Hexadecimal to Decimal Converter
Convert hexadecimal (base-16) numbers to decimal (base-10) format for memory addresses, color values, configuration settings, and general-purpose numeric conversion
Conversion Options
Common conversions:
0x0 = 0, 0xA = 10, 0x10 = 16
0xFF = 255, 0x100 = 256
0x1000 = 4,096, 0xFFFF = 65,535
0xFFFFFFFF = 4,294,967,295
Supports large numbers via BigInt
Recommended Settings
Pro Tips
- •Hexadecimal uses base-16: digits 0-9 and letters A-F (A=10, B=11, ..., F=15)
- •Each hex digit represents 4 bits, making it compact for binary data
- •Common in programming: 0xFF=255, 0x100=256, 0x1000=4096
- •Supports arbitrarily large numbers using BigInt for precision
Most Popular
Most users enable thousand separators for large numbers to improve readability
When to Use This Tool
Convert hexadecimal memory addresses to decimal offsets for debugging, memory analysis, and pointer arithmetic. Common in system programming, debugging sessions, and crash dump analysis where you need to calculate memory distances or verify address ranges. Example: 0x1000 (4096 bytes) offset from base address.
Convert hexadecimal color codes to decimal RGB values for image processing, color manipulation, and graphics programming. Extract individual color channels from hex codes (#FF8000) to decimal (R=255, G=128, B=0) for calculations, blending operations, and color space conversions in digital art and web design.
Decode hexadecimal configuration values from firmware, BIOS settings, hardware registers, and system configuration files to human-readable decimal numbers. Essential for embedded systems programming, hardware configuration, and understanding technical documentation that uses hex notation for settings.
Convert hex values from log files, network packet captures, binary file analysis, and debugging output to decimal for calculations and comparisons. Useful when analyzing file offsets, data sizes, error codes, and status values where decimal representation is more intuitive for arithmetic operations.
How It Works
Parse input hexadecimal strings (with or without 0x prefix)
Remove 0x prefix if present and removePrefix option is enabled
Remove whitespace and validate hex string (only 0-9, A-F allowed)
Convert hex string to BigInt for arbitrary-precision arithmetic
Use BigInt('0x' + hex) to convert hexadecimal to decimal
Convert BigInt result to decimal string representation
Add thousand separators if enabled using regex pattern
Format output with optional hex input display (0xFF = 255)
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Frequently Asked Questions
Why is hexadecimal used instead of decimal in programming?
Hexadecimal is more compact and aligns perfectly with binary (4 bits per hex digit). Memory addresses, bit patterns, and byte values are easier to represent: 0xFF is clearer than 255 when thinking about 8 bits (11111111). Hex is also more compact: 0xFFFFFFFF vs 4,294,967,295. This makes hex ideal for low-level programming, debugging, and hardware interfaces.
How do I convert hex color codes like #FF8000 to RGB?
Hex color codes use 6 hex digits (3 bytes) for RGB. Split #FF8000 into three pairs: FF (red), 80 (green), 00 (blue). Convert each pair separately: FF → 255, 80 → 128, 00 → 0. So #FF8000 = RGB(255, 128, 0), which is orange. This tool converts each pair individually if you input them separately.
What's the largest hex number this tool can convert?
This tool uses JavaScript's BigInt, which supports arbitrarily large integers limited only by available memory. You can convert hex numbers with hundreds of digits. For example, 0xFFFFFFFFFFFFFFFF (64-bit max) = 18,446,744,073,709,551,615. Even larger values like 256-bit or 512-bit hex numbers are supported without precision loss.
Why do some hex numbers have letters (A-F)?
Hexadecimal is base-16, requiring 16 unique digits. We use 0-9 (values 0-9) plus A-F (values 10-15). A=10, B=11, C=12, D=13, E=14, F=15. This allows representing 0-15 with a single character. For example, 0x2A = (2×16 + 10) = 42 in decimal. The letters can be uppercase or lowercase; both work the same.
How do I calculate the decimal value of a hex number manually?
Multiply each hex digit by 16 raised to its position (right to left, starting at 0), then sum. Example: 0x1A3 = (1×16²) + (10×16¹) + (3×16⁰) = 256 + 160 + 3 = 419. Position 0 (rightmost) is 16⁰=1, position 1 is 16¹=16, position 2 is 16²=256, and so on. Each position is 16 times the previous.
What does the 0x prefix mean in hexadecimal numbers?
The 0x prefix is standard notation in many programming languages (C, C++, JavaScript, Python, etc.) to indicate a hexadecimal literal. It prevents ambiguity: 0x10 is clearly hex (16 in decimal), while 10 could be decimal or hex. Some languages also support other prefixes like \x in strings or $ in assembly, but 0x is most common in modern programming.