What does the Fraction Calculator do?

Add, subtract, multiply and divide fractions. Shows simplified result, mixed number and decimal. All calculations are performed in your browser using official UK rates and thresholds.

How accurate are the results?

This calculator uses standard mathematical algorithms and provides results accurate to the precision shown. For very large numbers or high-precision requirements, results are rounded to a reasonable number of decimal places.

Can I use this for schoolwork?

Yes. This calculator is suitable for GCSE, A-level and university-level mathematics. It follows standard mathematical conventions used in UK education.

Fraction Calculator

Add, subtract, multiply and divide fractions. Shows simplified result, mixed number and decimal.

Last updated: April 2026 · Source: BBC Bitesize — Fractions

5/6

5/6 = 0.833333

Disclaimer

This calculator is provided for informational purposes only and should not be considered as financial or tax advice. All calculations are performed locally in your browser — no personal data is collected or sent to our servers. Rates and thresholds are sourced from HMRC and GOV.UK and are updated for the current tax year. Always verify results with HMRC or consult a qualified professional before making financial decisions.

How It Works

This calculator performs addition, subtraction, multiplication and division on fractions and mixed numbers. It automatically simplifies results to their lowest terms by dividing numerator and denominator by their greatest common divisor (GCD).

To add or subtract fractions with different denominators, the calculator finds the least common denominator (LCD), converts both fractions, then combines the numerators. For multiplication, it multiplies numerators together and denominators together. For division, it multiplies by the reciprocal of the second fraction.

Mixed numbers (like 2 3/4) are supported — the calculator converts them to improper fractions internally, performs the operation, then converts back. Results are shown as both an improper fraction and a mixed number where applicable.

Example: Adding 2/3 + 3/4

Find LCD of 3 and 4: LCD = 12
Convert: 2/3 = 8/12 and 3/4 = 9/12
Add numerators: 8 + 9 = 17
Result: 17/12 = 1 5/12

Source: BBC Bitesize — Fractions

Frequently Asked Questions

What does the Fraction Calculator do?: Add, subtract, multiply and divide fractions. Shows simplified result, mixed number and decimal. All calculations are performed in your browser using official UK rates and thresholds.
How accurate are the results?: This calculator uses standard mathematical algorithms and provides results accurate to the precision shown. For very large numbers or high-precision requirements, results are rounded to a reasonable number of decimal places.
Can I use this for schoolwork?: Yes. This calculator is suitable for GCSE, A-level and university-level mathematics. It follows standard mathematical conventions used in UK education.