MB to KB Converter
Convert megabytes to kilobytes — a thousand to the megabyte. Results update as you type; exact factors shown.
One megabyte (10⁶) is 1,000 kilobyte (10³) — see the exact factor, not a rounded rule of thumb.
How the mb to kb converter works
Storage converts through the byte (8 bits). Drive makers and network speeds use decimal prefixes (1 GB = 10⁹ bytes); operating systems often report binary units (1 GiB = 2³⁰ = 1,073,741,824 bytes) — sometimes labelled "GB". The gap is 7.4% at the gigabyte and 10% at the terabyte.
The US uses customary units (US gallon, short ton, °F) in daily life; NIST SP 811 gives the exact SI factors.
Common data conversions
| From | To | Units |
|---|---|---|
| 0.1 MB | 100 kB | megabyte (10⁶) to kilobyte (10³) |
| 0.5 MB | 500 kB | megabyte (10⁶) to kilobyte (10³) |
| 1 MB | 1,000 kB | megabyte (10⁶) to kilobyte (10³) |
| 2 MB | 2,000 kB | megabyte (10⁶) to kilobyte (10³) |
| 5 MB | 5,000 kB | megabyte (10⁶) to kilobyte (10³) |
| 10 MB | 10,000 kB | megabyte (10⁶) to kilobyte (10³) |
| 20 MB | 20,000 kB | megabyte (10⁶) to kilobyte (10³) |
| 50 MB | 50,000 kB | megabyte (10⁶) to kilobyte (10³) |
| 100 MB | 100,000 kB | megabyte (10⁶) to kilobyte (10³) |
| 250 MB | 250,000 kB | megabyte (10⁶) to kilobyte (10³) |
| 500 MB | 500,000 kB | megabyte (10⁶) to kilobyte (10³) |
| 1,000 MB | 1,000,000 kB | megabyte (10⁶) to kilobyte (10³) |
Units in this converter and their exact factors
| Unit | Symbol | One unit in bytes |
|---|---|---|
| bit | bit | 0.125 byte |
| byte | B | 1 byte |
| kilobyte (10³) | kB | 1,000 byte |
| megabyte (10⁶) | MB | 1,000,000 byte |
| gigabyte (10⁹) | GB | 1,000,000,000 byte |
| terabyte (10¹²) | TB | 1,000,000,000,000 byte |
| kibibyte (2¹⁰) | KiB | 1,024 byte |
| mebibyte (2²⁰) | MiB | 1,048,576 byte |
| gibibyte (2³⁰) | GiB | 1,073,741,824 byte |
| tebibyte (2⁴⁰) | TiB | 1,099,511,627,776 byte |
FAQFrequently asked questions about data conversion
How many KB in an MB?
1,000 in decimal units.
What is 0.5 MB in KB?
500 KB.
Why do upload limits use MB?
Because typical files are megabytes; kilobyte limits would need five-digit numbers.
What is a KiB?
1,024 bytes — the binary kilobyte, which is what most operating systems display.
Where these figures come from
- BIPM — The International System of Units (SI Brochure, 9th edition) — definitions of the base and derived units.
- NIST Special Publication 811 — Guide for the Use of the International System of Units — the exact conversion factors used here.
- National Institute of Standards and Technology (NIST) — United States's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.