Use this mb to kb converter to move between megabytes, kilobytes, bytes, GB and TB without doing the maths yourself. Type a number into the box above and it shows both the decimal answer, where 1 MB equals 1,000 KB, and the binary answer, where 1 MB equals 1,024 KB, since different tools and operating systems use different rules.
How to use this mb to kb converter
- Enter the number of megabytes into the box above.
- The box above shows the result both ways at once: 1,000 KB per MB (decimal) and 1,024 KB per MB (binary), so you don’t have to pick a mode first.
- Switch the units in the box above if you need kb to mb, gb to mb, or a value in bytes or TB instead.
When you need to convert mb to kb
- Checking whether a photo, PDF or attachment will fit under an email or form limit set in KB.
- Comparing a file size shown in kilobytes on one website against a size shown in megabytes on another.
- Reading old software, camera or SD card specs that still list sizes in KB.
More than one conversion
This is a full file size converter, not a single fixed conversion. Besides megabytes to kilobytes, it handles kb to mb and gb to mb, and covers bytes and TB as well. Every result appears in both decimal and binary form side by side, so you can match whichever standard the other tool, phone or file manager is using.
Decimal or binary: which one is right
Storage makers usually use decimal units, where 1 MB is 1,000 KB — that’s why a “128 GB” phone always shows less free space than expected. Windows and macOS often use binary units instead, where 1 MB is 1,024 KB. Neither number is wrong; use decimal for spec sheets and binary for file properties windows.
Questions people ask
How does this mb to kb converter calculate the result?
It applies both rules at once: 1 MB as 1,000 KB (decimal) and 1,024 KB (binary), so you get both figures without choosing in advance.
How many KB are in 1 MB?
1,000 KB in the decimal system, or 1,024 KB in the binary system. Which one applies depends on where you got the original number from.
How do I convert kb to mb?
Enter the kilobyte figure into the box above and switch the direction; it divides by 1,000 or 1,024 for you, matching the same decimal or binary choice.
How do I convert gb to mb?
Use the box above and pick GB and MB as the units; it applies the same decimal or binary step as mb to kb.
Is this mb to kb converter free to use?
Yes. It is free, needs no account, and runs in your browser, so there is nothing to install or sign up for.
Can I use this as a general file size converter?
Yes. Beyond mb to kb, it covers bytes, KB, MB, GB and TB both ways, working as one file size converter for everyday use.
Updated 25 September 2026.