โ Math
Octal to Decimal Converter
Octal is base eight and remains in use for Unix file permissions, where each digit represents the read, write and execute bits for one of three permission groups.
How it works
Octal number
Decimal
Binary
Hexadecimal
Octal digits
Frequently asked questions
How do I use the Octal to Decimal Converter?
Fill in the fields above โ the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.