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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 conductor’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 | × 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) |

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

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

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

where;

**L** = Length of Conductor

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

**C** = Material’s Conductivity

Calculating resistance with our calculator is quite easy and swift. Let’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