数学求值器
根据输入计算、校验或分析数学求值。
使用步骤
如何使用
- Enter an expression such as (12.5 × 4) / 2 or sqrt(81) + pi.
- Select Evaluate expression and review the result or any input guidance.
- Copy the result for your notes or next calculation.
Common arithmetic and functions
Use +, -, *, /, %, ^, parentheses, decimal numbers, pi, e, and functions such as sqrt, abs, sin, cos, tan, log, ln, exp, floor, ceil, round, min, and max. Multiplication must be written explicitly, such as 2*pi.
Safe local evaluation
The expression is tokenized and evaluated by a small recursive-descent parser in the browser. It never uses eval, Function, or remote services. Expressions are limited to 500 characters and function arguments are limited to 20 items.
常见问题
你可能还想知道
Can I enter JavaScript?
No. Only the documented arithmetic operators, constants, and math functions are accepted; JavaScript code is never executed.
Which angle unit do trigonometric functions use?
sin, cos, and tan use radians, matching standard JavaScript math conventions.
What happens for an invalid expression?
The tool keeps the result hidden and explains where the expression is invalid so you can correct it.
Is my calculation uploaded?
No. Parsing and calculation happen locally in your browser.