Free Basic Calculator - Simple Math & Arithmetic
Standard basic calculator for simple arithmetic, percentages, and everyday math problems.
Formula & Methodology
The Basic Calculator evaluates standard arithmetic between two operands, following the usual order of operations when several steps are chained. Percentage mode converts the second operand into a fraction of the first (a × b / 100), so 250 with 15% returns 37.5. Division by zero is rejected because it is undefined.
- Result = a ⊕ b, where ⊕ ∈ { +, −, ×, ÷ }
- Percentage of a number = (a × b) / 100
- Percentage change = ((New − Old) / Old) × 100
Worked Example
Using the Basic Calculator: apply the formula above to your input values. For instance, Result = a ⊕ b, where ⊕ ∈ { +, −, ×, ÷ }, then Percentage of a number = (a × b) / 100. The tool performs each step instantly and shows the result.
Frequently Asked Questions
What operations does the basic calculator support?
Addition, subtraction, multiplication and division for everyday arithmetic, with instant results as you type.
Does it follow order of operations?
It evaluates entries in sequence for simple sums; for complex expressions with mixed operators, enter steps carefully.
Can I use it for percentages?
For percentage-specific work our Percentage Calculator is better suited, but you can do simple percent math here by dividing and multiplying.