Basic Calculator
A simple, accurate calculator for everyday sums: add, subtract, multiply, divide and percentages, with keyboard support.
About the Basic Calculator
Type with your keyboard or tap the keys. The calculator follows the normal order of operations (multiplication and division before addition and subtraction) and works in exact decimal, so 0.1 + 0.2 shows 0.3, not 0.30000000000000004.
The percent key works like a phone calculator: 200 + 10% gives 220, and 50 × 10% gives 5.
The formula
Order of operations: brackets, powers, × and ÷, then + and −
How to read your result
- The small line shows your sum; the large number is the answer.
- Press Ans to reuse the last answer, and open History to see earlier results.
Worked example
A shopping total: (12.50 + 7.25) × 3
- Brackets first: 12.50 + 7.25 = 19.75
- Then multiply: 19.75 × 3 = 59.25
- Percent: 59.25 + 10% = 65.175
Questions people ask
Can I use my keyboard?
Yes: digits, + − * /, Enter or = for equals, Backspace to delete and Esc to clear.
Why is 2 + 3 × 4 = 14 and not 20?
Multiplication is done before addition, as in all standard maths: 3 × 4 = 12, then 2 + 12 = 14.