Fraction Calculator
Math & EverydayAdd, subtract, multiply and divide fractions — exactly, not in decimals.
Runs entirely in your browser — nothing is uploaded
Features
- Exact integer arithmetic — no floating-point drift.
- Result simplified, plus mixed number, decimal and percentage.
- Decimal to fraction using continued fractions.
- Results update as you type, with no button to press.
How to use the Fraction Calculator
- 1Enter the two fractions and pick an operation.
- 2Read the simplified result in every form.
- 3Use the decimal box to go the other way.
Frequently asked questions
How do I add fractions with different denominators?
Put both over a common denominator, add the numerators, then simplify. 1/3 + 1/6 becomes 2/6 + 1/6 = 3/6 = 1/2. The tool shows the common denominator it used.
Why not just convert to decimals?
Because decimals lose precision. One third is 0.333… which never terminates, so adding it to a sixth in floating point gives 0.5000000000000001. Working in whole numbers and reducing at the end gives exactly one half.
How do I convert a decimal to a fraction?
The tool uses continued fractions, which finds the simplest fraction matching the decimal. That is why 0.3333 returns 1/3 rather than 3333/10000 — it recognises what the decimal is approximating.
What is a mixed number?
An improper fraction written as a whole part plus a proper fraction: 7/3 becomes 2 1/3. Both forms are shown, since different contexts want different ones.