📖 Description
1. Why Choose This Site's Online Calculator?
In complex office and study environments, you may need to handle logic beyond simple addition, subtraction, multiplication, and division.
- No Installation Required: Open and use directly in your browser, compatible with mobile phones, tablets, and PCs.
- High Precision: Utilizes high-precision floating-point arithmetic logic to ensure the rigor of scientific calculations.
- Intuitive Interaction: Supports both keyboard input and mouse clicks, making long expressions clear at a glance.
2. Core Features Explained
This site's calculator can handle not only daily bills but also advanced mathematical challenges:
A. Basic Arithmetic Operations
- Supports addition ($+$), subtraction ($-$), multiplication ($\times$), and division ($\div$).
- Parentheses Operations: Perfectly supports multi-level nested parentheses
( ), automatically following priority logic.
- Percentage: Handles discount or ratio calculations with one click.
B. Scientific Calculation Functions
- Powers and Roots: Supports square ($x^2$), cube ($x^3$), arbitrary power ($x^y$), and square root ($\sqrt{x}$).
- Trigonometric Functions: Supports sine ($\sin$), cosine ($\cos$), tangent ($\tan$), and their inverse functions. Freely switch between Degree (Deg) or Radian (Rad) mode.
- Logarithmic Operations: Supports common logarithm ($\log_{10}$) and natural logarithm ($\ln$).
C. Mathematical Constants
- Built-in high-precision constants $\pi$ (pi) and $e$ (Euler's number), eliminating the need for manual input of approximations.
D. History and Memory
- Memory Keys: Supports $M+$ (Memory Add), $M-$ (Memory Subtract), $MR$ (Memory Recall), $MC$ (Memory Clear).
- History Review: The page sidebar displays recent calculation processes, facilitating data verification and preventing loss of previous step results.
3. Keyboard Shortcut Guide
To improve input efficiency, this tool fully supports physical keyboard mapping:
| Function |
Keyboard Key |
Description |
| Clear / Backspace |
Esc / Backspace |
Clear all or delete the last character |
| Calculate Result |
Enter or = |
Output the final result |
| Multiplication / Division |
* / / |
Quickly input operators |
| Parentheses |
( / ) |
Handle complex compound expressions |
| Power Operation |
^ |
Input $x^y$ operation |
4. Frequently Asked Questions (FAQ)
Q: How many decimal places can the calculation result retain?
A: By default, it displays 10-12 high-precision decimal places. For infinite repeating decimals, the system automatically performs scientific rounding based on the display width.
Q: Why is the result of $\sin(90)$ not $1$?
A: Please check the current unit mode. If in "Radian (Rad)" mode, the result of $\sin(90)$ will be different. Click the button to switch to "Degree (Deg)" mode.
Q: Will the history disappear after refreshing the page?
A: This tool currently saves the calculation history in the browser's local cache. As long as the cache is not cleared, you can retrieve the records upon reopening the page within a short period.
5. Why Choose This Site's Calculator?
- Zero Ad Interference: A clean input interface with no pop-up ads, ensuring your train of thought is uninterrupted.
- Responsive Layout: Automatically switches to "Scientific Mode" when used in landscape orientation on mobile phones, while maintaining "Standard Mode" in portrait orientation.
- Peak Performance: Based on front-end lightweight algorithms, operation latency is near zero and does not consume system resources.
- Completely Free: No login or paid subscription required, permanently free and open.