Octal to Decimal Conversion
Convert between Octal and Decimal quickly and accurately.
How to Convert Octal to Decimal
Conversion Formula
Example
Convert 15 oct to dec:
Unit Information
Learn about the numbers units you're converting between
Octal
oct
Definition
Octal is a base-8 numeral system using digits 0, 1, 2, 3, 4, 5, 6, and 7. It was historically important in early computer systems and is still used in some programming contexts.
History/Origin
Octal was widely used in early computer systems, particularly in the 1960s and 1970s. It was popular because it maps easily to binary (3 bits per octal digit).
Current Use
Octal is used in some programming languages, file permissions (Unix/Linux), and certain computer science applications.
Multiplier
8
Offset
0
Decimal
dec
Definition
Decimal is a base-10 numeral system using digits 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9. It is the most widely used numeral system in the world, forming the foundation of modern mathematics.
History/Origin
Decimal systems have been used for thousands of years, likely originating from counting on ten fingers. The Hindu-Arabic numeral system standardized decimal notation.
Current Use
Decimal is used in all aspects of daily life, mathematics, science, engineering, finance, and virtually every field that involves numbers.
Multiplier
10
Offset
0
Octal to Decimal Conversion Table
| Octal [oct] | Decimal [dec] |
|---|---|
| 1 oct | 0.8 dec |
| 10 oct | 8 dec |
| 25 oct | 20 dec |
| 50 oct | 40 dec |
| 100 oct | 80 dec |
| 0 oct | 0E+0 dec |
| -10 oct | -8 dec |
| -40 oct | -32 dec |
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