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Key Features
Instant Calculation
Get accurate results in real time with our optimized algorithm.
Mobile Friendly
Fully responsive design. Works on all devices & screen sizes.
Privacy Focused
Your data stays on your device. We don't store any inputs.
100% Free
No hidden costs. This tool is completely free forever.
Adding and subtracting fractions requires a common denominator, while multiplying and dividing follow their own distinct rules — mixing these up is one of the most common sources of fraction errors.
This calculator applies the correct rule for whichever operation you choose and automatically simplifies the result.
How it works
Enter two fractions and choose an operation. The calculator applies the standard formula for that operation, then simplifies the result by dividing both the numerator and denominator by their greatest common divisor.
- Enter numerator 1.
- Enter denominator 1.
- Enter operation.
- Enter numerator 2.
- Enter denominator 2.
- Click Calculate to see your results.
Examples
Adding fractions with different denominators
1/2 + 1/3 = 3/6 + 2/6 = 5/6.
Who should use it
- Checking fraction arithmetic homework step by step.
- Combining measurements or recipe quantities given as fractions.
Industry applications
- Mathematics education
- Cooking, construction, and any field using fractional measurements
Advantages
- Supports all four basic operations in one tool.
- Automatically simplifies the result and shows the decimal equivalent.
Common mistakes to avoid
- Adding or subtracting numerators and denominators straight across without finding a common denominator first.
- Forgetting to flip (take the reciprocal of) the second fraction when dividing.
Best practices
- Always simplify your final answer to lowest terms — an unsimplified fraction like 4/8 is mathematically correct but conventionally should be reduced to 1/2.
Tips
- When dividing fractions, remember the shortcut "keep, change, flip": keep the first fraction, change division to multiplication, and flip the second fraction.