Result
Scientific Calculator
Evaluate arithmetic, powers, roots, logarithms and trigonometric expressions.
How to check this result
Use parentheses to make the order of operations clear, especially when an expression contains both multiplication and addition.
Method and assumptions
The calculator follows standard arithmetic precedence: parentheses, powers and roots, multiplication and division, then addition and subtraction.
Before making a decision
Check that the angle mode and notation match what your class, worksheet or source uses.
Check grouping and operation order
Method and inputs
Use parentheses to show which operation should happen first. Multiplication and division precede addition and subtraction. Powers, roots and trigonometric functions should be checked against the expression and angle convention displayed by the tool.
Worked example
The expression 2 + 3 × 4 gives 14, while (2 + 3) × 4 gives 20. A square root of 81 gives 9. These simple checks help confirm that an expression was entered as intended.
Limits and common mistakes
Division by zero has no finite result. A real square root of a negative number is undefined. Floating-point arithmetic may show small rounding differences, so avoid treating every displayed digit as exact.
How should I check an unfamiliar expression?
Break it into smaller steps and estimate the expected magnitude. For trigonometry, confirm the angle unit before relying on the output; degrees and radians produce different results.
Content updated: 2026-10-03.