Scientific Calculator

How to Use Scientific Calculator

The Scientific Calculator works just like a physical scientific calculator, but runs entirely in your browser. Here is how to use it effectively:

1. Select angle mode — Choose DEG (degrees) or RAD (radians) depending on your calculation. The Scientific Calculator defaults to DEG mode.
2. Build your expression — Click the digit and operator buttons to build the expression shown in the display area.
3. Use function keys — Press sin, cos, tan, ln, log, or √ before entering a number to wrap it in the corresponding function. Use ( ) for explicit grouping.
4. Use constants — Click π or e to insert those constants directly.
5. Press = to evaluate — The Scientific Calculator computes the full expression and shows the result.
6. Clear the display — Press C to clear the current expression. Press ⌫ to delete the last character.
7. Review history — Each result is logged in the history panel below. Scroll to review past calculations.

Formula & Theory — Scientific Calculator

The Scientific Calculator evaluates mathematical expressions using a multi-pass token replacement strategy:

Expression parsing:

All named functions and constants are replaced with their JavaScript equivalents before evaluation:

sin  → Math.sin    (applies DEG→RAD conversion if DEG mode)
cos  → Math.cos    (same)
tan  → Math.tan    (same)
asin → Math.asin   (result in degrees if DEG mode)
acos → Math.acos
atan → Math.atan
ln   → Math.log
log  → Math.log10
√    → Math.sqrt
π    → Math.PI
e    → Math.E
n!   → factorial(n)
xⁿ  → Math.pow(x, n)

DEG/RAD conversion:

In DEG mode: sin(θ°) = Math.sin(θ × π / 180)
In RAD mode: sin(θ) = Math.sin(θ)

The expression is then evaluated safely by the browser's JavaScript engine. The Scientific Calculator rounds results to 10 significant figures to avoid floating-point noise.

Use Cases for Scientific Calculator

The Scientific Calculator covers a broad range of academic and professional needs:

• Students — Evaluate trigonometric expressions for geometry, physics, and engineering coursework without a physical calculator.
• Engineers — Quickly compute expressions involving logarithms, powers, and trig functions during design work or unit conversions.
• Scientists — Evaluate natural logarithm and exponential expressions common in decay equations, statistics, and thermodynamics.
• Finance — Compute compound interest, present values, and IRR approximations with power and log functions.
• Teachers — Use the Scientific Calculator as a screen-share demonstration tool when explaining order of operations and function behavior.

Accessible from any browser with no installation required, the Scientific Calculator is a versatile tool for any situation that requires more than a basic four-function calculator.