How to calculate resistor value using colour code ( for beginner )

You can find resistor value of some 5 watt and above has written on that resistor . Some resistor of 1/8 watt , 1/4 watt, 1/2 watt , 1 watt & 2 watt has marked with four, five or six different colour without written its value.

How to calculate the value of that resistor ?

Its very easy !!

>>> Resistor with  4 Colour band.

Some resistor has four different colour band, 1st band denotes its first Digit of value , 2nd band denotes its second digit of value, 3rd band denotes multiplying factor and 4th band denotes its tolerance.

Colour Code Table for 4 colour band 

Most important its 3rd Band colour .

Example 1 : Third Band colour Silver (x0.01 ohm).
1st Band (#) --- 2nd Band (#) --- 3rd Band ( Silver ) --- 4th Band (±T%)

= ## x0.01 ±T%
= 0.## ohm ±T%

Example 2 : Third Band colour Golden(x0.1 ohm).
1st Band (#) --- 2nd Band (#) --- 3rd Band ( Golden ) --- 4th Band (±T%)

= ## x0.1 ±T%
= #.# ohm ±T%

Example 3 : Third Band colour Black(x1 ohm).
1st Band (#) --- 2nd Band (#) --- 3rd Band ( Black ) --- 4th Band (±T%)

= ## x1 ±T%
= ## ohm ±T%

Example 4 : Third Band colour Brown(x10 ohm).
1st Band (#) --- 2nd Band (#) --- 3rd Band ( Brown) --- 4th Band (±T%)

= ## x10 ±T%
= ##0 ohm ±T%

Example 5 : Third Band colour Red(x100 ohm).
1st Band (#) --- 2nd Band (#) --- 3rd Band ( Red) --- 4th Band (±T%)

= ## x100 ±T%
= ##00 ohm  or #.#  Kilo ohm ±T%

Example 6 : Third Band colour Orange(x1000 ohm).
1st Band (#) --- 2nd Band (#) --- 3rd Band ( Orange) --- 4th Band (±T%)

= ## x1000 ±T%
= ##000 ohm or ## Kilo ohm ±T%

Example 7 : Third Band colour Yellow(x10000 ohm).
1st Band (#) --- 2nd Band (#) --- 3rd Band ( Yellow) --- 4th Band (±T%)

= ## x10000 ±T%
= ##0000 ohm or ##0 Kilo ohm ±T%

Example 8 : Third Band colour Green(x100000 ohm).
1st Band (#) --- 2nd Band (#) --- 3rd Band ( Green) --- 4th Band (±T%)

= ## x100000 ±T%
= ##00000 ohm or ##00 Kilo ohm  or #.# Mega ohm ±T%

Example 9 : Third Band colour Blue (x1000000 ohm).
1st Band (#) --- 2nd Band (#) --- 3rd Band ( Blue ) --- 4th Band (±T%)

= ## x1000000 ±T%
= ##000000 ohm or ##000 Kilo ohm  or ## Mega ohm ±T%

Example 10 : Third Band colour Violet (x10000000 ohm).
1st Band (#) --- 2nd Band (#) --- 3rd Band ( Violet ) --- 4th Band (±T%)

= ## x10000000 ±T%
= ##0000000 ohm or ##0000 Kilo ohm  or ##0 Mega ohm ±T%

Example 11 : Third Band Colour Grey (x100000000 ohm).
1st Band (#) --- 2nd Band (#) --- 3rd Band ( Grey ) --- 4th Band (±T%)

= ## x100000000 ±T%
= ##00000000 ohm or ##00000 Kilo ohm  or ##00 Mega ohm or #.# Giga ohm ±T%

Example 12 : Third Band Colour White (x1000000000 ohm).
1st Band (#) --- 2nd Band (#) --- 3rd Band ( White ) --- 4th Band (±T%)

= ## x1000000000 ±T%
= ##000000000 ohm or ##000000 Kilo ohm  or ##000 Mega ohm or ## Giga ohm ±T%

>>> Resistor with  5 Colour band.

Some resistor has five different colour band, 1st band denotes its first Digit of value , 2nd band denotes its second digit of value, 3rd band denotes its third digit of value, 4th band denotes multiplying factor and 5th band denotes its tolerance.

Colour Code Table for 5 colour band 

Most important its 4th Band colour.

Example :