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Everyday Calculators

Fraction calculator

Add, subtract, multiply and simplify fractions.

  • Answers as you type
  • Runs entirely in your browser
  • Free, no sign-up

Add, subtract, multiply or divide

Operation

Simplified answer

5/4

Mixed number: 1 1/4

As a decimal
1.25
As a percentage
125.00%
Common denominator used
4

Decimal to fraction

Closest simple fraction
3/8
Difference
0

How it works

Enter two fractions, pick an operation, and see the answer reduced to its lowest terms — plus the decimal and percentage equivalents. There is also a decimal-to-fraction converter underneath for going the other way.

a/b + c/d = (ad + cb) / bd, then divide top and bottom by their greatest common divisor

Example: 1/2 + 3/4 = 5/4, which is 1 1/4 as a mixed number, 1.25 as a decimal and 125%.

Questions people ask

How do I add fractions with different denominators?

Give them a common denominator first — multiply each fraction by the other's denominator — then add the numerators and simplify. The calculator shows which common denominator it used.

How do I simplify a fraction?

Divide the numerator and denominator by their greatest common divisor. For 18/24 that divisor is 6, giving 3/4.

How do I turn a decimal into a fraction?

Use the second panel. It finds the simplest fraction that matches your decimal closely, so 0.375 becomes 3/8 rather than 375/1000.

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