Scientific Calculator Guide: Order of Operations & Functions

A scientific calculator does more than add and multiply — it evaluates expressions containing parentheses, exponents, trigonometric and logarithmic functions, and scientific notation. Understanding how it interprets your input is the key to getting correct answers.

The Order of Operations (PEMDAS)

Example: 2 + 3 × 4² is evaluated as 2 + (3 × (4²)) = 2 + (3 × 16) = 2 + 48 = 50, not 50 (from (2+3)×4²=80). When in doubt, use parentheses to make the order explicit.

Trigonometric & Logarithmic Functions

• Trig — sin, cos, tan (and their inverses asin, acos, atan). Toggle between degrees and radians.
• Logarithms — log (base 10) and ln (natural log, base e).
• Powers & roots — x², x³, xʸ, √, ʸ√x.
• Constants — π (3.14159…) and e (2.71828…).

Scientific Notation

For very large or very small numbers, use the E or EE key: 6.022E23 means 6.022 × 10²³ (Avogadro's number). The calculator handles the exponent arithmetic automatically.

Memory Keys

M+ adds the current value to memory, M− subtracts, MR recalls, and MC clears. Useful for storing intermediate results in multi-step problems.

Put It Into Practice

Type any expression — with parentheses, functions, and constants — and see the result instantly. Switch between degrees and radians with one tap.