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Convert file sizes between Bytes, KB, MB, GB, TB, and PB instantly. Support for both decimal (SI) and binary (IEC) systems. Perfect for developers, IT professionals, and data management!
| Unit | Decimal (SI) | Binary (IEC) | Difference |
|---|---|---|---|
| Kilobyte | 1 KB = 1,000 Bytes | 1 KiB = 1,024 Bytes | 2.4% larger |
| Megabyte | 1 MB = 1,000 KB | 1 MiB = 1,024 KiB | 4.9% larger |
| Gigabyte | 1 GB = 1,000 MB | 1 GiB = 1,024 MiB | 7.4% larger |
| Terabyte | 1 TB = 1,000 GB | 1 TiB = 1,024 GiB | 10% larger |
| Petabyte | 1 PB = 1,000 TB | 1 PiB = 1,024 TiB | 12.6% larger |
Real-time conversion as you type. No need to click convert button, results update automatically.
Accurate calculations with support for decimal places. Perfect for technical work and data analysis.
Convert in both directions with easy swap button. Switch between units instantly.
Support for both Decimal (SI) and Binary (IEC) systems. Choose the standard you need.
See conversions to all units simultaneously. Compare different units at a glance.
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Byte (B): The fundamental unit of digital information. A byte consists of 8 bits and can represent a single character.
Kilobyte (KB/KiB):
Decimal: 1 KB = 1,000 Bytes (10³)
Binary: 1 KiB = 1,024 Bytes (2¹⁰)
Used for: Small text files, simple documents, small images
Megabyte (MB/MiB):
Decimal: 1 MB = 1,000 KB = 1,000,000 Bytes
Binary: 1 MiB = 1,024 KiB = 1,048,576 Bytes
Used for: Photos, MP3 songs, short videos, documents
Gigabyte (GB/GiB):
Decimal: 1 GB = 1,000 MB = 1,000,000,000 Bytes
Binary: 1 GiB = 1,024 MiB = 1,073,741,824 Bytes
Used for: HD movies, large software, mobile apps, games
Terabyte (TB/TiB):
Decimal: 1 TB = 1,000 GB = 1,000,000,000,000 Bytes
Binary: 1 TiB = 1,024 GiB = 1,099,511,627,776 Bytes
Used for: Hard drives, large databases, video libraries
Petabyte (PB/PiB):
Decimal: 1 PB = 1,000 TB
Binary: 1 PiB = 1,024 TiB
Used for: Data centers, cloud storage, enterprise storage systems
Decimal System (SI - International System):
Uses base-10 (powers of 1000). This is the standard used by storage manufacturers, operating system installers, and most consumer electronics. When you buy a "1 TB" hard drive, it contains 1,000,000,000,000 bytes.
Binary System (IEC - International Electrotechnical Commission):
Uses base-2 (powers of 1024). This is how computers actually work internally and how operating systems typically report file sizes. A "1 GiB" file in Windows is actually 1,073,741,824 bytes.
Why Two Systems?
The confusion arises because computers work in binary (base-2), but humans prefer decimal (base-10). Storage manufacturers use decimal because it makes their products appear larger. A "500 GB" hard drive is actually only about 465 GiB when reported by your operating system.
Use Decimal (SI) System When:
Use Binary (IEC) System When:
For Developers:
For IT Professionals:
For Content Creators:
Q: Why does my 1 TB hard drive show only 931 GB?
A: Manufacturers use decimal (1 TB = 1,000 GB), but operating systems use binary (1 TiB = 1,024 GiB). A 1 TB drive is actually 931 GiB.
Q: Which system should I use?
A: Use decimal for storage devices and network speeds. Use binary for file sizes and RAM. Our tool supports both!
Q: How accurate is the converter?
A: Extremely accurate. We use precise calculations with support for decimal places to ensure correct results.
Q: Can I convert negative values?
A: No, file sizes cannot be negative. The converter only accepts positive numbers.
Q: What's the difference between MB and MiB?
A: MB (megabyte) = 1,000,000 bytes (decimal). MiB (mebibyte) = 1,048,576 bytes (binary). MiB is about 4.9% larger.