What is 11 in binary?
11₁₀ converted to binary is 1011₂. The complete working for this exact number is below — or type a different number into the decimal to binary converter and watch it happen live.
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How to convert 11 to binary, step by step
Keep dividing 11 by 2 and writing down each remainder. The remainders, read in reverse, are the answer.
| Number | ÷ 2 | Quotient | Remainder |
|---|---|---|---|
| 11 | 2 | 5 | 1 |
| 5 | 2 | 2 | 1 |
| 2 | 2 | 1 | 0 |
| 1 | 2 | 0 | 1 |
Reading the remainder column from the bottom up gives 1011, so 11₁₀ = 1011₂. Check it back: 8 + 2 + 1 = 11 — the 1 bits add up to 11.
In short: 11 ÷ 2 = 5 r 1 → 5 ÷ 2 = 2 r 1 → 2 ÷ 2 = 1 r 0 → 1 ÷ 2 = 0 r 1 → read bottom-up: 1011₂
Frequently asked questions
How do you write 11 in binary?
Divide 11 by 2 over and over, noting each remainder: 11 ÷ 2 = 5 r1, 5 ÷ 2 = 2 r1, 2 ÷ 2 = 1 r0, 1 ÷ 2 = 0 r1. Reading the remainders from last to first gives 1011, so 11₁₀ = 1011₂.
How long is 11 in binary?
11 in binary is 1011, which is 4 bits long. It ends in 1 because 11 is odd — the last bit of any binary number tells you odd (1) or even (0).
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