Developer·Updated 2026-04-22
Number Base Converter
Decimal, hex, binary, octal. Arbitrary-size integers via BigInt.
Number Base Converter
How it works
- 1.
Enter value
Pick a category: length (m, ft, mi), mass (kg, lb, oz), temperature (°C, °F, K), volume (L, gal), time (s, h, d), or data (KB, MB, GiB).
- 2.
Read results
Pick the source unit from the list. Data sizes support both SI decimal prefixes (KB = 1000 bytes) and IEC binary prefixes (KiB = 1024 bytes).
FAQ
How large can numbers be?+
Arbitrarily large. We use JavaScript BigInt, no float precision loss.
Are prefixes recognized?+
Yes. 0x for hex, 0b for binary, 0o for octal. Underscores and whitespace are stripped.
Are negative values supported?+
Yes. Two's complement is not applied, the minus sign is carried through directly.