On a calculator it is the log button. If you want to compute a logarithm with an arbitrary base but can access only a natural logarithm calculator or a log 10 base calculator you need to apply the following rules. How to Use the Calculator.
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Type your algebra problem into the text box. Practice your math skills and learn step by step with our math solver. In order to calculate log -1 y on the calculator enter the base b 10 is the default value enter e for e constant enter the logarithm value y and press the or calculate button. The ln calculator allows to calculate online the natural logarithm of a number.