1001 in Binary

What is 1001 in binary? Below we show you the result of the decimal to binary conversion straightaway 🙂

Decimal:

Binary:

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If you want to know how to convert the number please read the instructions on the homepage.

1001₁₀ = 1111101001₂
Decimal 1001 = 1111101001 Binary

Any integer can be written as sum of potencies to the power of 2, known as binary code.

Here’s the proof that 1111101001 is the correct result:

1×2^9 + 1×2^8 + 1×2^7 + 1×2^6 + 1×2^5 + 0x2^4 + 1×2^3 + 0x2^2 + 0x2^1 + 1×2^0 = 1001

Yet, make sure to learn about 1001 in binary signed in the next section.

If you like to know the base-2 numeric system equivalent for any other decimal please use our converter above.

Similar conversions on this web site include:

• 1006 in binary
• 1007 in binary
• 1008 in binary

Convert 1001 to Binary

Now you already know the most important thing:

1111101001₁₀ equals 1001₂ if unsigned.

If 1001 in binary is signed such as with two’s complement, then the binary code has a number of trailing zeroes, e.g. 0001111101001 in which the leftmost bit is the sign bit, followed perhaps by more trailing 0’s, and then by magnitude bits.

The reason to have the binary signed is to accommodate for negative numbers, in which case the sign bit is 1 in our example.

Therefore, minus 1001 signed using two’s complement, will start with one or more 1’s, but the exact code for -1001 decimal depends on the signed number representation system and number of bits available.

Here you can convert binary to decimal.

Additional Information

If you like to know what decimal 1001 is on other number systems, we have that too:

1001 in Hexadecimal = 3E9₁₆
1001 in Octal = 1751₈

Summary

1001 in binary form is 1111101001 usually, that is if not signed.

If you want to know more about signed number representations look it up on Wikipedia for example.

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– Article written by Mark, last updated on December 19th, 2023