Scientific Calculator

Evaluate complex mathematical expressions with Degrees (DEG) and Radians (RAD) trigonometry, logarithms, roots, exponents, and factorials.

Category: Math

How to Use Scientific Calculator

  1. Type or paste your mathematical expression into the input box (e.g., sin(30) + sqrt(144) * log10(100) + 5!).
  2. Select your preferred Angle Mode—Degrees (DEG) or Radians (RAD)—for trigonometric functions.
  3. Click Calculate to evaluate the expression using our deterministic recursive-descent parser and view standard, scientific, floor, and fractional outputs.

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Frequently Asked Questions

How does the Scientific Calculator follow order of operations (PEMDAS / BODMAS)?

Our recursive-descent mathematical parser evaluates expressions strictly by algebraic precedence: 1) Innermost parentheses (), 2) Functions (sin, cos, log, ln, sqrt) and postfix factorials (!), 3) Right-associative exponentiation (^), 4) Unary signs (+/-), 5) Multiplication (*), division (/), and modulo (%), and 6) Addition (+) and subtraction (-).

What is the difference between Degrees (DEG) and Radians (RAD) mode?

In Degrees (DEG) mode, trigonometric inputs to sin(x), cos(x), and tan(x) are interpreted in degrees (where a full circle is 360° and sin(30) = 0.5), and inverse trig functions (asin, acos, atan) return angles in degrees. In Radians (RAD) mode, angles are measured in radians (where a full circle is 2π and sin(pi/6) = 0.5).

What is the difference between log(x) and ln(x) in this calculator?

In standard scientific calculator notation, log(x) and log10(x) compute the base-10 common logarithm (so log10(100) = 2), whereas ln(x) computes the base-e natural logarithm (where e ≈ 2.718281828, so ln(e) = 1). You can also compute custom bases using log(value, base) or log2(x).

Does the calculator support implicit multiplication like 2pi or 3(4 + 5)?

Yes. The expression tokenizer automatically inserts multiplication when a number, constant, or closing parenthesis is immediately followed by a constant, function, or opening parenthesis—such as 2pi, 3(4 + 5), (2)(3), or 2sin(30).

Why does the calculator use a custom parser instead of JavaScript eval()?

Using eval() or Function() exposes browsers to arbitrary code injection and fails on mathematical syntax like 2^3^2 (right-associative power) or 5! (factorial). EverySolve's deterministic recursive-descent parser executes safely in local memory with exact special-angle trigonometric snapping.