If I convert a number into octal, how do I convert it back? The same for hexagonal. Thanks.

Here's an example of a conversion
There are many many different ways to this type of conversions...

Dim Hexz as string
Dim Number as long

Number = 12345
Hexz = Hex(Number) 'Hex() returns string
MsgBox Hexz
Number = Val("&H" & Hexz) 'Get the Long 'decimal value by putting "&H" before the hex 'value, and let the Val() function 'automatically convert it.
'MsgBox Number 'you will see that it is 12345

Actually you could also store the Hex value in a long type var, using CLng()

Here's a formula you can use to convert to Base-10:

For each digit, starting with the one farthest on the right, add the sum of the digit times the original base to the power of the position (the first position is 0, the next is 1, etc.)

For example:
Binary 10100100 would be:

0*2^0 + 0*2^1 + 1*2^2 + 0*2^3 + 0*2^4 + 1*2^5 + 0*2^6 + 1*2^7 = Base 10 equivilent = 164

It's not a very complicated formula to execute with a For/Next loop.

-Burbble