TI-84+ Scientific Calculator is a fully featured, pixel-perfect recreation of the Texas Instruments TI-84+ graphing calculator. It accurately replicates the genuine TI-84+ experience, offering advanced mathematical functions, and complete keyboard support.

Key Highlights

• Authentic TI-84+ Experience: Pixel-perfect button layout, genuine error messages, and correct mathematical precedence
• Complete Keyboard Support: Full keyboard mapping with TI-84+ shortcuts and function keys
• Advanced Mathematics: Trigonometric functions, logarithms, scientific notation, and memory operations
• Unit Conversion: 12-category unit converter with NIST-compliant precision
• Accessibility: Full screen reader support, keyboard navigation, and ARIA compliance

Core Calculator Functions

• Basic arithmetic (+, -, ×, ÷) with proper operator precedence
• Exponentiation (x^y) and square root
• Trigonometric functions (sin, cos, tan) with degree and radian modes
• Inverse trigonometric functions (asin, acos, atan)
• Logarithmic functions (log, ln)
• Factorial calculations
• Scientific notation support (e.g., 1.23E+45)
• Parentheses for grouping complex expressions
• Dedicated (-) key for negative numbers

• Genuine TI-84+ error messages such as ERR:DIVIDE BY 0, ERR:DOMAIN, ERR:OVERFLOW, and ERR:SYNTAX
• Correct mathematical precedence (e.g., -3^2 evaluates to -9, not 9)
• Numerical range of ±1E99 before triggering overflow
• 8-line by 16-character display matching the original TI-84+ specifications
• Mode indicators for DEG/RAD, memory (M), and second-function status
• Persistent calculation history throughout the session

• Standard memory functions: M+, M-, MR, MC
• Single memory slot with a visual indicator when in use
• Memory values retained across calculations
• Keyboard shortcuts: Ctrl+M (store), Ctrl+R (recall), Ctrl+L (clear memory)

• 2nd key activates secondary functions on buttons
• Visual indicator shows when second-function mode is active
• Second-function mode automatically clears after use
• Keyboard support via F2 or Shift+2

Advanced Features

• 12 conversion categories: Length, Area, Volume, Mass, Force, Temperature, Energy, Density, Pressure, Velocity/Speed, Time, and Power
• Conversion factors aligned with NIST SP 811 standards for precision
• Special handling for temperature conversions involving offsets (°C, °F, K, °R)
• Ability to send converted values directly to the main calculator
• Support for scientific notation in conversion results

• Number input via standard digits (0–9) and numpad
• Operator keys: +, -, *, /, ^ (for exponentiation)
• Function keys: s (sin), c (cos), t (tan), l (log), n (ln), r (sqrt), ! (factorial)
• Special keys: Enter or = to calculate, Escape or Delete to clear, Ctrl+A for all clear
• Memory shortcuts: Ctrl+M (store), Ctrl+Shift+M (subtract from memory), Ctrl+R (recall), Ctrl+L (clear memory)
• Mode control: m to toggle between degree and radian, F2 or Shift+2 for second function
• Parentheses keys for expression grouping
• Underscore (_) key for entering negative numbers

• Authentic 8-line by 16-character TI-84+ display
• Right-aligned numeric output, matching the physical calculator
• Persistent calculation history during the session
• On-screen mode indicators for DEG/RAD, memory (M), and 2nd function
• Clearly formatted error messages
• Automatic scientific notation (E format) for very large or small numbers

• Automatic saving of calculator state to localStorage
• Session recovery that restores history, memory content, and mode settings
• Auto-save triggered every 30 seconds
• Graceful error handling for storage failures
• Multiple clear options: CLEAR (current entry), All RAM (history and variables), All Memory (full factory reset)