Fraction Calculator
Add, subtract, multiply and divide fractions or mixed numbers, plus fraction/decimal conversion.
Calculated locally in your browser.
- Enter as plain fractions or as mixed numbers (e.g. 2½) — the more intuitive everyday format for recipes and measurements.
- Result is automatically reduced to lowest terms using the greatest common divisor, and shown as a mixed number too when applicable.
- A separate Fraction ↔ Decimal converter for "what is 5/8 as a decimal" or the reverse — a different question from the four arithmetic operations.
- Handles negative numerators and denominators.
- Runs in your browser — instant, nothing uploaded.
Why this is private
- Calculated locally in your browser.
- Open your browser's DevTools → Network tab while using this tool — you won't see a request carrying your input, because it never leaves your device.
- Nothing you enter is uploaded to a server or shared with us — the processing happens entirely on your device.
Overview
Adds, subtracts, multiplies or divides two fractions or mixed numbers and simplifies the result to lowest terms, or converts a fraction to a decimal and back.
How to use it
- 1For arithmetic: choose "Fraction" or "Mixed number" input, enter both values, and choose add, subtract, multiply or divide.
- 2For conversion: switch to the "Fraction ↔ Decimal" tab and enter either a fraction or a decimal value.
Examples
Add
Input
1/2 + 1/3
Output
5/6
Divide
Input
3/4 ÷ 1/2
Output
3/2
Mixed number addition
Input
2½ + 1⅓
Output
23/6 = 3 5/6
Fraction to decimal
Input
5/8
Output
0.625
Frequently asked questions
What people use it for
Check homeworkConfirm a fraction addition or division answer, already reduced.
Scale a recipeWork out 3/4 × 2/3 of a quantity, or add mixed measurements like 2½ cups + 1⅓ cups directly, without converting to decimals first.
Combine measurementsAdd fractional inch or metric fractions from a plan, entered as mixed numbers if that's how the plan states them.
Convert a fraction spec to a decimal (or back)See what 5/8" is as a decimal, or find the nearest clean fraction for a decimal measurement.
Simplify an awkward fractionEnter it as `n/d + 0/1` to get the lowest-terms form.
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Fraction Calculator