Base 10 to base 21

Convert Decimal to Base 21

Convert base 10 values to base 21. Integers remain exact even when they exceed JavaScript's ordinary safe-number limit.

Number From base

Result

20

To base

42₁₀ = 20₂₁

Same value in common bases

Base	Value

Method

How to convert base 10 to base 21

Each decimal digit is evaluated by its power of 10. The exact value is then repeatedly divided by 21 to produce the destination digits.

value₁₀ = sum(digit x 10^position)

For fractional digits, the converter keeps an exact rational numerator and denominator, then generates up to 32 destination digits. An ellipsis marks a repeating or longer expansion.

Examples

Decimal to Base 21 table

Decimal (base 10)	Base 21 (base 21)
1	1
2	2
10	A
42	20
100	4G
255	C3
1024	26G

Continue converting

Base 21 to DecimalReverse conversion Binary to decimalBase 2 to base 10 Decimal to hexadecimalBase 10 to base 16