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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

  • 0Black
  • 1Brown
  • 2Red
  • 3Orange
  • 4Geel
  • 5Green
  • 6Blue
  • 7Violet
  • 8Grey
  • 9White

Color 2st edge

Pick a color

  • 0Black
  • 1Brown
  • 2Red
  • 3Orange
  • 4Geel
  • 5Green
  • 6Blue
  • 7Violet
  • 8Grey
  • 9White

Multiplier

Pick a color

  • × 1 ΩBlack
  • × 10 ΩBrown
  • × 100 ΩRed
  • × 1 kΩOrange
  • × 10 kΩGeel
  • × 100 kΩGreen
  • × 1 MΩBlue
  • × 10 MΩViolet
  • × 100 MΩGrey
  • × 1 GΩWhite
  • × 0.1 ΩGold
  • × 0.01 ΩSilver

Tolerance

Pick a color

  • ± 1%Brown
  • ± 2%Red
  • ± 0.5%Green
  • ± 0.25%Blue
  • ± 0.1%Violet
  • ± 0.05%Grey
  • ± 5%Gold
  • ± 10%Silver
Resistor
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Resistor value:

Turn your phone to use the calculator

How do you calculate which resistance you need?

You can calculate the resistance (R) using Ohm's law (Ω). To calculate the resistance you need to know how much current (I) and voltage (U) you have. The formula that goes with this is:
U = I x R
However, the above formula is suitable for calculating the voltage. We want to know R. Therefore, the formula must be converted. The formula you need to calculate the resistance is:
R = U / I
(Resistance = Voltage / Current)
Ohm's formula
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