Fraction Calculator●
Keep the answer exact. Let the fractions fall into place.
Use a fraction, whole number, decimal or mixed number: 2/3, −4, 0.125 or −2 1/3.
Exact fractions · mixed numbers · decimal equivalents
Your result
3/4 + 2/3 =
- Mixed number
- 1 5/12
- Decimal
- ≈ 1.4166666666667
Exact value
17/12
See how it works.
Use a common denominator, add the numerators and reduce the result.
a/b + c/d = (ad + bc)/bd
- 9/12 + 8/12 = 17/12
Decimal displays use up to 14 significant digits. ≈ marks a rounded decimal; exact values remain available.
Your inputs stay in this tab. Calculations happen in your browser; they are not uploaded or saved.
A few things to try.
Choose an example to fill in the calculator.
One value. A few useful forms.
A fraction represents a numerator divided by a nonzero denominator. This calculator reduces the result, keeps the sign in the numerator and shows its mixed-number and decimal forms. Mixed numbers apply their sign to the entire value: −2 1/3 = −7/3.
Percentage Calculator →Common questions
Can I enter mixed numbers and negative fractions?
Yes. Enter 2 1/3 or −2 1/3, with a space between the whole number and the proper fraction. The sign applies to the entire mixed number. Negative denominators in simple fractions are also accepted and normalised.
How do I turn a decimal into a fraction?
Choose Simplify / convert and enter the decimal, for example 0.125. The exact fraction is 1/8. A typed decimal is interpreted exactly as written; 0.333 means 333/1000, not 1/3.
Why is a decimal marked with ≈?
Some fractions repeat forever in decimal, such as 1/3 = 0.3333… Others need more than the 14 significant digits shown. The fraction result remains exact; ≈ applies only to the displayed decimal.
Can I divide by zero?
No. Fractions cannot have a zero denominator, and a zero-valued fraction cannot be used as the divisor. Zero is valid as a numerator and for the other operations.
How large can the inputs be?
Each field accepts up to 128 characters. Calculations use exact fractions with a maximum of 4096 bits in a reduced numerator or denominator. Results and inputs are not uploaded or saved.