File size converter
Convert instantly between bytes, KB, MB, GB and TB — free on 727ave.com
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Transfer time estimator
Binary standard (1024) is used by operating systems. Decimal standard (1000) is used by hard drive and SSD manufacturers — which is why your 1 TB drive shows less space in Windows or macOS.
File size reference guide
Common file sizes
Plain text document~10 KB
Word document (10 pages)~50–200 KB
JPEG photo (smartphone)~2–5 MB
RAW photo (DSLR)~20–45 MB
MP3 song (4 min)~4–8 MB
HD video (1 min, 1080p)~150–400 MB
4K video (1 min)~350 MB – 1 GB
Standard DVD~4.7 GB
Blu-ray movie~25–50 GB
Windows 11 install~20 GB
macOS Sequoia~13 GB
Large PC game~50–150 GB
Quick conversion table
1 KB1,024 bytes
1 MB1,024 KB = 1,048,576 bytes
1 GB1,024 MB = 1,073,741,824 bytes
1 TB1,024 GB = 1,099,511,627,776 bytes
1 PB1,024 TB
Why does my drive show less space?
Drive manufacturers use decimal (1 KB = 1,000 bytes). Your operating system uses binary (1 KB = 1,024 bytes). A "1 TB" drive actually holds 1,000,000,000,000 bytes — which your OS reports as about 931 GB.