Hex to Decimal Converter

How to use

1. Enter Value — Type a hexadecimal or decimal number in either field
2. See Conversions — All bases update in real time as you type
3. Copy Result — Select and copy the converted value you need

What Is Hexadecimal?

Hexadecimal (base-16) is a positional number system that uses sixteen distinct symbols: 0-9 for values zero to nine, and A-F for values ten to fifteen. Each hex digit represents exactly four binary digits (bits), making hexadecimal a convenient shorthand for binary data.

This tool converts between hexadecimal, decimal (base-10), binary (base-2), and octal (base-8) in real time as you type.

Why Hexadecimal Matters in Computing

• Memory addresses: RAM and disk locations are expressed in hex (e.g., 0x7FFF5694)
• Color codes: Web colors use hex notation (#FF5733 = RGB 255, 87, 51)
• Byte values: Each byte (8 bits) maps to exactly two hex digits (00 to FF)
• MAC addresses: Network hardware IDs are formatted in hex (e.g., 00:1A:2B:3C:4D:5E)
• Unicode: Character codes are specified in hex (U+0041 = "A")
• Assembly language: Machine code instructions are represented in hex

Conversion Between Number Bases

This tool simultaneously shows four representations of the same value:

• Hexadecimal (base-16): Uses 0-9 and A-F. Compact representation of binary data
• Decimal (base-10): The familiar everyday number system
• Binary (base-2): The native language of computers — only 0s and 1s
• Octal (base-8): Uses 0-7, historically used in Unix file permissions

Hex to Decimal Conversion Method

To convert hex to decimal manually, multiply each digit by its positional power of 16 (starting from 0 on the right) and sum the results. For hex "1A3": (1 × 16²) + (10 × 16¹) + (3 × 16⁰) = 256 + 160 + 3 = 419.

Large Number Support

This tool uses JavaScript's BigInt type, supporting numbers of arbitrary size without precision loss. You can convert hex values representing 256-bit hashes, large memory addresses, or cryptographic keys without overflow.

Privacy

All conversions happen in your browser. No data is sent to any server.

Convert binary numbers with our Binary to Decimal Converter. Convert between measurement units with our Unit Converter.

Frequently asked questions

What is hexadecimal?

Hexadecimal (base-16) uses digits 0-9 and letters A-F. Each hex digit represents 4 bits, making it a compact way to express binary data. It's widely used in computing for memory addresses, colors, and byte values.

How do I convert hex to decimal?

Each hex digit is multiplied by its positional power of 16. For example, hex 2F = (2 × 16¹) + (15 × 16⁰) = 32 + 15 = 47 in decimal.

Does it handle large numbers?

Yes. This tool uses BigInt for arbitrary precision, supporting hex values of any length without overflow errors.

Can I enter hex with a 0x prefix?

Yes. The tool automatically strips the 0x or 0X prefix if present.

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