Enter a number of bytes and instantly see the equivalent in kilobytes, megabytes, gigabytes, and larger units. Supports both decimal (KB = 1000 bytes) and binary (KiB = 1024 bytes) standards.
Decimal (SI): 1 KB = 1,000 B · 1 MB = 1,000,000 B · used by storage manufacturers
All unit conversions use pure JavaScript arithmetic. No library required. Decimal (SI) conversions divide by powers of 1000; binary (IEC) conversions divide by powers of 1024. Results update instantly as you type.
All calculations happen locally in the page. Our servers are not involved at any point.
For converting between binary, hex, and decimal values, try the number base converter. To convert between length, mass, and other units, use the unit converter. For computing file hashes alongside size checks, see the hash generator.
In decimal (SI) units, 1 KB = 1000 bytes. In binary (IEC) units, 1 KiB = 1024 bytes. The SI definition is used by storage manufacturers and most network contexts; the IEC definition is used by operating systems and RAM.
1 MB (decimal) = 1,000,000 bytes. 1 MiB (binary) = 1,048,576 bytes.
Network speeds are almost always measured in bits (not bytes), using SI prefixes: 1 Mbps = 1,000,000 bits per second. To convert to bytes per second, divide by 8.