How it works
Expressions parse into an evaluation tree respecting PEMDAS; trig and log functions use JavaScript math libraries at floating precision.
How to use Scientific Calculator
- Click keys or type expressions with standard operator precedence.
- Use shift or 2nd for inverse trig and extra functions.
- Apply parentheses for complex numerators and denominators.
- Clear and re-enter if you hit a syntax error.
Worked examples
Concrete numbers and cases you can check against the tool above.
sin(30°) in degree mode
Expect 0.5 exactly; in radian mode sin(30) is sin of 30 radians, not 30 degrees.
When to use Scientific Calculator
Phone calculators hide advanced keys; desktop apps need installs. A tab-based sci-calc keeps expressions private and always available.
Common use cases
- Check algebra and precalc homework steps.
- Compute log or trig values in physics labs.
- Quick engineering estimates at a coworking desk.
Inputs and outputs
- Decimal numbers and standard math operators
- Degrees or radians for trig if toggle exists
Privacy
This tool runs entirely in your browser. Your data never leaves your device — nothing is uploaded to our servers.
Frequently asked questions
- Degree vs radian mode?
- Wrong mode gives wrong trig answers; check the mode indicator before sin/cos/tan.
- How precise are results?
- Floating-point has rounding limits; do not rely on last decimal for critical engineering without error analysis.
- History or memory?
- Some calculators offer M+, MR, or history panels; features vary on the page.