Hex to Decimal Converter

Effortless, accurate conversions for programmers, students, and digital professionals. Instantly convert hexadecimal to decimal (and back) online—no signup, no confusion.
A closeup of a programmer at a computer working with hexadecimal and decimal values, with code and digital numbers visible

Hexadecimal (base 16) and decimal (base 10) are two of the most important number systems in programming, electronics, and digital technology. Hex is used everywhere: from RGB color codes and memory addresses to microcontroller programming and network protocols. Instantly converting between hex and decimal helps you debug, read low-level data, and work efficiently—whether you’re a developer, student, or engineer.

Instant Hex to Decimal Converter Tool

Enter a hexadecimal (0–9, A–F) or decimal (0–9) value below. The conversion is automatic—works both ways! Use the copy buttons for easy sharing.
Examples: Hex – 1A3F, ff, 0xC0FFEE  |  Decimal – 6703, 255, 12648430

Quick-Reference Table: Hex, Decimal & Binary (0–15)

See how each hex digit maps to decimal and binary.
HexDecimalBinary
000000
110001
220010
330011
440100
550101
660110
770111
881000
991001
A101010
B111011
C121100
D131101
E141110
F151111

Where Hex-Decimal Conversion Matters

  • Debugging low-level code: Interpreting memory dumps, machine instructions, or error codes.
  • Color representation: CSS and graphics tools use hex color codes (e.g., #FF5733), which are often easier to manipulate in decimal for calculations.
  • Networking: IP addresses, MAC addresses, and protocol fields often use hex for compactness.
  • Embedded systems: Microcontrollers and hardware registers are documented in hex, but calculations often require decimal.
  • Education: Understanding number systems is fundamental for CS students and electronics learners.

Beyond the Basics

Want to go further? Try our Hex to Binary Converter or Hex to RGB Converter for color codes.

Tips & Common Pitfalls

  • Hex is not case sensitive: 1A3F = 1a3f
  • Ignore 0x prefix when converting—it's just notation.
  • Only use 0–9 and A–F (or a–f) for hex digits.
  • Double-check for typos—one wrong digit changes the value completely.
  • Use copy buttons to avoid manual errors.
Always check your tool or code for input validation—invalid characters cause unexpected results!

Hex to Decimal Conversion FAQ

Decimal is the base-10 number system we use every day—digits 0 to 9. Hexadecimal is base-16, using 0–9 plus A–F to represent values 10–15. Hex allows for more compact representation of large binary values, making it popular in programming, electronics, and digital systems.

Each digit in a hex number represents a power of 16. For example, 1A3F is 1×16^3 + 10×16^2 + 3×16^1 + 15×16^0. For long numbers, use an online converter like this tool for instant, error-free calculation.

Hexadecimal is more compact than binary and maps directly to 4-bit binary units (nibbles), making it easier to read, debug, and describe memory addresses, color codes, and protocol data. It’s a convenient shorthand that balances readability and precision.

Yes—hexadecimal is case-insensitive. Both 1a3f and 1A3F are valid and mean the same thing. Most programming languages and tools accept either lowercase or uppercase letters for A–F.

The 0x prefix is a common notation in programming to indicate a value is in hexadecimal. For example, 0xFF means 255 in decimal. You can omit 0x when converting; this tool ignores it automatically.

The most common mistakes are: entering invalid characters (anything beyond 0–9, A–F); forgetting to remove 0x; mixing up digit order; and exceeding the supported range for your tool or programming language. Always double-check your input and use a reliable converter for accuracy.

Yes! You can convert each pair of hex digits in a color code (e.g., #FF5733 – red: FF, green: 57, blue: 33) to decimal to understand their RGB values. For more, try our Hex to RGB Converter.