based on resistor color codes, the total resistance of a group of resistors in parallel or in series, and the resistance of a conductor based on size and conductivity.

Resistor color code calculator

Use this calculator to find out the ohm value and tolerance based on resistor color codes.

 

Parallel resistor calculator

Provide all of the resistance values in parallel, separated by a comma "," and click the "Calculate" button to determine total resistance.


Resistors in series calculator

Provide all of the resistance values in series separated by a comma "," and click the "Calculate" button to determine total resistance.


Resistance of a Conductor

Use the following to calculate the resistance of a conductor. This calculator assumes the conductor is round.


Resistor Color Code

An electronic color code is a code that is used to specify the ratings of certain electrical components, such as the resistance in Ohms of a resistor. Electronic color codes are also used to rate capacitors, inductors, diodes, and other electronic components, but are most typically used for resistors. Only resistors are addressed by this calculator.

How the color coding works:

The color coding for resistors is an international standard that is defined in IEC 60062. The resistor color code shown in the table below involves various colors that represent significant figures, multiplier, tolerance, reliability, and temperature coefficient. Which of these the color refers to is dependent on the position of the color band on the resistor. In a typical four-band resistor, there is a spacing between the third and the fourth band to indicate how the resistor should be read (from left to right, with the lone band after the spacing being the right-most band). In the explanation below, a four-band resistor (the one specifically shown below) will be used. Other possible resistor variations will be described after.

Significant figure component:

In a typical four-band resistor, the first and second bands represent significant figures. For this example, refer to the figure above with a green, red, blue, and gold band. Using the table provided below, the green band represents the number 5, and the red band is 2.

Multiplier:

The third, blue band, is the multiplier. Using the table, the multiplier is thus 1,000,000. This multiplier is multiplied by the significant figures determined from the previous bands, in this case 52, resulting in a value of 52,000,000 Ω, or 52 MΩ.

Tolerance:

The fourth band is not always present, but when it is, represents tolerance. This is a percentage by which the resistor value can vary. The gold band in this example indicates a tolerance of ±5%, which can be represented by the letter J. This means that the value 52 MΩ can vary by up to 5% in either direction, so the value of the resistor is 49.4 MΩ - 54.6 MΩ.

Reliability, temperature coefficient, and other variations:

Coded components have at least three bands: two significant figure bands and a multiplier, but there are other possible variations. For example, components that are made to military specifications are typically four-band resistors that may have a fifth band that indicates the reliability of the resistor in terms of failure rate percentage per 1000 hours of service. It is also possible to have a 5th band that is the temperature coefficient, which indicates the change in resistance of the component as a function of ambient temperature in terms of ppm/K.

More commonly, there are five-band resistors that are more precise due to a third significant figure band. This shifts the position of the multiplier and tolerance band into the 4th and 5th position as compared to a typical four-band resistor.

On the most precise of resistors, a 6th band may be present. The first three bands would be the significant figure bands, the 4th the multiplier, the 5th the tolerance, and the 6th could be either reliability or temperature coefficient. There are also other possible variations, but these are some of the more common configurations.

Color1st, 2nd, 3rd
Band Significant Figures
MultiplierToleranceTemperature Coefficient

 

Black
0× 1 250 ppm/K (U)

 

Brown
1× 10±1% (F)100 ppm/K (S)

 

Red
2× 100±2% (G)50 ppm/K (R)

 

Orange
3× 1K±0.05% (W)15 ppm/K (P)

 

Yellow
4× 10K±0.02% (P)25 ppm/K (Q)

 

Green
5× 100K±0.5% (D)20 ppm/K (Z)

 

Blue
6× 1M±0.25% (C)10 ppm/K (Z)

 

Violet
7× 10M±0.1% (B)5 ppm/K (M)

 

Grey
8× 100M±0.01% (L)1 ppm/K (K)

 

White
9× 1G 

 

Gold
 × 0.1±5% (J)

 

Silver
 × 0.01±10% (K)

 

None
  ±20% (M) 

Resistors are circuit elements that impart electrical resistance. While circuits can be highly complicated, and there are many different ways in which resistors can be arranged in a circuit, resistors in complex circuits can typically be broken down and classified as being connected in series or in parallel.

