Fraction Calculator
Add, subtract, multiply and divide fractions with full working.
Enter your values
Enter the first numerator you are working with.
Enter the first denominator you are working with.
Choose one of: Add, Subtract, Multiply, Divide.
Enter the second numerator you are working with.
Enter the second denominator you are working with.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Result
- 19/12
- Mixed number
- 1 7/12
- Decimal
- 1.583333
- Percentage
- 158.333%
Working
- 13/4 + 5/6 = 38/24
- 2Divide both by GCD 2 → 19/12
Quick answer
To add fractions, put them over a common denominator; to multiply, multiply numerators and denominators; to divide, invert and multiply.
a/b + c/d = (ad + bc) / bd
At a glance
| What it does | Add, subtract, multiply and divide fractions with full working. |
|---|---|
| Category | Math |
| Inputs needed | First numerator, First denominator, Operation, Second numerator, Second denominator |
| Main output | Result |
| Formula | a/b + c/d = (ad + bc) / bd |
| Cost | Free — no sign-up, no download |
How to use the Fraction Calculator
- 1Enter the first fraction.
- 2Choose the operation.
- 3Enter the second fraction and read the simplified answer.
Inputs explained
- First numerator
- Enter the first numerator you are working with.
- First denominator
- Enter the first denominator you are working with.
- Operation
- Choose one of: Add, Subtract, Multiply, Divide.
- Second numerator
- Enter the second numerator you are working with.
- Second denominator
- Enter the second denominator you are working with.
Worked example
Using the values the calculator loads with:
Inputs
- First numerator3
- First denominator4
- OperationAdd
- Second numerator5
- Second denominator6
Results
- Result19/12
- Mixed number1 7/12
- Decimal1.583333
- Percentage158.333%
- 3/4 + 5/6 = 38/24
- Divide both by GCD 2 → 19/12
Frequently asked questions
How do you divide fractions?
Flip the second fraction and multiply: 3/4 ÷ 5/6 = 3/4 × 6/5 = 18/20 = 9/10.
What is simplifying?
Dividing numerator and denominator by their greatest common divisor so the fraction is in lowest terms.
What do I need to enter into the Fraction Calculator?
Just 5 values: first numerator, first denominator, operation, second numerator, second denominator. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Fraction Calculator work out the answer?
To add fractions, put them over a common denominator; to multiply, multiply numerators and denominators; to divide, invert and multiply. It applies the formula a/b + c/d = (ad + bc) / bd and shows the working so you can check each step by hand.
Is the Fraction Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.