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Fraction Calculator

Add, subtract, multiply, divide fractions

By Guga — BrowserTools maintainer, Tbilisi, Georgia Updated 2026-09-12
Free Private No uploads
What is Fraction Calculator?

Fraction arithmetic produces answers in the wrong form by default — 24/96 is correct but useless — so this tool reduces every result by the greatest common divisor of numerator and denominator before showing it. You get three views of the same answer: the improper fraction in lowest terms, the mixed number with the whole part pulled out when there is one, and a decimal to six places with trailing zeros trimmed. Inputs are whole numbers rather than decimals, so 0.75 goes in as 3/4. The four operations are handled separately, and division correctly flips the second fraction before multiplying, which is the step most people drop when doing it in their head. Denominators of zero and division by a zero fraction are both caught and reported rather than producing infinity.

Perform arithmetic on fractions and mixed numbers with instant simplification to lowest terms, plus decimal equivalents. A homework helper that shows the simplified result.

Private Fraction Calculator In Your Browser

Fraction Calculator is processed locally with client-side JavaScript. Your files never touch a server, and there is no queue to wait in.

Step-by-Step

How to use Fraction Calculator

1

Enter the first fraction in the numerator and denominator fields for it.

2

Choose the operation from the Operation dropdown: add, subtract, multiply or divide.

3

Enter the second fraction in its own numerator and denominator fields.

4

Read the result in lowest terms, then the mixed number and decimal forms underneath it.

Key Capabilities
  • Every answer is divided by the greatest common divisor, so results always arrive in lowest terms rather than as raw cross-multiplied products.
  • Three representations of the same value are shown — improper fraction, mixed number and decimal — so you can use whichever fits the context.
  • The decimal form is trimmed of trailing zeros so a value like 0.500000 reads as 0.5.
  • A negative denominator is normalised by moving the sign to the numerator, so results always read conventionally.
Common Use Cases
  • A student checks a homework answer that came out as 24/96 and needs to know whether it reduces.
  • A cook scales a recipe that lists quantities as fractions of a cup without converting everything by hand.
  • A woodworker reduces a cut list written as sixths down to the smallest useful measurement.
Clear Answers

Frequently Asked Questions

Why do I need to enter 0.75 as three quarters?
The fields take whole numbers only. Convert 0.75 to 3/4 at the top, or read the decimal form if you started from a decimal somewhere else.
How does dividing fractions actually work here?
The second fraction is inverted and then multiplied, so 3/4 ÷ 5/6 becomes 3/4 × 6/5 and reduces to 9/10.
Can I mix whole numbers with fractions?
Yes. Enter a whole number as the numerator with 1 as the denominator, for example 7/1.
What happens if a denominator is zero?
The tool reports that denominators cannot be zero. For division it separately refuses to divide by a zero fraction rather than returning an undefined result.