Fraction Calculator — Add, Subtract, Multiply, Divide

What this Fraction Calculator does

This English-language fraction calculator handles addition, subtraction, multiplication, and division for any combination of fractions, mixed numbers (like 2 1/3), whole numbers, and decimals. Enter 3/4, 2 1/3, 5, or 0.25 — the tool auto-converts decimals to their exact fraction form before operating. Every result is fully simplified: the calculator finds the GCD, reduces the fraction, and displays the mixed-number form alongside the decimal equivalent. Most importantly, it shows every step: finding the common denominator, rewriting both fractions, combining numerators, and reducing. Students see the method, not just the answer. 100% client-side — your data never leaves your browser. No uploads, no tracking, no server logs. Pi has been computed to over 105 trillion digits, yet the arithmetic underneath it all still comes down to the same fraction rules you learned in school.

Features

Four operations in one. Add, subtract, multiply, or divide any two fractions in a single interface — no need to switch tools.
Mixed number and whole number support. Accepts mixed numbers like 2 1/3 and whole numbers like 5 alongside standard fractions, so you can combine measurements without manual conversion.
Decimal-to-fraction conversion. Type 0.625 and the calculator converts it to 5/8 before operating. Great for quickly converting a decimal you pulled from a spreadsheet into an exact fraction form.
Auto-simplification via GCD. Results are always reduced to lowest terms using the greatest common divisor. 4/8 becomes 1/2 automatically — no extra step required.
Step-by-step walkthrough. Every calculation shows the common denominator, rewritten fractions, combined numerator, and final reduction so you can follow — and learn — the full method.
Privacy-first, no sign-up. All computation runs in your browser. Nothing is sent to a server, nothing is logged, and no account is needed. Works offline once the page has loaded.

How to use the Fraction Calculator

Enter both values, choose an operation, and hit Calculate. Results appear instantly with the full reduction shown.

Enter the first value. Type a fraction (3/4), a mixed number (2 1/3), a whole number (5), or a decimal (0.25) in the first input field.
Choose an operation. Select addition, subtraction, multiplication, or division from the operator selector between the two inputs.
Enter the second value. Fill in the second field using any of the same formats. Mixed numbers and fractions can be combined freely — for example 2 1/3 + 3/4.
Click Calculate. The result appears immediately: simplified fraction, mixed-number form (when applicable), decimal equivalent, and the full step-by-step breakdown.
Copy the result. Use the Copy button to grab the simplified result to your clipboard for use in a document, chat, or [percentage calculator](/en/percentage-calculator/) workflow.

Common use cases

Homework — adding and subtracting fractions. Middle-school problems like 5/6 − 1/4 are a classic stumbling block. The step-by-step output shows exactly how to find the common denominator (12), rewrite both sides, and subtract — so students learn the method rather than just copying a number.
Cooking and recipe scaling. Halving a recipe that calls for 3/4 cup gives 3/8 cup — not an obvious mental calculation. Enter 3/4 ÷ 2 and get the exact fraction back, ready to measure.
Carpentry and DIY measurements. Combining board lengths like 2 1/4 in + 5/8 in is exactly the kind of mixed-number addition that trips people up on job sites. Get a precise fraction result you can mark on a tape measure.
Converting decimals to fractions. Enter 0.375 to see it expressed as 3/8. Useful when a datasheet gives a decimal value but your plans call for a fractional dimension. For unit conversions between measurement systems, the [Length Converter](/en/length-converter/) pairs well with this workflow.
Music — note durations and time signatures. A dotted quarter note in 6/8 time spans 3/8 of a measure. Treating durations as fractions lets you verify whether a sequence of notes fills a bar without resorting to decimal approximations.

Frequently asked questions

Can I use this as a mixed number calculator?

Yes. Type mixed numbers in the form 2 1/3 (whole part, space, then the fraction). The calculator converts them internally, performs the operation, and returns the result in both fraction and mixed-number form. It also handles mixed number solver tasks like 3 2/5 − 1 3/4 in one step.

Why does my result look different from what I expected when dividing fractions?

Dividing by a fraction means multiplying by its reciprocal — so 3/4 ÷ 1/2 becomes 3/4 × 2/1 = 3/2. This is a common source of confusion. The step-by-step breakdown shows the inversion explicitly so you can see exactly where the flip happens.

Does the calculator always simplify the result?

Yes. Every result is reduced to lowest terms using the greatest common divisor before being displayed. A raw result of 6/9 will be shown as 2/3. The step showing the GCD reduction is included in the walkthrough so you can reproduce it by hand if needed.

Is my data sent to a server or stored anywhere?

No. The entire calculation runs in your browser using JavaScript. Nothing is transmitted to any server, no cookies are set, and no input is logged. The page works fully offline after the initial load — your inputs never leave your device.

How does the calculator handle negative mixed numbers?

A negative mixed number like −2 1/3 means −(2 + 1/3) = −7/3, not −2 + 1/3. Enter it as -2 1/3 and the tool applies the negative sign to the entire value. Getting this wrong is one of the most common pitfalls in fraction arithmetic, so the step display makes the conversion explicit.

Can I use this as a fraction and whole number calculator?

Absolutely. Enter any whole number (like 7) alongside a fraction (3/8) and the calculator treats the whole number as 7/1 internally. This covers use cases like multiplying a recipe quantity by a whole number or finding what fraction of a whole a measurement represents. If you also need to work with ratios and percentages, the [percentage calculator](/en/percentage-calculator/) covers that side of the math.