A free online scientific calculator with trigonometric, logarithmic, and power functions.
Frequently Asked Questions
How do I switch between degrees and radians?
Use the "Degrees" checkbox above the keypad. When checked, trigonometric functions expect degrees; when unchecked, they expect radians.
What functions does this calculator support?
Basic arithmetic (+, -, x, /), powers (^), square root, sine, cosine, tangent, base-10 logarithm (log), and natural logarithm (ln), plus the constants pi and e.
Is my calculation processed on a server?
No, all calculations run locally in your browser using a safe expression parser — nothing is sent anywhere.
How this scientific calculator works
Behind the scenes, this calculator uses its own safe expression parser (not eval or Function) that respects standard order of operations, supporting addition, subtraction, multiplication, division, powers, parentheses, square roots, trigonometric functions, logarithms, and the constants pi and e.
How to use this scientific calculator
- Tap the number and operator keys to build your expression.
- Toggle Degrees/Radians depending on what your trig functions expect.
- Press „=“ to evaluate.
All calculations run locally in your browser — nothing is sent to a server.
Degrees vs. radians
Trigonometric functions can be evaluated in either degrees (a full circle is 360) or radians (a full circle is 2*pi, roughly 6.283) depending on the context — most everyday and geometry problems use degrees, while calculus and physics typically use radians. Getting this setting wrong is one of the most common sources of „wrong answer“ confusion with any scientific calculator, so always check which mode a problem expects before evaluating.
Common functions explained
- sin, cos, tan: The core trigonometric functions, relating angles to the ratios of sides in a right triangle.
- log and ln: „log“ is base-10 logarithm, commonly used in science and engineering; „ln“ is the natural logarithm (base e), common in calculus and growth/decay problems.
- sqrt and ^ (power): Square root and exponentiation, both frequently needed together in algebra and physics formulas.
- pi and e: The two most common mathematical constants, available directly as buttons rather than needing to be typed out.
Tips for using this calculator
Check the degrees/radians toggle before evaluating any trigonometric expression, since the same input produces a different result in each mode. Parentheses can be nested freely to control the order of operations exactly as you would on paper.
Expert insight: why degrees vs. radians trips up even confident students
Math education resources like Khan Academy consistently flag the degrees/radians distinction as one of the most common sources of confusion with any scientific calculator — the math itself isn’t wrong, the calculator is just set to the mode the problem didn’t intend. Their general study advice applies directly here: explicitly check which unit a problem is using before evaluating any trigonometric expression, rather than assuming your calculator’s default setting matches.
Further reading: Global Math Scores Are Still Recovering — And New PISA Results Drop This September
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Disclaimer: This calculator is provided for general informational and educational purposes only and does not constitute financial, investment, tax, or legal advice. Results are estimates based on the values you enter and should not be relied upon as the sole basis for any financial or other decision. Past performance and projected figures are not a guarantee of future results. Always consult a qualified professional before making financial decisions. See our Legal Notice and Privacy Policy for more information.