Scientific Calculator
Advanced online calculator with trigonometry, logarithms, powers, and mathematical constants.
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How to Use the Scientific Calculator
This free online scientific calculator supports all the functions found on a physical scientific calculator, including trigonometry, logarithms, exponents, factorials, and the constants π and e. No download required — it works in any modern browser on PC, Mac, tablet, or smartphone.
Supported Functions
- Trigonometry: sin, cos, tan (with DEG/RAD toggle)
- Inverse Trig: asin, acos, atan (press INV to toggle)
- Logarithms: log (base-10), ln (natural logarithm)
- Powers & Roots: x², xʸ, √x
- Constants: π (3.14159…), e (2.71828…)
- Other: n! (factorial), |x| (absolute value), % (percent)
DEG vs RAD Mode
Use DEG for everyday angle work (e.g. a right angle is 90°). Use RAD for mathematics and physics (a right angle is π/2 radians). Press the DEG/RAD button at the top to switch modes.
Frequently Asked Questions
Is this scientific calculator free?
Yes, completely free. No installation or account needed — works directly in your browser on any device.
What is the difference between DEG and RAD mode?
DEG (degrees) is used for everyday angle calculations (0°–360°). RAD (radians) is used in higher mathematics and physics (0–2π). Toggle with the DEG/RAD button.
Can I use inverse trig functions (arcsin, arccos, arctan)?
Yes. Press the INV button to switch sin/cos/tan to asin/acos/atan (inverse functions).
How do I enter π or e?
Use the π and e buttons on the calculator. They insert the constants (3.14159… and 2.71828…) into your expression.
What is the factorial (n!) button?
n! calculates the factorial of a non-negative integer. For example, 5! = 5 × 4 × 3 × 2 × 1 = 120.
Can I calculate square root?
Yes. Use the √ button for square root. For example, √144 = 12.