How many KB are in 1 MB?

It depends: decimal SI uses 1 MB = 1000 KB, while binary (MiB) uses 1 MiB = 1024 KiB. Our tool lets you pick either.

How do I convert KB to MB?

Divide the kilobytes by 1000 (decimal) or by 1024 (binary) to get megabytes.

Can I convert MB to KB?

Yes. Multiply MB by 1000 (decimal) or by 1024 (binary) to get KB.

KB to MB Converter | Kilobytes to Megabytes (1000 vs 1024)

Reverse: MB → KB

Megabytes (MB)

Enter MB to get KB

Kilobytes (KB)

KB = MB × divisor

Current mode: Decimal (1 MB = 1000 KB)

Use decimal for marketing / network speeds, and binary for OS/file-system reported sizes.

Quick KB → MB table (decimal)

KB	MB	Notes
500	0.5	Half MB
1000	1	1 MB (decimal)
2048	2.048	2.048 MB (decimal)
1024	1.024	1.024 MB (decimal)
5120	5.12	5 MB approx

Why 1000 vs 1024?

Storage and networking vendors often use decimal prefixes: 1 KB = 1000 bytes, 1 MB = 1000 KB. But operating systems and programmers have historically used powers of two: 1 KiB = 1024 bytes, 1 MiB = 1024 KiB.

Decimal: MB = KB ÷ 1000

Binary: MiB = KiB ÷ 1024

Example (decimal)

4500 KB ÷ 1000 = 4.5 MB

Example (binary)

4500 KiB ÷ 1024 ≈ 4.3945 MiB

FAQ

1. Which should I use for web uploads?

Most web tools label in MB but don’t specify. Using decimal is a safe default.

2. Why does Windows show a different size than the disk label?

Because Windows is reporting binary-based units, while the disk label uses decimal-based marketing units.