# Resistance Ratio Calculator

This calculator requires the use of Javascript enabled and capable browsers. This calculator is designed to to display a ratio of standard 2% and 5% resistor values to resistance multipliers. These values, all below 100 ohms, have values in the 2% and/or 5% range and are factors in finding the higher resistance ratio values. These are industry standard values for the electronics industry worldwide. Enter the desired resistance ratio in the first field of the calculator below. Click on Calculate. This is usable with standard multipliers for resistance but can be used for non-standard values as well. For repeating decimals (for example, 2.3333333), be sure to fill out as many digits as possible for the greatest accuracy. See our Resistor Color Code Calculator.

Desired Resistance Ratio: 1 : Required Data Entry

Band Color
Options
Band #1
Possible
Band #2
Possible
Band #3
Possible
Multiplier Value
For Band 3
Band #4
Value Tolerance
Black   0 1 1
Brown 1 1 1 10
Red 2 2 2 100
Orange 3 3 3 1,000
Yellow 4 4 4 10,000
Green 5 5 5 100,000
Blue 6 6 6 1,000,000
Violet 7 7   10,000,000
Gray 8 8   100,000,000
White 9 9   1,000,000,000
None 20%
Silver 10%
Gold 5%
Version 2.4.2

The resistor color code is a long standing standard in both the electronics and electrical industries, indicating the value of resistance of a resistor. Resistance is measured in ohms and there is a foundation for it called Ohm's Law. (Want to know about Ohm's Law? If so, please click here or click here!) Each color band represents a number and the order of the color band will represent a number value. The first 2 color bands indicate a number. The 3rd color band indicates the multiplier or in other words the number of zeros. The fourth band indicates the tolerance of the resistor +/- 20%, 10% or 5%. In most cases, there are 4 color bands. However, certain precision resistors have 5 bands or have the values written on them, refining the tolerance value even more. There is no standard (TANS) however, for the 5th band. From one manufacturing company to another, the 5th band may indicate 2%, 1%, 1/2% or even closer, according to their own standards. Color bands are usually found on resistors that have a wattage value of 1/8 to 2 watts; though it is rare, there are some 5 watt resistors that are banded. There are also some capacitors that are color coded. See our Capacitor Color Code Calculator.

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