Change of Base Formula Calculator

The change of base formula calculator is here to help you out whenever you have a logarithm whose base you would like to change.

Clear
log base 25.6438561898
log base 101.6989700043
Conversion factor3.3219280949multiply the second by this to get the first
ln x3.9120230054
Working3.912023 ÷ 0.693147 = 5.643856

The rule

log_b(x) = log_c(x) ÷ log_c(b)