MB to KB Converter

Convert megabytes to kilobytes instantly. Free MB to KB converter with binary (1024) and decimal (1000) standards, reference table, and file size examples.

1 KB = 1,024 bytes — used by OS, RAM, file sizes

1 MB =

1,024KB

Standard: Binary (1 KB = 1,024 B)

All Units

1 MB in every unit (binary)

Binary vs Decimal

Why your hard drive shows less space

1024
Binary (OS Reports)
1,048,576 bytes
1000
Decimal (Manufacturer)
1,000,000 bytes

Difference: 4.6% — this is why a "1 TB" drive shows ~931 GB in your OS

Transfer Time

Estimated time to transfer 1 MB

4G LTE (50 Mbps)160 ms
5G (500 Mbps)16 ms
Wi-Fi 5 (400 Mbps)20 ms
Wi-Fi 6 (1 Gbps)8 ms
100 Mbps Broadband80 ms
Gigabit Ethernet8 ms
USB 2.0 (480 Mbps)17 ms
USB 3.0 (5 Gbps)2 ms

How to Convert Megabyte to Kilobyte

Formula with a worked example (binary (1024))

To convert megabyte (MB) to kilobyte (KB), use this formula:

KB = MB × 1,024 (binary) or MB × 1,000 (decimal)

Example: Convert 5 MB to KB (binary (1024))

5 MB = 5,120 KB

To convert back, use: MB = KB ÷ 1,024 (binary) or KB ÷ 1,000 (decimal)

Megabyte to Kilobyte Conversion Table

Quick reference (binary (1024))

MBKB
0.001 MB1.024 KB
0.01 MB10.24 KB
0.1 MB102.4 KB
0.5 MB512 KB
1 MB1,024 KB
2 MB2,048 KB
5 MB5,120 KB
10 MB10,240 KB
50 MB51,200 KB
100 MB102,400 KB

Binary vs Decimal: Which Standard?

Why 1 MB can have two different values in KB

There are two ways to define how many kilobyte are in a megabyte:

Binary (1024-based)

1 MB = 1,024 KB

Used by: OS, RAM, file sizes

Decimal (1000-based)

1 MB = 1,000 KB

Used by: HDD/SSD manufacturers, networks

Fun fact: A standard 3.5" floppy disk held 1,440 KB (1.44 MB) — about the size of a single smartphone photo today.

When Do You Need MB to KB?

Common scenarios where this conversion comes in handy

1

file size estimation

2

email attachment limits

3

app storage planning

4

bandwidth calculations

Frequently Asked Questions

Common questions about converting megabyte to kilobyte

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Last updated Mar 24, 2026