How to calculate log base 2 using a scientific calculator?

Our scientific calculator actually has 2 buttons are for Logarithm calculation, [see the photo]

1. "log" button: is to calculate log base 10 (known as Common Logarithm)
2. "ln" button: is to calculate log base e (known as Natural Logarithm)

Now to calculate log base 2, you can use any of these two, just that you will need to convert it into base 2.

You can do this by dividing your result by the "log" or "ln" of base 2. 

Let me give an example for each case.

Example:
If you to calculate log(x) base 2, then calculate log(x) base 10 then divide it by log2.
Or,
to calculate ln(x) base 2, do it with base 10 then divide it by ln2.

Calculation example:
log8 base 2 is 3. using calculator is should be log8 base 10 / log2.


Thank you :)
by Hasin Arefin Khan