Question about Casio fx-300ES Calculator

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My Casio fx-300ES won't power on.

I tried changing the batteries and that doesn't help. When I click "on" it does nothing. Any help?

Thanks in advance.


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  • 21 Answers

2 causes for this kind of problem:

1. lose battery contacts
2. poor connection on its components on the motherboard. (needs to resoldered)

Posted on May 27, 2008


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How to turn OFF Casio QL-10?

The photo you have given is fx-300 ES. In that you have to press SHIFT and than AC so that It will turn off.

May 31, 2013 | Casio fx-300ES Calculator

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How do you change Casio fx-300ES answers in decimal format, without changing Input/Output format, 3 / 4 [SHIFT] = x?, and switching with S<->D.

There are three ways to enforce the changes, and it is quite impressive for this calculator. Yet for you it is not enough. I am sorry but I am not aware of another way.

Maybe, just maybe, if you fixed the number of decimal digits to 0, all your results will be integers, and there won't be any reason to convert any result to a decimal and the problem will be solved.

Sep 11, 2011 | Casio fx-300ES Calculator

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My new casio fx-300ES calculator outputs answers as a fraction... how can i change the output to a decimal point?

To change a displayed result into a fraction, press the [S=D] key.
To force a result to be displayed as a decimal number before it is displayed, press [SHIF][=] instead of [=].

Aug 15, 2011 | Casio fx-300ES Calculator

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I dont know how to find the square root on my casio fx-300ES. please show me how thanks.

You have a key for it. It is marked with the symbol of a radical. Press the key and type in a positive number thaen press the = sign key.

Sep 24, 2010 | Casio fx-300ES Calculator

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You can download the user guide in PDF format by clicking this link.
  • You'll require Adobe PDF Reader installed on your computer to view the manual. If it is not already installed on your computer, download it free from:
Thanks for using FixYa.

Jun 20, 2010 | Casio fx-300ES Calculator

1 Answer

What battery to I buy for the backup battery in fx-300es?

Look on the back of the calculator. There should be a rectangle (rounded) where it says Casio and under it Rating. You should find there the battery type. For example, if it says LR44x1, you need one battery LR44 or equivalent. Different manufactures use different reference numbers.

Alternatively you may open the battery compartment, and read the reference number on the battery itself.

Hope it helps.


Nov 13, 2009 | Casio fx-300ES Calculator

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Casio fx-83ES

Press Shift and then In 

Dec 08, 2008 | Casio fx-300ES Calculator

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How do I get decimal answers

I had the same problem. To change the output to decimals, do the following:
Go to Math mode, then SHIFT, MODE (set-up), 2 (lineIO). This will cause answers to show in decimal format. I hope this helps.

I was able to find a manual at:

Nov 06, 2007 | Casio fx-300ES Calculator

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