Calculate resistance
With this resistance calculator you can easily calculate the value of your resistance. When you enter the colors of your resistor, the calculator will immediately calculate the value.
Number of rings
Color 1st edge
Pick a color
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0Black
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1Brown
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2Red
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3Orange
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4Yellow
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5Green
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6Blue
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7Purple
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8Grey
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9White
Color 2st edge
Pick a color
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0Black
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1Brown
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2Red
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3Orange
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4Yellow
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5Green
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6Blue
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7Purple
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8Grey
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9White
Multiplier
Pick a color
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× 1 ΩBlack
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× 10 ΩBrown
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× 100 ΩRed
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× 1 kΩOrange
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× 10 kΩYellow
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× 100 kΩGreen
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× 1 MΩBlue
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× 10 MΩPurple
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× 100 MΩGrey
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× 1 GΩWhite
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× 0.1 ΩGold
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× 0.01 ΩSilver
Tolerance
Pick a color
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± 1%Brown
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± 2%Red
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± 0.5%Green
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± 0.25%Blue
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± 0.1%Purple
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± 0.05%Grey
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± 5%Gold
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± 10%Silver
Resistor value:
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Read resistances
Most “through hole” resistors have 4, 5 or 6 rings. Each ring has its own color, thanks to these color codes you can easily read the value. With 4 rings, the first two rings are a number from 0 to 9. The third ring is the multiplier. Multiplies the first two rings. The 4th ring is the tolerance of the resistor.
Example: You have a resistor with the following colors. Red – Orange – Brown – Gold. Red is 2, Orange is 3, Brown is X10, Gold is 5%. In that case the resistance is 230 ohms with a tolerance of 5%.
With a resistor, the first 3 rings are numbers.
At 6 Rings, the first 3 rings are numbers and the last ring is PPM. PPM is the difference in temperature. PPM stands for “parts per million”. It is expressed in PPM / °C.
How do you calculate which resistance you need?
