What is the Fraction Calculator?
A fraction calculator does arithmetic with fractions and gives the answer in lowest terms. To add or subtract, use a common denominator: a/b + c/d = (ad + bc) ÷ bd; to multiply, multiply tops and bottoms (a/b × c/d = ac/bd); to divide, multiply by the reciprocal (a/b ÷ c/d = ad/bc). The result is then simplified by dividing by the greatest common divisor.
Enter proper fractions (3/4), improper fractions (9/4), mixed numbers (1 1/2), negatives (-2/3) or decimals (0.25). For example, 1 1/2 + 3/4 = 9/4, shown as the mixed number 2 1/4, the decimal 2.25 and 225%.
How to use the Fraction Calculator
- Type the First fraction — e.g. 3/4, 1 1/2 (a space between the whole number and the fraction) or 0.25.
- Choose the Operation: Add (+), Subtract (−), Multiply (×) or Divide (÷).
- Type the Second fraction.
- Read the simplified answer, mixed number, decimal and percent, which update as you type; use Copy results or Share result to save it.
Why use AnyShift's Fraction Calculator
Instant resultsNumbers update as you type — no submit button, no page reloads.
Formula shownEvery result shows how it was calculated so you can check the maths.
Editable assumptionsRates, fees and defaults are pre-filled but always adjustable.
Private by designCalculations run in your browser. Nothing is stored or sent.
Popular use cases
- Checking math homework with fractions and mixed numbers
- Scaling recipes, e.g. 3/4 cup × 1 1/2
- Adding up measurements in inches for woodworking and DIY
- Converting fractions to decimals and percentages
- Helping children practice simplifying fractions
Fraction, decimal and percent equivalents
| Fraction | Decimal | Percent |
|---|---|---|
| 1/2 | 0.5 | 50% |
| 1/3 | 0.333… | 33.33% |
| 2/3 | 0.667 | 66.67% |
| 1/4 | 0.25 | 25% |
| 3/4 | 0.75 | 75% |
| 1/5 | 0.2 | 20% |
| 1/8 | 0.125 | 12.5% |
| 3/8 | 0.375 | 37.5% |
| 5/8 | 0.625 | 62.5% |
| 7/8 | 0.875 | 87.5% |
| 1/16 | 0.0625 | 6.25% |
Working with percentages instead? Use the Percentage Calculator.
Frequently asked questions
How do you add fractions with different denominators?
Rewrite both over a common denominator, add the numerators, then simplify: 1/3 + 1/4 = 4/12 + 3/12 = 7/12. The calculator multiplies the denominators and reduces the result automatically.
How do I enter a mixed number?
Type the whole number, a space, then the fraction: 2 3/8. For a negative mixed number, put a minus sign in front: -2 3/8.
How do you divide fractions?
Keep the first fraction, flip the second and multiply: 3/4 ÷ 1/2 = 3/4 × 2/1 = 6/4 = 3/2, or 1 1/2 as a mixed number.
How do I simplify a fraction?
Divide the top and bottom by their greatest common divisor. For 18/24 the GCD is 6, so it simplifies to 3/4. Enter 18/24, choose Multiply and enter 1 to see the simplified form.
Can I convert a decimal to a fraction?
Yes. Enter the decimal (e.g. 0.375), choose Multiply and enter 1 as the second value to get 3/8. Repeating decimals such as 0.333 are treated as exact (333/1000), not as 1/3.
People also search for
fractions calculatoradding fractions calculatormixed number calculatorsimplify fractionsfraction to decimaldividing fractions calculatormultiplying fractionssubtracting fractions calculatorimproper fraction calculatorlowest terms calculator
Last reviewed: Built for: United States, United Kingdom, Canada, Australia, France Part of Text & Education