This calculator needs JavaScript to run. Please enable it in your browser, or read the guide below for the formulas and worked examples.
本计算器需要启用 JavaScript 才能运行，请在浏览器设置中开启；下方指南仍包含公式与示例。

Scientific Calculator

Full keypad calculator: arithmetic, powers, roots, logs and trig

Angle Unit

Result

Expression

Angle

Scientific Calculator — Complete Guide

This is a full keypad calculator that runs entirely in your browser: type an expression with the buttons, see it exactly as written, and evaluate it with one press. It handles everyday arithmetic as comfortably as the scientific functions — you never need it installed, and it works the same on phone and desktop.

What it supports

Arithmetic — +, −, ×, ÷ with standard operator precedence and unlimited parentheses.
Powers and roots — x² appends a square, xʸ inserts a general power, √ takes the square root.
Logs — ln is the natural log (base e), log is base 10.
Trigonometry — sin, cos and tan in degrees or radians, switchable above the keypad.
Percent — the % key divides by 100, so 50% evaluates to 0.5 and 200 × 10% to 20.
Constants — π and e are full-precision constants; implicit multiplication like 2π or 3(4+1) just works.

How the evaluation works

expression → token cleanup → JS evaluation → 12 significant digits examples: 2+3×4 = 14 sin(30) DEG = 0.5 √2 = 1.41421356 ln(e²) = 2

The calculator respects proper precedence: multiplication and division bind before addition and subtraction, and parentheses override everything. Results are rounded to 12 significant digits, which strips floating-point noise such as 0.9999999999 down to exactly 1.

Worked examples

Expression	Mode	Result
2 + 3 × 4	—	14
(2 + 3) × 4	—	20
sin(30)	DEG	0.5
5^2 + √(144)	—	37
log(1000)	—	3

Tips and limits

AC wipes the expression, ⌫ deletes one character at a time, and after pressing = the next digit starts a fresh calculation. Dividing by zero or leaving a parenthesis unclosed shows a clear error rather than a wrong number. For anything beyond about 15 digits of precision — very large exponents or symbolic algebra — you need dedicated software, not any pocket calculator.

科学计算器完整使用指南

这是一个完全在你的浏览器里运行的全键盘计算器：用按键拼出算式，显示区原样呈现，按一次 = 立即求值。日常四则和科学函数都信手拈来——无需安装，手机和电脑上体验一致。

支持哪些运算

四则运算——加、减、乘、除，标准优先级，括号不限层数。
乘方与开方——x² 追加平方，xʸ 插入任意次幂，√ 求平方根。
对数——ln 是自然对数（以 e 为底），log 是以 10 为底。
三角函数——sin、cos、tan 支持角度/弧度两种制式，在键盘上方切换。
百分比——% 键等于除以 100：50% 得 0.5，200 × 10% 得 20。
常量——π 和 e 都是全精度常量；2π、3(4+1) 这类省略乘号的写法可以直接算。

求值机制

算式 → 符号规整 → 求值 → 保留 12 位有效数字示例： 2+3×4 = 14 sin(30) DEG = 0.5 √2 = 1.41421356 ln(e²) = 2

计算器严格遵守运算优先级：乘除先于加减，括号优先级最高。结果保留 12 位有效数字，会把 0.9999999999 这类浮点噪声规整成干净的 1。

算例演示

算式	角度制	结果
2 + 3 × 4	—	14
(2 + 3) × 4	—	20
sin(30)	DEG	0.5
5^2 + √(144)	—	37
log(1000)	—	3

使用技巧与边界

AC 清空整个算式，⌫ 逐字符删除；按下 = 之后，下一个数字会自动开始新算式。除以零或括号不配对会得到明确的错误提示，而不是一个错数。若需要 15 位以上的精度、特大指数或符号代数，那要交给专业数学软件，任何掌上计算器都一样做不到。

Frequently Asked Questions

How do I use the scientific calculator?

Tap or click the keypad to build an expression — it shows in the display exactly as typed — then press = (or the Calculate button) to evaluate. The result appears both in the display panel and in the result card on the right.

What do DEG and RAD mean?

They control how trig functions interpret angles. In DEG mode, sin(30) means 30 degrees (result 0.5); in RAD mode the same input means 30 radians (about −0.988). Switch with the buttons above the keypad.

What operations are supported?

The four arithmetic operations, parentheses, percentages (50% becomes 0.5), powers (x² and xʸ), square roots, natural log (ln), base-10 log, the constants π and e, and sine/cosine/tangent. Implicit multiplication like 2(3+4) or 2π works too.

Last reviewed: October 5, 2026 · How we calculate · Sources: Standard IEEE 754 double-precision arithmetic