Duodecimal (base 12) to decimal converter
Paste a number in duodecimal (base 12) to get its decimal value, worked out place by place. Handy for exercises and for checking encoded values.
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How to use it
- Enter number in base 12.
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
Value = sum of (digit × 12^position), with position 0 at the far right. Example: 120A = 1×12^3 + 2×12^2 + 0×12^1 + 10×12^0 = 2026.
Example
Inputs: Number in base 12 = 120A. Result: Decimal value: 2026; With thousands separators: 2,026; Decimal digits: 4.
120A
2026
Limits and caveats
- Whole numbers only, up to 1000 digits; a radix point is not accepted here.
- The place value table appears for inputs up to 60 digits.
Questions about this tool
How do I convert duodecimal to decimal by hand?
Multiply each digit by 12 raised to its position, starting at position 0 on the right, then add the results. For example 120A in base 12 equals 2026.
How do I write ten and eleven in duodecimal?
The usual choice is A for ten and B for eleven. This tool also accepts X and E, and the ↊ and ↋ symbols that Unicode added for this purpose.
Which symbols are allowed in base 12?
The digits 0 to 9 and the letters A to B; spaces are ignored. X, E, ↊ and ↋ are also accepted for 10 and 11. Any other symbol triggers a message that names it.