How many bytes are in a megabyte?

Using the binary system (which this tool uses), 1 MB equals 1,048,576 bytes (1024 x 1024). The decimal system defines 1 MB as 1,000,000 bytes.

Does this use binary (1024) or decimal (1000) conversion?

This tool uses the binary (base-1024) system, which is the standard used by operating systems to report file sizes.

Yes, the tool handles values from fractions of a byte up to many terabytes, displaying results in scientific notation when needed.

No. All conversions happen entirely in your browser. No data leaves your device.

Enter a value and select a unit to see conversions to all other file-size units.

Value

Unit

Bytes

Step 1

Enter a numeric file size in the input field.

Step 2

Select the source unit (Bytes, KB, MB, GB, or TB).

Step 3

View all conversions instantly in the grid below.

Step 4

Copy any value you need for your project or documentation.

Real-time conversion across five common file-size units.

Uses the binary (base-1024) system matching OS-reported sizes.

Handles very large and very small values with automatic formatting.

Works entirely in your browser — no data sent to a server.

Completely free with no limits or sign-up.

: Using the binary system (which this tool uses), 1 MB equals 1,048,576 bytes (1024 x 1024). The decimal system defines 1 MB as 1,000,000 bytes.
: This tool uses the binary (base-1024) system, which is the standard used by operating systems to report file sizes.
: Yes, the tool handles values from fractions of a byte up to many terabytes, displaying results in scientific notation when needed.
: No. All conversions happen entirely in your browser. No data leaves your device.