Number Base Calculator

A high-precision base to base converter. Instantly translate numbers between Binary, Octal, Decimal, and Hexadecimal without rounding errors.

Quick Presets:
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Dec Bin Oct Hex

Reliable Base to Base Conversion

Whether you're debugging a memory address in hexadecimal or analyzing a bitmask in binary, a precise number base calculator is essential. Our tool handles the heavy lifting, allowing you to switch between different numbering systems without the risk of manual calculation errors.

Developer Note: This converter uses BigInt logic internally to avoid precision loss common with standard JavaScript numbers when handling very large binary strings or hexadecimal addresses.

Common Conversion Paths

Binary to Base 10: The most common requirement for computer science students. By summing the powers of two, you can quickly find the decimal equivalent of any binary string.

Decimal to Octal: Frequently used in Unix-like systems for file permissions (e.g., 755 or 644). Our tool makes it instant to see exactly what those octal bits represent in decimal.

Octal to Binary: Since 8 is a power of 2 (2³), each octal digit corresponds exactly to three binary bits, making this one of the fastest manual conversions—and even faster with our tool.