What is 0100 in decimal?
0100₂ converted to decimal is 4₁₀. The place-value working for these exact bits is below — or try other bits in the binary to decimal converter.
Try it yourself — instant converter
See the steps for your number
How to convert 0100 to decimal, step by step
Give each bit its place value — 1, 2, 4, 8 and so on, doubling from the right — then add up the places where the bit is 1.
| Bit | Position | Place value | Bit × place |
|---|---|---|---|
| 0 | 3 | 8 | 0 |
| 1 | 2 | 4 | 4 |
| 0 | 1 | 2 | 0 |
| 0 | 0 | 1 | 0 |
Add the last column: 4 = 4. So 0100₂ = 4₁₀.
In short: 0100₂: 0×8 = 0 → +1×4 = 4 → +0×2 = 4 → +0×1 = 4
Frequently asked questions
How do you convert 0100 to decimal?
Use place values. The only 1 bit sits at place value 4, so the total is 4. So 0100₂ = 4₁₀.
Why does 0100 start with a 0?
The leading 0 adds nothing — its place value contributes 0 — so 0100 has the same value as 100: 4 in decimal. The extra zero just keeps the number at 4 bits wide, the way it is often written in code or in search queries.
Keep converting
← 0011 in decimal · 0101 in decimal →
Popular values
1010 in decimal · 10101 in decimal · 11111 in decimal · 101010 in decimal