Quick Answer: Bytes to Bits
One byte equals 8 bits (1 B = 8 b).
Conversely, 1 b = 0.125 B.
Formula: b = B × 8
Worked examples
- 1 B = 8 b
- 2 B = 16 b
- 4 B = 32 b
Method and limitations
To convert bytes to bits, multiply by 8. Calculations use full-precision constants; answers in this box are rounded for readability (≈ marks a rounded value) and the calculator shows up to 9 significant figures.
Each factor is exact by definition, derived from exact definitions, or a documented conventional value — see the methodology and sources.
Conversion Formula
To convert bytes to bits, multiply by 8.
Complete Guide to Bytes to Bits Conversion
What is a byte?
Bytes measure file sizes and storage, representing 8 bits of data.
What is a bit?
Bits are the fundamental unit for measuring data transmission speeds and binary data.
How the Conversion Works
Multiply bytes by 8 to get bits. This is essential for calculating transfer times and bandwidth requirements.
Why This Conversion Matters
This conversion bridges the gap between file sizes (bytes) and network speeds (bits per second).
Step-by-Step Conversion Guide
Follow these steps to convert bytes to bits manually:
Start with your value in bytes
Example: You want to convert 4 B
Apply the conversion formula
Use the formula: b = B × 8
Calculate the result
4 B = 32 b
Verify your answer
Use our calculator above to double-check your manual calculation.
Quick Mental Math Tip
To convert bytes to bits, multiply by 8.
Common Conversions
| Bytes (B) | Bits (b) | Bits → Bytes |
|---|---|---|
| 1 B | 8 | 1 b = 0.125 B |
| 2 B | 16 | 2 b = 0.25 B |
| 4 B | 32 | 4 b = 0.5 B |
| 8 B | 64 | 8 b = 1 B |
| 16 B | 128 | 16 b = 2 B |
| 32 B | 256 | 32 b = 4 B |
| 64 B | 512 | 64 b = 8 B |
| 128 B | 1,024 | 128 b = 16 B |
| 256 B | 2,048 | 256 b = 32 B |
| 1024 B | 8,192 | 1024 b = 128 B |
Did You Know?
Data storage units follow a binary system (1024) in computing but a decimal system (1000) in marketing — this is why your "500 GB" drive shows less space.
Popular Bytes to Bits Conversions
Tap any value to load it into the calculator above.
When You'll Need This Conversion
Bandwidth Calculations
Convert file sizes in bytes to bits for calculating transfer times at bit-based speeds.
Binary Representation
Understand how many binary digits are needed to represent data quantities.
Serial Communication
Calculate transmission times for byte-sized data over bit-rate serial connections.
Pro Tips for Accurate Conversions
File transfer time
To calculate download time: convert file bytes to bits, then divide by your internet speed in bps.
Memory addressing
Memory is addressed in bytes, but data buses are measured in bits (32-bit, 64-bit systems).
Common Mistakes to Avoid
Forgetting to multiply by 8 for transfer calculations
A 1 MB file is 8 Mb, not 1 Mb. Transfer time is 8× longer than you might expect.
Always multiply bytes by 8 when comparing to bit-based speeds.
History & Background
Converting bytes to bits is essential when working with network speeds, which are measured in bits per second for historical reasons.
Frequently Asked Questions
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Conversion factors on this page are either exact by definition, derived from exact definitions, or conventional values in documented use. Each is listed with its source in our conversion methodology and sources, which cites the BIPM SI Brochure, NIST Special Publication 811 and the relevant IEC or national standards. Results are rounded for display only; calculations use full precision.