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Fraction calculator

Add, subtract, multiply, and divide fractions with exact reduced answers and an equal-parts preview.

Equal-parts preview
First13
Second16
Result12

1/3 + 1/6 = 1/2

Approximate decimal: 0.5. Blocks show magnitude for fractions within one whole and up to 24 parts.

Processed on your device

How it works & useful details

How it works & limits

Enter integer numerators and nonzero denominators of up to 30 digits. Negative denominators are normalized and results are reduced using exact integer arithmetic. Division by a zero fraction is undefined.

The reduced fraction is exact. The optional decimal preview uses floating-point arithmetic rounded to 12 significant digits; it is not an exact decimal expansion.

Your working space

Change the values to explore the preview. Use the action below to create a copyable, downloadable result. All calculations stay on this device; refreshing clears your work.