Fraction Calculator
Fill in the values and the answer updates as you type.
How the Fraction Calculator works
Addition and subtraction use a common denominator: a/b + c/d = (ad + cb) ÷ bd. Multiplication is a/b × c/d = ac ÷ bd. Division multiplies by the reciprocal. The answer is reduced by the greatest common divisor. Use whole numbers. Example: with the default values, simplified fraction comes to 5 / 4.
Inputs and results
The Fraction Calculator takes 5 inputs and gives 3 results.
What you enter
- First numerator — starts at 1.
- First denominator — starts at 2.
- Operation — starts at +. Choose from: +, -, × and ÷.
- Second numerator — starts at 3.
- Second denominator — starts at 4.
What you get
- Simplified fraction
- Decimal
- Mixed number
Example: Fraction Calculator with the starting values
With first numerator 1, first denominator 2, operation +, second numerator 3 and second denominator 4, the calculator returns:
| Simplified fraction | 5 / 4 |
|---|---|
| Decimal | 1.25 |
| Mixed number | 1 1/4 |
Change any value above and the results update straight away.
Fraction Calculator FAQ
How do I use the Fraction Calculator?
Enter first numerator, first denominator, operation and second numerator in the fields, then read simplified fraction, decimal and mixed number in the result panel. The answer updates as you type, and you can press Calculate or Enter to refresh it. Use “Copy link” to share your exact numbers with someone else.
What does the Fraction Calculator calculate?
Add, subtract, multiply, or divide two fractions. It returns simplified fraction, decimal and mixed number from the 5 values you provide.
What values does the Fraction Calculator start with?
It opens with first numerator 1, first denominator 2, operation + and second numerator 3 so you can see a working result straight away. Replace them with your own numbers, or press Reset to return to these starting values.
Is the Fraction Calculator free and private?
Yes. It is free, needs no account, and runs in your browser, so nothing you type is sent to or stored on our servers. See the Privacy Policy for details.
Can I rely on the Fraction Calculator for important decisions?
Treat the result as a well-rounded estimate. Real situations often have details a general calculator cannot know, so confirm important decisions with a qualified professional. See the Disclaimer for more.