Scientific Calculator

Full keypad with trig, log, exponents and constants. Tap or use your keyboard.

📖 Read the full guide: Scientific Calculator Functions: When to Use Each One In-depth article explaining the math and real-world context. →

Operator Reference

Operator	Meaning	Example
sin, cos, tan	Trig functions (DEG or RAD via toggle)	sin(30) = 0.5 in DEG
sin⁻¹, cos⁻¹, tan⁻¹	Inverse trig	tan⁻¹(1) = 45° in DEG
log	Base-10 logarithm	log(100) = 2
ln	Natural log (base e)	ln(e) = 1
√	Square root	√(25) = 5
^	Exponent	2^10 = 1024
!	Factorial	5! = 120
π	Pi = 3.14159…	Used in trig, area of circle
e	Euler's number = 2.71828…	Base of natural log
%	Percent (divides by 100)	15% = 0.15

Operator Precedence

Follows standard order of operations (PEMDAS / BODMAS):

Parentheses
Exponents (and roots)
Multiplication / Division (left to right)
Addition / Subtraction (left to right)

Use parentheses when in doubt: 2 + 3 × 4 = 14, but (2 + 3) × 4 = 20.

How It Works (Safety)

The calculator evaluates expressions without using JavaScript's eval() directly — it parses input, replaces functions and constants, validates the character set, and then computes via a controlled expression evaluator. This prevents malicious input from running arbitrary code. All computation happens in your browser; nothing is sent to a server.

Common Use Cases

Engineering homework — quick trig, log, and exponent calculations
Financial estimation — compound growth (use ^ for power-of-years)
Statistics — sample standard deviation, factorials for combinations
Physics — kinematic equations, energy calculations
Compound interest in head — FV = P × (1+r)^n quickly