🍰 Fraction Calculator
Add, subtract, multiply or divide two fractions, simplified automatically.
About this tool
Performs the four basic operations on two fractions — addition, subtraction, multiplication, and division — and automatically reduces the result to its simplest form using the greatest common divisor.
Also shows the decimal equivalent alongside the simplified fraction, useful for double-checking or for contexts where a decimal is more practical.
Worked example
1/2 + 1/3 = 5/6 (about 0.8333). 3/4 ÷ 1/2 simplifies to 3/2, or 1.5.
How to use it
- Enter the first fraction's numerator and denominator.
- Choose an operation.
- Enter the second fraction's numerator and denominator.
- Press Calculate to see the simplified result and its decimal equivalent.
Tips
- Negative fractions work fine — enter a negative sign on the numerator or denominator.
- The result is always shown in lowest terms automatically, so you never need to simplify by hand afterward.
- Dividing by a fraction is the same as multiplying by its reciprocal — this tool handles that conversion internally.
FAQ
Does this simplify the answer automatically?
Yes — every result is reduced to lowest terms using the greatest common divisor before being displayed.
Can I use negative numbers?
Yes, enter a minus sign directly on the numerator or denominator you want to be negative.
What happens if I try to divide by zero?
The calculator blocks it and shows a message, since dividing by a fraction equal to zero is undefined.
From the blog: getting the most out of this tool
Fraction arithmetic is one of those skills that's easy to understand conceptually but genuinely fiddly to execute by hand without a mistake, especially finding a common denominator under time pressure — so this tool exists mainly to double-check your own work, not replace understanding it.
The automatic simplification step is the part people usually forget to do manually, which is why we made it the default rather than an optional extra click.