Base 8 to base 10

Convert Octal to Decimal

Convert base 8 values to base 10. Integers remain exact even when they exceed JavaScript's ordinary safe-number limit.

Number From base

Result

42

To base

52₈ = 42₁₀

Same value in common bases

Base	Value

Method

How to convert base 8 to base 10

Each octal digit is evaluated by its power of 8. The exact value is then repeatedly divided by 10 to produce the destination digits.

value₁₀ = sum(digit x 8^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

Octal to Decimal table

Octal (base 8)	Decimal (base 10)
1	1
2	2
12	10
52	42
144	100
377	255
2000	1024

Continue converting

Decimal to OctalReverse conversion Binary to decimalBase 2 to base 10 Decimal to hexadecimalBase 10 to base 16