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1  A little background of Octal Number System 
2  How to Use Octal Calculator 
Our octal calculator performs conventional mathematical operations like addition, subtraction, multiplication and division on octal numbers.
You’ve most likely heard of these operations being carried out on decimal system but they can also be performed on other systems, in this case: octal.
Not only that, but these operations on other systems also have various practical applications as well which you would read about later in the article.
Let’s first get the basics right!
A little background of Octal Number System
What is octal? It is a number system with a base 8 represented by digits from (0 to 7), unlike the decimal system that has a base of 10.
Octal numerals can be constructed from binary numbers by grouping subsequent binary numbers into classes of three (beginning from the right).
For instance, the binary characterization for decimal value 74 is 1001010. Two 0s can be put at the left side: (00)1 001 010, corresponding the octal digits 1 1 2, giving the octal signification for the decimal value of 45 as 112. ToDo calculation according to the binary number system check binary Calculator and for Hexadecimal check Hex Calculator.
How to Use Octal Calculator
In order to make calculations, just follow the steps given below:
 Enter the first octal digit.
 Enter the second octal digit.
 Select the type of operation you want to execute: whether addition or subtraction or multiplication or division.
 Press ‘calculate’
And that’s all, it’s as simple as that.

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Brilliant. An octal calculator that takes two octal numbers and gives the RESULT in OCTAL. A half (1/2) is 0.4. Tick. A quarter (1/4) is 0.2 Tick. And an eighth (1/10) is 0.1 I also got Pi (26/7 Octal) as 3.1111111 Probably the best Octal calculator on the plant.