81 in Octal

Decimal 81 in octal conversion provides the detailed information on what is the octal equivalent of (81)10, and the step-by-step work for how to convert the decimal (base-10) number 81 to its octal (base-8) equivalent.

(81)10 in octal is equal to:
(81)10 = (?)8

Perform successive MOD-8 operation for decimal 81, and mark the initial remainder as LSB and the final remainder as MSB as like the below.

MOD-8 of 81	81 / 8 = 10	Remainder is 1 → LSB
MOD-8 of 10	10 / 8 = 1	Remainder is 2
MOD-8 of 1	1 / 8 = 0	Remainder is 1 → MSB

Arrange the remainders from MSB to LSB forms the octal equivalent of 81.
81₁₀ = 121₈

Hence,
81 in octal is 121

where,
81₁₀ is the given decimal number,
10 in 81₁₀ represents the base-10 or decimal number system,
121₈ is the octal equivalent of the decimal 81,
8 in 121₈ represents the base-8 or octal number system.

Important Notes: (81)10 in Octal
The below are some of the important notes to be remembered while converting the (base-10) decimal number 81 into a (base-8) octal equivalent.

1. The first remainder of MOD-8 of 81 is a Least Significant Bit (LSB).
2. The final remainder of MOD-8 of 81 is a Most Significant Bit (MSB).
3. The remainders of MOD-8 of 81 should be written from MSB to LSB to form the octal equivalent for the given decimal number (81)10.