The online Logarithm & antilogarithms calculator provides you logarithm and anti-logarithm, you can select the common base e 10 or 2, you can also input any integer as the base.
When you Click the logarithm button, it can calculate the logarithm of number. when you click the anti-log button, it can calculate the anti-logarithm, what you need do is input the number and select the base click "calculate" button get the result.
For example you input the base is 18, then the logarithm of 36 is 0.80657359638, input 10 base is e, result is 2.302585093, base is 10 result is 1, base is 2 result is 3.3219280949.
Input 10, the anti-logarithm base e result is 2.2026465795e+4, base 10 result is 1.0000000000e+10, base 2 result is 1.0240000000e+3.