Fraction calculator

Add, subtract, multiply or divide fractions and mixed numbers.

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Fraction calculator processes your input in this browser. Inputs and results are excluded from analytics. Recent tools save tool names, visit counts and last-visit times. Saved tools store only their names. Draft saving is optional and stays on this device; delete saved text with the draft controls. Loading text from a URL is optional and contacts that server; its URL and your IP address are visible to the server. An optional “Use in” action keeps a handoff in this tab. The next tool removes it on arrival and ignores it if more than a minute has passed.

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First fraction or mixed number

Second fraction or mixed number

Operation

Answer

…

Use a common denominator to add or subtract. Multiply numerators and denominators to multiply; invert the second fraction to divide. Every result is reduced by the greatest common divisor.

More results

Precision and calculation record

Decimal places in numeric results and text downloads

Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.

Saved scenario

Save the current answer, then change an input to compare. This clears when you leave.

Formula and assumptions

Enter integers, fractions such as −3/4, or mixed numbers such as −1 1/2. Exact integer arithmetic preserves the fraction; only the decimal is approximate. Each input is limited to 60 characters.

Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.

Scratch calculator

Check another calculation

Use +, −, ×, ÷, parentheses and %. A percentage is divided by 100. This does not change the main tool.

Reset reloads the tool with its starting values and releases open files and device controls. Saved drafts stay on this device until you delete them.

Links include your inputs and settings. Anyone with the link can see them, so leave out private text. Files and generated results are left out; random draws run again.

Keyboard shortcuts

Updated 2026-09-26

Using Fraction calculator

Use a common denominator to add or subtract. Multiply numerators and denominators to multiply; invert the second fraction to divide. Every result is reduced by the greatest common divisor.

Enter integers, fractions such as −3/4, or mixed numbers such as −1 1/2. Exact integer arithmetic preserves the fraction; only the decimal is approximate. Each input is limited to 60 characters.

Next: Scientific calculator

A worked example

With first fraction or mixed number = 1/2, second fraction or mixed number = 3/4, operation = 0, the simplified fraction is 5/4.

Next: Graph functions online

Before you use the result

Enter integers, fractions such as −3/4, or mixed numbers such as −1 1/2. Exact integer arithmetic preserves the fraction; only the decimal is approximate. Each input is limited to 60 characters.

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ToolOctopus. “Fraction calculator.” Updated 2026-09-26. https://tooloctopus.com/fraction-calculator.

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