How to calculate the anti-log on a calculator

Logs and antilogs are mathematical functions that most students learn about in high school math classes. They are the inverse of each other, which means that they do opposite things; just like addition and subtraction, they cancel each other out. Almost any scientific calculator today can calculate both the log and the antilog of a given number. While it is possible to calculate logs and antilogs by hand, most people prefer to use a calculator because it is much faster and simpler.

Find the logarithms key on your calculator. This is the basis for finding the antilog. Almost all scientific calculators will have a button called "Log" for this function.

Examine your calculator to find out its notation for antilog. There are a few standard formats: most calculators will have "Alog," "Log-1" or "10^x" somewhere on the panel. A common place that you may see one of these notations is right above your "Log" key.

Enter the number that you want to find the antilog for using the numbers on your calculator keypad.

Press the "Alog," "Log-1" or "10^x" button on your calculator if you have one. This should give you the antilog of your number. If you do not have one of these keys, proceed to the next step.

Press the "Second" or "Shift" function on your calculator if you do not see one of the common antilog notations just above your "Log" key. This is a little like using a shift key on your computer to get a capital letter instead of a lower case one.

Press the "Log" key immediately after pressing the "Second" or "Shift" key. By pressing the "Second" key along with your "Log" key, you can calculate the antilog instead of the log.

Things You'll Need

  • Scientific calculator
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About the Author

Ethan Schwartz has been a scientific and freelance writer for a year, writing scientific literature for "Gene Therapy" and articles on education, health and personal finance for eHow. Schwartz graduated in 2009 with a Bachelor of Science in biological sciences and will begin medical school in July 2010.