ZapToolsScientific Calculator
Free online scientific calculator with trigonometry, logarithms, roots and powers. Keyboard supported.
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Tip: type on your keyboard — Enter = equals, Backspace = delete, Esc = clear.
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How to use the scientific calculator
Click the buttons or type directly with your keyboard. Trigonometric functions use radians. Press = or Enter to evaluate the full expression shown on the display.
Supported functions
- Trigonometry: sin, cos, tan and their inverses (asin, acos, atan)
- Logarithms: log (base 10) and ln (natural log)
- Powers & roots: x², x³, xʸ, √ square root
- Constants: π (pi) and e (Euler's number)
- More: factorial (n!), reciprocal (1/x), absolute value, percentage
FAQs
Is this scientific calculator free?
Yes, completely free with no signup and no limits.
Can I use my keyboard?
Yes. Type digits, + - * / ( ) . and press Enter for equals, Backspace to delete, Escape to clear.
Does it work on mobile phones?
Yes, the calculator is fully responsive and touch-friendly.