Bit to Byte Converter
Quickly convert from Bit to Byte.
How to convert
Formula:
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It measures the amount of information that can be stored on a digital medium. The base unit is the Byte.
Where is it used?
In mobile phones (GB), in hard drives (TB), and in internet speed.
Examples:
• A high-resolution photo is about 3-5 MB.
• 1 Terabyte holds about 250,000 songs.
• A DVD holds 4.7 GB of data.
In an era of cloud storage, streaming, and ever-growing data, understanding digital storage units is more important than ever. Whether you're comparing phone storage, calculating download times, or managing server capacity, knowing the difference between MB and MiB — or GB and TB — saves confusion and money.
Digital storage measures the capacity to store information electronically. The fundamental unit is the bit (0 or 1), and 8 bits make a byte. There are two competing systems of prefixes: decimal (SI: kilo = 1,000) used by storage manufacturers, and binary (IEC: kibi = 1,024) used by operating systems. This discrepancy is the source of enormous confusion.
Where is it used?
- Consumer devices — Phone/laptop storage in GB or TB (decimal, as marketed).
- Operating systems — Windows shows file sizes in binary units but labels them GB, causing apparent "missing" space.
- Internet & Networking — Download speeds in Mbps (megabits), file sizes in MB (megabytes) — 8× difference.
- Cloud & Servers — Server RAM in GiB (binary); SSD/HDD in GB (decimal).
- Media & Streaming — Video bitrates in Mbps; file sizes in GB. A 4K movie can be 50-100 GB.
Common Conversion Mistakes
Confusing megabits (Mb) with megabytes (MB)
Internet speeds are advertised in megabits per second (Mbps), but file sizes are in megabytes (MB). 1 byte = 8 bits. So a 100 Mbps connection downloads at about 12.5 MB/s, not 100 MB/s.
Wondering where your storage "went"
A 1 TB hard drive shows ~931 GB in Windows. The drive actually has 1,000,000,000,000 bytes (1 TB decimal), but Windows counts in binary (1 TiB = 1,099,511,627,776 bytes). Nothing is missing — it's a labeling mismatch.
Treating KB, MB, GB as exact powers of 1,000
In the SI (decimal) system, 1 KB = 1,000 bytes. In the binary system (used by most OS), 1 KiB = 1,024 bytes. The difference grows at larger scales: 1 TB vs 1 TiB differs by about 10%.
Ignoring overhead in storage calculations
File systems, formatting, and metadata consume space. A freshly formatted 1 TB drive may show only 920-930 GB usable, due to both the decimal/binary mismatch and file system overhead.
Quick Reference Table
| From | To |
|---|---|
| 1 Byte | 8 bits |
| 1 KB (kilobyte) | 1,000 bytes |
| 1 KiB (kibibyte) | 1,024 bytes |
| 1 MB (megabyte) | 1,000,000 bytes |
| 1 MiB (mebibyte) | 1,048,576 bytes |
| 1 GB (gigabyte) | 1,000,000,000 bytes |
| 1 GiB (gibibyte) | 1,073,741,824 bytes |
| 1 TB (terabyte) | 1,000 GB / 931 GiB |
Frequently Asked Questions
Why does my 1 TB drive only show 931 GB?
Storage manufacturers use decimal (SI) units: 1 TB = 1,000,000,000,000 bytes. But Windows measures in binary: 1 TiB = 1,099,511,627,776 bytes. When Windows divides 1 trillion bytes by 1,073,741,824 (its definition of 1 GB), you get ~931 GB. The storage is all there — it's a labeling difference, not missing space.
What is the difference between MB and MiB?
MB (megabyte, SI) = exactly 1,000,000 bytes. MiB (mebibyte, IEC) = exactly 1,048,576 bytes (2²⁰). The IEC binary prefixes (KiB, MiB, GiB, TiB) were introduced in 1998 to eliminate ambiguity, but adoption has been slow. Most operating systems use binary values but label them with SI prefixes.
Why are internet speeds in megabits instead of megabytes?
Historically, telecommunications measured data rates in bits because serial communication transmits one bit at a time. ISPs continue using megabits (Mbps) partly by convention and partly because the larger numbers look better in advertising. To get your download speed in megabytes per second, divide by 8.
How much storage does a typical photo or video use?
A smartphone photo (12 MP, JPEG) is typically 3-5 MB. A RAW photo can be 25-50 MB. A minute of 1080p video uses about 130 MB, while a minute of 4K video uses about 375 MB. A full-length 4K movie can range from 50 to 100 GB.
What comes after terabyte?
The progression is: Kilobyte (KB, 10³) → Megabyte (MB, 10⁶) → Gigabyte (GB, 10⁹) → Terabyte (TB, 10¹²) → Petabyte (PB, 10¹⁵) → Exabyte (EB, 10¹⁸) → Zettabyte (ZB, 10²¹) → Yottabyte (YB, 10²⁴). As of 2025, global data creation is estimated at around 180 zettabytes per year.
Sources & Standards
- International Electrotechnical Commission (IEC) — IEC 80000-13:2008
- National Institute of Standards and Technology (NIST)
- IEEE Standards Association
Reviewed by The Unit Hub Editorial Team · March 2026