This free online conversion calculator will reduce fractions into simplest form and then convert the simplified fraction into a decimal number, and then into a percentage.
Plus, unlike other online conversion calculators, this calculator will show its work  including the steps it took to reduce the fractions, as well as the long division you would use for converting fractions into percentages manually.
If you are looking for a free online calculator for converting decimals into fractions, please visit the convert decimals to fractions calculator.
Also, be sure to check out my other online fraction calculators for addition & subtraction, multiplication, division, and comparison.
The steps for converting fractions to percentages vary depending on whether you are using a handheld calculator or you are doing the conversion manually.
If you are using a handheld calculator, you simply divide the top number of the fraction by the bottom number of the fraction to get the decimal equivalent, and then multiply that result by 100.
For example, if you wish to convert 9/12 into a percentage, you would plug 9 ÷ 12 into the calculator, which would give the quotient 0.75. If you then multiply 0.75 by 100, the result would be equal to 75%.
On the other hand, if you are doing the conversion manually on a piece of paper or on a worksheet, you can save time by first reducing the fraction into simplest form.
Using the fraction used in the previous example, the first step would be to reduce 9/12 to simplest form, like this:
9  =  9 ÷ 3  =  3 
12  12 ÷ 3  4 
Once you have reduced the fraction, the next step is to convert the fraction to a decimal using long division, like this:
0  7  5  
4  3  0  0  0  0  0 
4 goes into 3 0 times >  0  
Add zero >  3  0  
4 goes into 30 7 times >  2  8  
30 minus 28 equal 2 & add zero >  2  0  
4 goes into 20 5 times evenly >  2  0  
Remainder is zero, so you are done >  0  0 
So after simplifying 9/12 to 3/4, and then using long division on the simplified fraction, we can see that the fraction 9/12 converts to 75%.
With that, let's use the Fraction to Percent Calculator for simplifying and converting fractions to percentages.

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