# How to convert from hex to dec ?

1. Jul 29, 2006

### tinhnho

Last edited: Jul 29, 2006
2. Jul 29, 2006

### chroot

Staff Emeritus
First, note that hexadecimal has 16 symbols (0-9, followed by 'A,' equal to decimal 10, through 'F,' equal to decimal 15).

The first digit on the right is the one's place. Take whatever number is in that position, and multiply it by one.

The next digit, second from the right, is the sixteen's place. Take whatever numer is that position, and multiply it by 16.

The next digit, thrid from the right, is the 256's place. (256 = 16^2.) Take whatever number is in that position, and multiply it by 16.

The next digit, fourth from the right, is the 4096's place (4096 = 16^3.) Take whatever number is in that position, and multiply it by 4096.

Add the result of all those multiplications, and you have the number in decimal.

- Warren

3. Jul 29, 2006

### tinhnho

here what i have for Hex 30500000 => Dec = 1052672

(16^3 + 16^5= 1052672)

my result seem doesn't right !

I confuse, would you give a example by number instead by words? Don't need to be exacted those hex number above, any number would fine with me, i will follow from there and try to undestand. Again thanks for your explaination.

4. Jul 29, 2006

### tinhnho

nevermind, i think i got it

here what i did 0x1 + 0x16 +0x(16^2) + 0x(16^3) +0x(16^4) +5x(16^5) +0x(16^6) +3x(16^7) =810549248

the result matchs with the calculator. thanks :)

Last edited: Jul 29, 2006
5. Jul 29, 2006

### jcsd

0 + 0*162 + 0*163 + 0*164 + 0*165 + 5*166 + 0*167 + 3*168 = 12968787968

6. Jul 29, 2006

### jcsd

Oops I lost a digit disregard my last post.

7. Jan 7, 2010

### davitz38

Hi guys,
In case you want to double check your results, use this http://www.stringfunction.com/hex-decimal.html" [Broken]
Hope this can help
David

Last edited by a moderator: May 4, 2017