Trigonometry
Calculate sine, cosine, tangent, and inverse trigonometric functions. Switch between degrees and radians when needed.
FREE ONLINE SCIENTIFIC CALCULATOR
Free Scientific Calculator Online
Calculate trigonometric functions, powers, roots, and logarithms in one simple place. Use the scientific calculator directly in your browser—no download or account needed.
Free to useBrowser-basedDesktop & mobile
Online scientific calculator
Start Calculating
Enter an expression with your keyboard or select the buttons below. Choose degrees or radians before using trigonometric functions.
Scientific Calculator
Your calculations run in this browser
Ready for your calculation
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Keyboard: Enter = calculate · Esc = clear · Backspace = deleteAngle: Degrees
What you can do
Scientific Math, Made Simpler
Use common scientific functions without installing a separate application.
Powers and Roots
Evaluate square roots, powers, and expressions such as 2^8 or sqrt(144) with parentheses and standard operation order.
Logarithms
Use log for base-10 logarithms and ln for natural logarithms, useful in algebra, science, and other coursework.
Math Constants
Insert pi and e for calculations involving circles, exponential growth, and many common mathematical formulas.
Keyboard Support
Type numbers and operators directly. Press Enter to calculate, Backspace to edit, or Escape to clear the expression.
Responsive Layout
Use the calculator on a desktop, tablet, or phone. The keypad adapts to smaller screens for easier tapping.
Quick start
How to Use the Scientific Calculator
Follow these steps to enter expressions and check your results.
Choose an angle mode
Select DEG for degrees or RAD for radians before calculating sine, cosine, tangent, or their inverse functions.
Enter your expression
Use the keypad or keyboard. Add parentheses to group parts of an expression, and use ^ to enter a power.
Calculate and review
Press = or Enter to see the result. Your recent expressions appear in the history panel so you can reuse them.
Math toolkit
Supported Functions
A quick reference to the main operators and scientific functions available on this page.
| Category | Input | Example | Purpose |
|---|---|---|---|
| Arithmetic | + - * / | (8+2)*3 | Basic calculations |
| Trigonometry | sin(x), cos(x), tan(x) | sin(30) | Trigonometric ratios |
| Inverse trig | asin(x), acos(x), atan(x) | asin(0.5) | Find an angle from a ratio |
| Logarithms | log(x), ln(x) | log(100) | Base-10 and natural logs |
| Powers and roots | ^, sqrt(x) | sqrt(81), 2^5 | Exponentiation and square roots |
| Other functions | abs(x), x! | abs(-7), 5! | Absolute value and factorial |
| Constants | pi, e | 2*pi | Pi and Euler's number |
Note: Factorial is supported for non-negative integers up to 170. Logarithms require positive inputs. Some expressions have no real-number result.
Try an example
Example Calculations
Select any example to load it into the calculator.
Before you begin
Compatibility and Accuracy
Works in a modern browser
Use a current version of Chrome, Firefox, Safari, or Edge with JavaScript enabled. An internet connection is required to load this page, but the calculations themselves are processed locally by your browser.
Understand the result
This tool is intended for learning, everyday calculations, and checking mathematical work. Results use JavaScript's standard floating-point number precision, so very large values or calculations that require exact symbolic answers may be rounded. Check important results independently when precision is critical.
Use the correct angle setting
Trigonometric results depend on the selected angle unit. For example, sin(90) equals 1 in degree mode, while sin(pi/2) equals 1 in radian mode.
Common questions
Scientific Calculator FAQ
Answers to a few common questions about scientific calculations.
What is a scientific calculator used for?
A scientific calculator handles regular arithmetic along with functions such as trigonometry, logarithms, powers, and roots. It is useful for many school, science, and engineering calculations.
What is the difference between DEG and RAD?
They are two ways to measure angles. Degrees use 360 units for a full turn, while radians use 2π. Select the mode that matches your problem before using trigonometric functions.
Can I use my computer keyboard?
Yes. Type digits, parentheses, decimal points, and operators. Press Enter to calculate, Backspace to delete the last character, and Escape to clear the current expression. You can also type supported function names such as sqrt( and sin(.
Why do I get an error for some expressions?
Some operations do not have a real-number result. For example, log(0), log(-2), or sqrt(-4) are outside the real-number domain supported by this calculator. Check your expression and parentheses.
Are my calculations sent to a server?
The calculator's expression evaluation runs locally in your browser. This page does not send calculation inputs to a calculation server.
Ready to solve your next problem?
Return to the calculator and enter an expression whenever you need a quick scientific calculation.
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