📐 Maths Calculator UK - GCSE & A-Level
Free advanced maths calculator for UK students. Featuring basic arithmetic, scientific functions, percentage calculations, and fraction conversions. Perfect for homework, revision, and everyday calculations. Follows BIDMAS/BODMAS order of operations.
Percentage Calculator
Find X% of a Number
What % is X of Y?
Increase/Decrease by %
Add/Remove VAT (20%)
Fraction Calculator
Add/Subtract Fractions
Simplify Fraction
Fraction to Decimal
Decimal to Fraction
📚 BIDMAS/BODMAS Order of Operations
The correct order to perform mathematical operations:
| Letter | Meaning | Example | Result |
|---|---|---|---|
| B | Brackets | (2 + 3) × 4 | 20 |
| I/O | Indices/Orders (Powers) | 2 + 3² | 11 |
| D | Division | 10 + 8 ÷ 2 | 14 |
| M | Multiplication | 10 - 2 × 3 | 4 |
| A | Addition | 5 + 3 | 8 |
| S | Subtraction | 10 - 4 | 6 |
📏 Essential GCSE Maths Formulas
Area Formulas
- Rectangle: A = length × width
- Triangle: A = ½ × base × height
- Circle: A = πr²
- Trapezium: A = ½(a + b) × h
- Parallelogram: A = base × height
Volume Formulas
- Cuboid: V = l × w × h
- Cylinder: V = πr²h
- Cone: V = ⅓πr²h
- Sphere: V = ⁴⁄₃πr³
- Prism: V = area of cross-section × length
Pythagoras & Trigonometry
- Pythagoras: a² + b² = c²
- Sin: sin(θ) = opposite/hypotenuse
- Cos: cos(θ) = adjacent/hypotenuse
- Tan: tan(θ) = opposite/adjacent
Algebra
- Quadratic: x = (-b ± √(b²-4ac)) / 2a
- Gradient: m = (y₂-y₁)/(x₂-x₁)
- Straight line: y = mx + c
- Circle: x² + y² = r²
💡 Maths Tips for UK Students
📝 Exam Techniques
- Always show your working - marks are given for method
- Check your answers by substituting back
- Read questions carefully - underline key words
- Use estimation to check calculator answers
- Keep track of significant figures
🔢 Quick Mental Maths
- To multiply by 5: ×10 then ÷2
- To multiply by 25: ×100 then ÷4
- To find 10%: move decimal one place left
- To find 1%: move decimal two places left
- Square numbers to 15: know them by heart
⚡ Calculator Skills
- Learn your calculator's fraction button
- Use ANS to chain calculations
- Know how to input negative numbers correctly
- Use brackets liberally to ensure order
- Check DEG/RAD mode for trigonometry
⚠️ Common Maths Mistakes to Avoid
❌ BIDMAS Errors
Wrong: 2 + 3 × 4 = 20
Right: 2 + 3 × 4 = 14
Always do multiplication and division before addition and subtraction!
❌ Negative Number Errors
Wrong: -3² = 9
Right: -3² = -9 (but (-3)² = 9)
The square only applies to the 3, not the negative sign, unless you use brackets.
❌ Fraction Mistakes
Wrong: ½ + ¼ = ²⁄₆
Right: ½ + ¼ = ²⁄₄ + ¼ = ¾
You must find a common denominator before adding fractions.
❌ Percentage Confusion
Wrong: 50% of 80 = 80 ÷ 50
Right: 50% of 80 = 80 × 0.5 = 40
Convert percentage to decimal (÷100) then multiply.
❓ Frequently Asked Questions
🔗 Official UK Maths Resources
Trusted resources for GCSE and A-Level mathematics:
📚 BBC Bitesize
Free GCSE and A-Level maths revision resources with videos, quizzes, and practice questions from the BBC.
Visit BBC Bitesize →🎓 Corbettmaths
Extensive collection of GCSE maths videos, worksheets, and practice papers. Free for all UK students.
Visit Corbettmaths →📐 DrFrostMaths
Comprehensive maths resources covering KS3, GCSE, and A-Level with interactive questions and solutions.
Visit DrFrostMaths →📝 Maths Genie
Free GCSE maths revision including past papers, mark schemes, and topic-based practice from all exam boards.
Visit Maths Genie →🏫 AQA Maths Resources
Official AQA exam board resources including specifications, past papers, and mark schemes for GCSE and A-Level.
Visit AQA →📖 Edexcel/Pearson Maths
Official Edexcel resources for GCSE and A-Level maths including practice papers and examiner tips.
Visit Pearson →About This Maths Calculator
This free maths calculator is designed for UK students studying GCSE, A-Level, or simply needing a reliable calculator for everyday arithmetic. It features multiple modes including basic arithmetic, scientific functions, percentage calculations, and fraction operations.
The calculator follows the BIDMAS/BODMAS order of operations, matching what you learn in UK schools. Whether you're revising for exams, checking homework, or calculating percentages and VAT, this calculator provides accurate, instant results.
Disclaimer: While this calculator is useful for learning and checking work, it is not a substitute for understanding the mathematical concepts. For exam preparation, always practice with a physical calculator approved by your exam board, as exam conditions may differ from using online tools.
🔥 Popular Calculators:
💡 Pro Tips for Accurate Results ▼
- Double-check your input values before calculating
- Use the correct unit format (metric or imperial)
- For complex calculations, break them into smaller steps
- Bookmark this page for quick future access
📊 Understanding Your Results ▼
Our Math Calculator provides:
- Instant calculations - Results appear immediately
- Accurate formulas - Based on official UK standards
- Clear explanations - Understand how results are derived
- 2025/26 updated - Using current rates and regulations
❓ Common Questions ▼
Is this calculator free?
Yes, all our calculators are 100% free to use with no registration required.
Are the results accurate?
Our calculators use verified formulas and are regularly updated for accuracy.
Can I use this on mobile?
Yes, all calculators are fully responsive and work on any device.