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Fraction Calculator

Add, subtract, multiply or divide two fractions and get the reduced result plus its decimal value.

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The Fraction Calculator turns First numerator, First denominator, Operation, Second numerator, Second denominator into Result numerator, Result denominator, Decimal value, instantly and for free. For instance, with First numerator = 1, First denominator = 2, Operation = Add (+), Second numerator = 1 and Second denominator = 3 it returns Result numerator = 5, Result denominator = 6 and Decimal value = 0.833.

How to use it

  1. Enter your values: First numerator, First denominator, Operation, Second numerator, Second denominator.
  2. Read the result instantly: Result numerator, Result denominator, Decimal value.

Frequently asked questions

What does the Fraction Calculator actually compute?

It takes First numerator, First denominator, Operation, Second numerator and Second denominator and derives Result numerator, Result denominator and Decimal value from them. The calculation is live as you type, so the result updates on every change.

What information do I need to provide?

5 values: First numerator, First denominator, Operation, Second numerator and Second denominator. Nothing else is required — no account, no file upload.

Can you show a worked example?

With First numerator = 1, First denominator = 2, Operation = Add (+), Second numerator = 1 and Second denominator = 3, the calculator returns Result numerator = 5, Result denominator = 6 and Decimal value = 0.833. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

What happens if I enter larger values?

It moves a lot. Using First numerator = 2, First denominator = 4, Operation = Subtract (−), Second numerator = 2 and Second denominator = 6 instead, Result numerator goes from 5 to 1 — which is why it is worth testing a few scenarios rather than trusting a single figure.

Which “Operation” option should I choose?

You can pick between « Add (+) », « Subtract (−) », « Multiply (×) » and « Divide (÷) ». Each one changes what the calculator works out, so switch and compare — the default is « Add (+) ».

What does it give for smaller values?

Scaled down to First numerator = 1, First denominator = 1, Operation = Add (+), Second numerator = 1 and Second denominator = 2, Result numerator comes out at 3. The relationship is worth checking at both ends before you rely on a single result.

When would I actually use this?

Reading a number written another way: a Roman numeral on a monument, a hexadecimal colour, a binary byte, or a fraction that needs reducing.

What is the most common mistake?

Assuming a decimal fraction survives a change of base. A tenth is exact in decimal and infinitely repeating in binary, which is why 0.1 + 0.2 is not 0.3 in most programming languages.

What is the difference between the Fraction Calculator and the Continued fraction calculator?

This one returns Result numerator and Result denominator; the Continued fraction calculator returns Continued fraction and Convergents. That is the whole difference — open the one whose figure you need.

Is there a tool for the next step?

Decimal to fraction calculator is the closest one after this: Convert a decimal number into a simplified fraction.

Further reading

All guides →
How-toHow to Multiply and Divide Fractions: Multiply Across, Flip to DivideMultiplying fractions needs no common denominator — just multiply across. Dividing means multiplying by the reciprocal. Learn both with worked examples and how to simplify.How-toHow to Add and Subtract Fractions: Common Denominator, Combine, SimplifyYou can only add or subtract fractions that share a denominator. Learn to find a common denominator, combine the numerators, and simplify the result, with a worked example.How-toHow to Convert a Percentage to a Fraction: Over 100, Then ReduceA percentage is just a fraction out of 100. Put the number over 100, reduce to lowest terms, and handle decimal percentages like 12.5% by clearing the decimal first. With examples.How-toHow to Round Numbers: Round Half Up, Round Half to Even, and MoreRound to any decimal place or number of significant figures, and learn when to use round half up versus round half to even to avoid bias.How-toHow to Find Prime Factors: Factor Trees and the Division MethodBreak any whole number into its prime building blocks with a factor tree or repeated division — and write the result as a clean prime factorization with exponents.How-toHow to Do Long Division: Divide, Multiply, Subtract, Bring DownLong division breaks a big division into a repeating four-step cycle. Learn the divide-multiply-subtract-bring-down loop and how to read the remainder, with a worked example.
Fraction Calculator — OneKitly