Basic
Frequently Asked Questions
Can I use the calculator without a mouse?
Absolutely! The calculator is fully keyboard-accessible. Type your expressions, use Enter to calculate, Backspace to delete, and arrow keys to move around.
How do I calculate sine, cosine, or tangent?
Switch to Scientific Mode. You can use sin(x), cos(x), and tan(x). For example: sin(30) = 0.5 in degrees. You can also toggle to radians using the Deg/Rad button.
What is the difference between Degree and Radian mode?
Degrees (°) are easier for most humans (like 90° for a right angle), while radians (π) are used more in advanced math. Toggle the mode based on your use case — trig functions adjust accordingly.
Can I enter complex expressions like nested parentheses?
Yes! The calculator supports nested expressions like: 3 * (4 + sqrt(9)) - sin(45). Missing parentheses are automatically closed at evaluation.
Is this calculator really free to use?
Yes. It’s 100% free. Your expressions and history stay in your browser only — no accounts or sign-ups needed.
Can I use Ctrl+C / Ctrl+V to copy and paste?
Absolutely. You can paste any valid expression (like 5 + 2 * sin(30)) directly into the calculator. You can also click into the display and edit it live like a notepad.
What happens if I press Enter with an incomplete expression?
The calculator auto-closes missing parentheses and gives a helpful error if the math expression is malformed. This helps avoid frustrating blank results.
Does it work on mobile or tablet devices?
Yes. The calculator is fully mobile-responsive. Buttons are touch-friendly and you can type with your mobile keyboard if preferred.
Can I use functions like log, ln, sqrt, pi, and factorial?
Yes! You can use advanced functions like log10(x), ln(x), sqrt(x), pi, e, and x! (factorial). Example: log(100) gives 2; ln(e) gives 1.
Will my previous calculations be saved?
Yes. Your recent history is saved locally in your browser and restored when you revisit the site. You can also clear it anytime.
Does this work offline?
If the page is cached by your browser, it may work offline temporarily. However, it’s designed for online use to ensure fast updates and improvements.