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Basic Calculator – Addition, Subtraction, Multiplication & Division

Sometimes you just need a quick, reliable calculator without launching an app or finding your phone. This basic online calculator handles the four fundamental arithmetic operations — addition, subtraction, multiplication, and division — with full decimal support and standard order of operations.

Use it directly in your browser on any device. It's ideal for quick mental arithmetic checks, splitting costs, calculating discounts, or any everyday number task that doesn't require a specialised tool.

How to use the Basic Calculator

Type your numbers and operators using the keypad or your keyboard.

Results update instantly as you type.

Press = or Enter to complete the calculation. Press C to clear.

Order of Operations (PEMDAS/BODMAS)
Priority	Operation	Example
1st	Parentheses / Brackets	(2 + 3) × 4 = 20
2nd	Exponents / Orders	2³ = 8
3rd	Multiplication	3 × 4 = 12
3rd	Division	12 ÷ 4 = 3
4th	Addition	5 + 3 = 8
4th	Subtraction	8 − 3 = 5

Basic Calculator FAQ

Does this follow order of operations?

Yes. The calculator follows standard PEMDAS/BODMAS: multiplication and division are evaluated before addition and subtraction. Use parentheses to control the order of operations in complex expressions.

Can I use it on mobile?

Yes, it's fully responsive and works on any smartphone, tablet, or desktop browser without downloading an app.

What is the difference between this and a scientific calculator?

A basic calculator handles the four arithmetic operations. A scientific calculator adds trigonometry, logarithms, exponents, and other advanced functions.

How do I calculate a percentage using a basic calculator?

Multiply by the percentage divided by 100. For 15% of 80: 80 × 0.15 = 12. Or use the dedicated percentage calculator for more complex percentage problems.