how to change base

Assuming you refer to the change of base formula for logarithms:

 

Most calculators only determine logs with a base of 10. Ex: log₁₀10000  = 4

 

To determine a log value with a different base, such as log₂8, you would use the change of base formula, which states that:

 

 

log_ax = log_bx / log_ba

 

b in this case could be 10 (or e) to let you find the value on a calculator.

 

So log₂8

 

= log₁₀8 / log₁₀2

 

= 3

 

*On the website calculator, you could write in log₂8 as log(8,2) and get the same answer:)