Online Scientific Calculator

Real physical calculator layout • Natural textbook display • Safe AST math engine

CLASSWIZ

CASIOfx-991EX

Natural-V.P.A.M. · 2nd Edition · 552 Functions

TWO WAY POWER

SAMCMPLXSTATMATVCTEQN
DRGFIXSCIMath▲▼
0

∙∙

REPLAY

∙∙

SETUP∙

∙∙

d/dx:

d/c∙

∛■∙

x³∙

■√■∙

10^■∙

e^■∙

∙A

←B

x!C

sin⁻¹D

cos⁻¹E

tan⁻¹F

RECALLx

←y

,∙

a b/c∙

M-M

CONST∙

CONV∙

RESET∙

INS∙

OFF∙

MATRIX∙

VECTOR∙

STAT∙

nPr∙

nCr∙

∙∙

Pol∙

Rec∙

Rnd∙

Ran#RanInt

πe

PreAns∙

≈∙

⌨ Desktop Keyboard Enabled • 📱 Touch Optimized (≥44px targets) • ⛶ Fullscreen Ready • 🔊 Haptic Audio Synthesizer

Mathematical Capabilities

Precision Engineering & Exact Evaluation

Natural Textbook Display

Expressions appear exactly as they are printed in mathematics textbooks — fractions formatted with stacked numerators and denominators, square roots with radical signs, and exponents styled naturally.

e.g. 1/2 + 3/4 ➔ 5/4 (1.25)

Calculus & Numerical Integration

Calculate numerical derivatives d/dx f(x) at any specified point x using central differences, and definite integrals ∫ f(x) dx with high-precision Simpson's rule quadrature.

e.g. integrate(x^2, 0, 3) ➔ 9

Complex Number Plane (CMPLX)

Full arithmetic in the complex plane a + bi. Seamlessly convert between rectangular coordinates (a, b) and polar form (r∠θ), and compute conjugate, modulus, and complex roots.

e.g. (2 + 3i) × (1 - 2i) ➔ 8 - i

Polynomial & System Solver

Solve quadratic (ax² + bx + c = 0) and cubic polynomials with both real and complex roots, vertex extrema coordinates, and 2×2 or 3×3 simultaneous linear equations via Cramer's rule.

e.g. x² - 5x + 6 = 0 ➔ x₁=3, x₂=2

Matrix & Vector Algebra

Store and compute Matrix A, B, and C operations up to 3×3 and 4×4. Compute determinants, matrix inverses, transpositions, vector dot products, and vector cross products.

e.g. det([[1,2],[3,4]]) ➔ -2

RPN 4-Level Stack Engine

Engineered with genuine Reverse Polish Notation for HP enthusiast workflows. Features a true 4-register stack (X, Y, Z, T), R↓ roll down, X⇋Y register swap, and LAST x recall.

e.g. 3 ENTER 4 + ➔ 7

Hardware Emulation & Layouts

8 Iconic Scientific Calculator Models

Switch between different physical calculator form factors through the discreet utility menu on the calculator toolbar.

PRIMARY DEFAULT

ClassWiz-style fx-991EX

The global flagship scientific calculator with dot-matrix LCD, natural math display, and full engineering toolkit.

High-Res LCD • Solvers • Calculus

ENGINEERING

ES Plus-style fx-115ES

Classic Natural-V.P.A.M. scientific calculator trusted across universities and engineering labs nationwide.

Dual-Line • Replay D-Pad • Fractions

VINTAGE

Classic fx-991MS-style

Retro 2-line S-V.P.A.M. direct expression entry calculator with iconic silver chassis aesthetic.

Two-Line LCD • S-V.P.A.M. • Base-N

MULTIVIEW

TI-30XS-style MultiView

4-line stacked display permitting side-by-side comparison of calculations, stacked fractions, and radical toggle.

4-Line View • Stacked Fractions

RPN STACK

HP 35s-style RPN

Authentic Reverse Polish Notation with 4-level stack (X, Y, Z, T), roll-down, and swap registers.

4-Level RPN Stack • Zero Parens

GRAPHING

TI-84 Plus-style Graphing

2D coordinate function grapher with real-time interactive canvas, trace cursor, and window zoom controls.

2D Plotter • Trace • Window Zoom

COLOR GRAPH

fx-CG50-style Graphing

Dynamic high-res multi-function graphing calculator with V-Window viewport configuration.

V-Window • Dynamic Curves

CAS ADVANCED

TI-Nspire-style CAS

Advanced CAS mathematical environment for symbolic algebra, multi-step calculus, and differential equations.

CAS Algebraic Engine • Calculus

Desktop Productivity

Physical Keyboard Shortcuts

Type directly using your computer keyboard for high-speed scientific workflows.

Numbers: 0-9 Inputs digit

Operations: + - * / + − × ÷ operators

Calculate: Enter or = Evaluates formula

Delete Char: Backspace DEL key

All Clear: Esc or Del AC reset

Exponent: ^ Power x^y

Brackets: ( ) Parentheses nesting

Cursor Nav: ◀ ▶ Move cursor in formula

History Replay: ▲ ▼ Cycle past calculations

Frequently Asked Questions

Everything You Need to Know

What is an online scientific calculator? +

An online scientific calculator is a high-precision mathematical application capable of evaluating complex scientific, statistical, and engineering operations that standard basic calculators cannot handle. This application reproduces the exact physical keyboard hierarchy, LCD display behavior, and mathematical workflows of celebrated handheld scientific calculators like the ClassWiz fx-991EX, fx-115ES, and HP RPN calculators.

How do I use SHIFT on this scientific calculator? +

Press the SHIFT key on the top left of the keypad. The LCD status annunciator at the top of the screen will display the [S] indicator. When active, pressing any calculator key invokes the secondary function printed directly above that key (such as sin⁻¹, ∛x, or x!). SHIFT automatically resets after executing the selected function.

How do I switch between Degrees (DEG) and Radians (RAD)? +

Click the angle mode button (labeled DEG, RAD, or GRAD) in the toolbar directly above the calculator display. The active angle mode is permanently indicated on the LCD status bar: D for degrees, R for radians, and G for gradians.

Can I calculate exact fractions and convert to decimals? +

Yes. Press the fraction button (a/b or n/d) to enter fractional expressions. When calculated, results are displayed in exact reduced fraction form (5/6, 12/7). Press the S⇔D key to instantly toggle between exact fractional representation and standard decimal floating-point format.

How does Fullscreen Mode work? +

Click the Fullscreen button in the calculator toolbar. The browser Fullscreen API expands the calculator to fill the entire monitor or phone display, eliminating website headers and margins for an immersive dedicated physical calculator experience. Press the Exit button or your keyboard's Esc key to return.

Does this calculator use unsafe eval()? +

No. The calculator uses a custom-built, strictly typed Abstract Syntax Tree (AST) parser and recursive descent evaluator written from scratch in pure TypeScript. It safely enforces mathematical operator precedence (PEMDAS / BODMAS), implicit multiplication, exact complex number arithmetic, and numerical calculus without executing arbitrary browser code.