Bases 2–36 · exact integers
Convert hexadecimal to decimal exactly
Use digits 0–9 and letters A–F in either case, validate the entire value, and calculate the exact signed decimal integer.
Live conversion
Integer base converter
Up to 4096 ASCII characters; optional leading minus sign.
Enter a whole base from 2 through 36.
Quick base pairs
Switch the source and target while preserving the current valid integer.
Integer notation only: no fractions, exponents, 0x/0b prefixes, separators, whitespace, text encoding, IEEE-754 interpretation, or symbolic expressions.
Exact result
Base 16 to base 10
- Canonical source
- FF
- Source digits
- 2
The same integer in common bases
Value catalog
Common decimal values across five bases
Open a finite, indexable reference page for each curated decimal anchor. Calculator state itself never enters the URL.