Resistors in parallel:

The total resistance of resistors in parallel is equal to the reciprocal of the sum of the reciprocals of each individual resistor. Refer to the equation below for clarification:

Rtotal
1
  +  +  + ... +  

Resistors in series:

The total resistance of resistors in series is simply the sum of the resistances of each resistor. Refer to the equation below for clarification:

Rtotal = R1 + R2 + R3 ... + Rn


Resistance of a conductor:

Where:
    L is the length of the conductor
    A is the cross-sectional area of the conductor
    C is the conductivity of the material

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Resistor color code calculator

The calculator above will display the value, the tolerance and performs a simple check to verify if the calculated resistance matches one of the EIA standard values. Select the first 3 or 4 bands for 20%, 10% or 5% resistors and all 5 bands for precision (2% or less), 5-band resistors. Hover above the tolerance for min. and max. range values.

If you want to find out the color bands for a value, use the tool on the left. Enter the value, select the multiplier (Ω, K or M), the desired precision and hit 'Display resistor' or ENTER. You can also type in resistor values in shorthand notation like 1k5, 4M7 or 100R.

 

Standard EIA Decade Resistor Values:

E6 series: (20% tolerance)
10, 15, 22, 33, 47, 68

E12 series: (10% tolerance)
10, 12, 15, 18, 22, 27, 33, 39, 47, 56, 68, 82

E24 series: (5% tolerance)
10, 11, 12, 13, 15, 16, 18, 20, 22, 24, 27, 30, 33, 36, 39, 43, 47, 51, 56, 62, 68, 75, 82, 91

E48 series: (2% tolerance)
100, 105, 110, 115, 121, 127, 133, 140, 147, 154, 162, 169, 178, 187, 196, 205, 215, 226, 237, 249, 261, 274, 287, 301, 316, 332, 348, 365, 383, 402, 422, 442, 464, 487, 511, 536, 562, 590, 619, 649, 681, 715, 750, 787, 825, 866, 909, 953

E96 series: (1% tolerance)
100, 102, 105, 107, 110, 113, 115, 118, 121, 124, 127, 130, 133, 137, 140, 143, 147, 150, 154, 158, 162, 165, 169, 174, 178, 182, 187, 191, 196, 200, 205, 210, 215, 221, 226, 232, 237, 243, 249, 255, 261, 267, 274, 280, 287, 294, 301, 309, 316, 324, 332, 340, 348, 357, 365, 374, 383, 392, 402, 412, 422, 432, 442, 453, 464, 475, 487, 491, 511, 523, 536, 549, 562, 576, 590, 604, 619, 634, 649, 665, 681, 698, 715, 732, 750, 768, 787, 806, 825, 845, 866, 887, 909, 931, 959, 976

E192 series: (0.5, 0.25, 0.1 and 0.05% tolerance)
100, 101, 102, 104, 105, 106, 107, 109, 110, 111, 113, 114, 115, 117, 118, 120, 121, 123, 124, 126, 127, 129, 130, 132, 133, 135, 137, 138, 140, 142, 143, 145, 147, 149, 150, 152, 154, 156, 158, 160, 162, 164, 165, 167, 169, 172, 174, 176, 178, 180, 182, 184, 187, 189, 191, 193, 196, 198, 200, 203, 205, 208, 210, 213, 215, 218, 221, 223, 226, 229, 232, 234, 237, 240, 243, 246, 249, 252, 255, 258, 261, 264, 267, 271, 274, 277, 280, 284, 287, 291, 294, 298, 301, 305, 309, 312, 316, 320, 324, 328, 332, 336, 340, 344, 348, 352, 357, 361, 365, 370, 374, 379, 383, 388, 392, 397, 402, 407, 412, 417, 422, 427, 432, 437, 442, 448, 453, 459, 464, 470, 475, 481, 487, 493, 499, 505, 511, 517, 523, 530, 536, 542, 549, 556, 562, 569, 576, 583, 590, 597, 604, 612, 619, 626, 634, 642, 649, 657, 665, 673, 681, 690, 698, 706, 715, 723, 732, 741, 750, 759, 768, 777, 787, 796, 806, 816, 825, 835, 845, 856, 866, 876, 887, 898, 909, 920, 931, 942, 953, 965, 976, 988


