How many bytes is 1 MB?

In SI decimal: 1,000,000 bytes. In binary (mebibyte): 1,048,576 bytes.

How many bytes is a 10 MB file?

10 × 1,000,000 = 10,000,000 bytes (SI decimal).

Why does a 1 MB file show as 1,048,576 bytes in some operating systems?

Older operating systems used binary prefixes where 1 MB = 2²⁰ = 1,048,576 bytes. Modern storage uses SI decimal (1 MB = 1,000,000 bytes).

Megabytes to Bytes Converter

Convert megabytes to bytes for programming, network protocols, and low-level storage calculations. Software and system developers frequently need to work at byte level when processing file sizes in megabytes.

Formula

Multiply megabytes by 1,000,000 to get bytes (decimal SI). To reverse, divide bytes by 1,000,000 to get megabytes.

Quick reference

Megabyte (MB)	Byte (B)
0.1	100,000
0.5	500,000
1	1,000,000
2	2,000,000
5	5,000,000
10	10,000,000
25	25,000,000
50	50,000,000
100	100,000,000
500	500,000,000

About these units

Megabyte

The megabyte (10⁶ bytes in SI, 2²⁰ = 1,048,576 bytes in binary) became the standard file size unit in the personal computing era. The SI definition is used by storage manufacturers and network providers.

Byte

The byte (8 bits) is the fundamental addressable unit of computer memory. All file sizes, memory capacities, and transfer volumes are ultimately counted in bytes.

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