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Physics Calculators ▶ Resistance Calculator

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**Table of Content**

This ohm resistance calculator will readily calculate resistance and tolerance of an electrical circuit based on colour codes. Also computes conductorâ€™s resistance based on conductivity and size values entered. Moreover, you could estimate the combined series or parallel resistance with the tool.

**Something that forces the electric current not to flow is known as the resistance.**

Following are the standard voltage current resistance formulas to measure resistance:

Colour codes correspond to the ratings that define the potential of certain electrical components. But we have considered the codes for resistances only.

- Hold the resistance in your hand with tolerance bands to the most right
- Start noticing bands one by one from left to right and pick a value from the table (against colour) to estimate the desired ohm value.

For instance, the following pictures will let you understand pattern to calculate ohm value that you are holding:

Our electrical resistance calculator takes into account the table below to decode the colour code into value:

Color | 1st, 2nd, 3rd Band Significant Figures |
Multiplier | Tolerance | Temperature Coefficient |
---|---|---|---|---|

Black | 0 | Ã— 1 | 250 ppm/K (U) | |

Brown | 1 | Ã— 10 | Â±1% (F) | 100 ppm/K (S) |

Red | 2 | Ã— 100 | Â±2% (G) | 50 ppm/K (R) |

Orange | 3 | Ã— 1K | Â±0.05% (W) | 15 ppm/K (P) |

Yellow | 4 | Ã— 10K | Â±0.02% (P) | 25 ppm/K (Q) |

Green | 5 | Ã— 100K | Â±0.5% (D) | 20 ppm/K (Z) |

Blue | 6 | Ã— 1M | Â±0.25% (C) | 10 ppm/K (Z) |

Violet | 7 | Ã— 10M | Â±0.1% (B) | 5 ppm/K (M) |

Grey | 8 | Ã— 100M | Â±0.01% (L) | 1 ppm/K (K) |

White | 9 | Ã— 1G | ||

Gold | Ã— 0.1 | Â±5% (J) | ||

Silver | Ã— 0.01 | Â±10% (K) | ||

None | Â±20% (M) |

\(R_{total} = R_{1}+R_{2}+R_{3}+R_{4}+R_{5}+…+R_{n}\)

\(R_{total} = \dfrac{1}{\dfrac{1}{R_{1}}+\dfrac{1}{R_{2}}+\dfrac{1}{R_{3}}+\dfrac{1}{R_{4}}+\dfrac{1}{R_{5}}+…+\dfrac{1}{R_{n}}}\)

\(R = \dfrac{L}{A*C}\)

where;

**L** = Length of Conductor

**A** = Cross Sectional Area of the Conductor

**C** = Materialâ€™s Conductivity

Calculating resistance with our calculator is quite easy and swift. Letâ€™s learn its usage!

**Input:**

- Please select the resistance method from the top list there on tool
- Once you are done with your choice, go by entering the values or selecting colour combinations for your resistances
- Hit the calculate button

**Output:**

- Resistance calculations for conductors and circuits

From the source of Wikipedia: Electrical resistance and conductance, Ohm’s law, Static and differential resistance, AC circuits, Energy dissipation and Joule heating

From the source of Khan Academy: Current, do electrons in alternating current circuits

From the source of Coursehero: Resistors, Temperature and Superconductivity, Resistivity