Basic Calculator
A simple four-function calculator for everyday arithmetic — add, subtract, multiply, divide with parentheses support.
How to use the Basic Calculator
- Enter your inputs into the Basic Calculator above.
- Results update instantly as you type — no submit button needed.
- Adjust any value to see how the result changes in real time.
Order of operations
PEMDAS: Parentheses, Exponents, Multiplication & Division, Addition & Subtraction
Operations of the same priority are evaluated left to right. Parentheses override the default order. This basic calculator handles the four operations plus parentheses.
Worked example
15 + 6 × 2 = 27 (multiplication before addition). (15 + 6) × 2 = 42 (parentheses override). 100 / 4 / 5 = 5 (left-to-right division).
Frequently asked questions
Why is 2 + 3 × 4 equal to 14, not 20?
Order of operations (PEMDAS): multiplication happens before addition. 3 × 4 = 12 first, then 2 + 12 = 14. Use parentheses if you want addition first: (2 + 3) × 4 = 20.
How do I do percentages on this calculator?
For "X% of Y": Y × X / 100. For "increase Y by X%": Y × (1 + X/100). For "decrease Y by X%": Y × (1 − X/100). Or use our dedicated percentage calculator.
Can I do square root or powers?
Not with the basic four functions. Use our scientific calculator for advanced operations like trig, log, powers and roots.