FAQs

I have a 6-band resistor. How can I calculate its value?

Enter the first five colors. Resistors with 6 bands are basically 5-band resistors with an additional ring indicating the reliability or the temperature coefficient.

The resistor has only 3 bands

You don't have to enter the 4th band, as 20% resistors don't have a tolerance ring. They will be calculated using the 4 band rule (digit, digit, multiplier).

Examples:
Red, red, brown is a 220 ohm, 20% resistor
Brown, black, orange is a 10k, 20% resistor

Which band is the first?

The short answer: you'll know that from experience! But there are some rules you can follow:

1.) Some resistors have the color bands grouped together and/or close to one end. Hold the resistor with the closely grouped bands to your left and read the resistor from the left to the right.

2.) With 5% and 10% resistors the procedure is simple: hold the resistor with the silver or gold band to the right and read the resistor from the left to the right.

3.) The first band can't be silver or gold, so if you hold such a resistor you'll know instantly where to start. Also, the 3rd color for 4-band resistors will be blue (106) or less and the 4th color for 5 band resistors will be green (105) or less, as basic resistor values range from 0.1 Ohm to 10 Mohms.

What happens, if I start reading from the wrong end?

You should always attempt to work out the value, then check your result against a resistor value chart to see if it's listed there. If it isn't, then try reading it again starting from the other end and check again. This is a necessary step especially with five and six banded metal film resistors.

Our color code calculator runs this check automatically for you, and if the result is not a standard value, it will display a small tip. The warnings are there for your information only and do not always imply that the resistor is was read the wrong way -- see the notes below.


Notes

1.) The resistor color code and the EIA preferred values are internationally accepted standards, but some manufacturers have their own way of doing things. For example, many resistor manufacturers make every single value on the E24 list in 1% and 2% tolerance even though the practice makes little mathematical sense.

2.) Although the program was tested rigorously, it still may have a few bugs. Therefore, when in doubt (and when it's possible) don't hesitate to use your trusted, old friend -- the multimeter -- to double-check the critical components.


Examples

3 bands:

Yellow, violet, black --> 47 ohm 20%

Orange, orange, brown --> 330 ohm 20%

Brown, black, red --> 1k 20%

4 bands:

Green, blue, red, gold --> 5.6kohm 5%

Red, yellow, orange, gold --> 24kohm 5%

Blue, gray, yellow, silver --> 680k 10%

More 4 band resistor color code examples: E12 and E24 series.

5 bands:

Red, yellow, orange, black, brown --> 243 ohms, 1% precision 5-band resistor

Yellow, violet, gold, gold, yellow --> 4.7 ohms, 5% - this resistor is calculated with the 4-band rule (the yellow band is ignored).

Orange, black, black, brown, brown --> 3.00 k ohms, 1% - note: this is a non-standard 1% (E96) resistor, but some manufacturers make every value from the E24 series with 1% tolerance!

More: 5 band E48 (2%) series resistor color code examples.

6 bands:

Red, red, brown, brown, brown, red --> 2.21k, 1% 50ppm/°C

White, black, white, brown, red, red --> 9.09k, 2% 50ppm/°C

- do not enter the last band (red in the two examples above)

 

 

Hobby Electronics -> Resistor color code table -> Resistor color code calculator

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Resistor Color Code Calculator

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Calculator resistor ohm

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How to calculate Resistor Wattage - The importance of wattage in Resistors

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