Bases 2–36 · exact integers
Decimal 31 in bases 2, 8, 10, 16 and 36
Thirty-one is one less than 32, so binary is five ones: 11111₂. It is 37₈, 1F₁₆ and V₃₆.
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 10 to base 2
- Canonical source
- 31
- 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.