Fraction Calculator — Free Online Tool
Add, subtract, multiply & divide fractions with simplified results. · No signup · Works on mobile
100% private: your data is processed in your browser. Nothing is uploaded to our servers.
How to use the fraction calculator
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Enter the numerator and denominator of both fractions (whole-number parts optional).
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Choose the operation: + − × ÷.
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Read the simplified result, mixed-number form, decimal value, and the steps.
What does this tool do?
This free fraction calculator adds, subtracts, multiplies, and divides any two fractions and instantly shows the answer fully simplified, as a mixed number, and as a decimal. It also displays the working — common denominators and GCD simplification — so students can follow every step.
How does the fraction calculator work?
The tool converts inputs to improper fractions, applies the operation (cross-multiplying for addition/subtraction using the least common denominator), then reduces the result by dividing numerator and denominator by their greatest common divisor computed with Euclid's algorithm.
Frequently Asked Questions
How do I add fractions with different denominators?
Find the least common denominator (LCD), convert both fractions, then add the numerators. For 1/4 + 1/6: LCD of 4 and 6 is 12, so 3/12 + 2/12 = 5/12. This calculator shows the LCD and conversion steps automatically.
Why do you flip the second fraction when dividing?
Dividing by a fraction is the same as multiplying by its reciprocal because division asks "how many times does it fit?". So 3/4 ÷ 1/2 = 3/4 × 2/1 = 6/4 = 3/2. Half fits into three-quarters one and a half times.
Is the fraction calculator really free?
Yes — 100% free with no hidden charges, trial limits, or premium tiers for core features. You don't need to create an account or enter an email address. The site is supported by non-intrusive display ads, which keeps every tool free for everyone.
Is my data private when using the fraction calculator?
Completely. The fraction calculator runs entirely in your browser using JavaScript — nothing you type or upload is sent to our servers. When you close the tab, your data is gone. This makes it safe for confidential documents, financial figures, and personal information.
Does the fraction calculator work on mobile phones?
Yes. The fraction calculator is built mobile-first and works on any phone or tablet with a modern browser — iPhone (Safari), Android (Chrome), and everything in between. The layout adapts to small screens, so buttons and inputs stay easy to tap on a 375px-wide display.
Do I need to install anything to use the fraction calculator?
No. The fraction calculator works directly in your web browser — no downloads, no extensions, no signup. Just open the page, use the tool, and get your result instantly. It works on Windows, macOS, Linux, ChromeOS, iOS, and Android.