KB to MB Converter

Convert kilobytes to megabytes instantly, with a reference table for images, documents and web page budgets.

Kilobytes

Megabytes

1 KB = 0.001 MB

Multiply kilobytes by 0.001 to get megabytes.

The link carries the values you entered, so whoever opens it sees the same result. Nothing is stored on our side — the numbers travel in the link itself.

Kilobytes to megabytes reference table

The conversions people look up most often, rounded to 5 decimal places.

Common kilobytes to megabytes conversions
Kilobyte (KB)	Megabyte (MB)
100 KB	0.1 MB
500 KB	0.5 MB
1,000 KB	1 MB
1,024 KB	1.024 MB
2,000 KB	2 MB
5,000 KB	5 MB
10,000 KB	10 MB
25,000 KB	25 MB
50,000 KB	50 MB
100,000 KB	100 MB

The kilobytes people look up most

500 KB = 0.5 MB: About a long web page with everything it loads.
1,000 KB = 1 MB: Where file managers stop counting in kilobytes and switch their display.
1,024 KB = 1.024 MB: One mebibyte - the binary megabyte Windows uses, which is why a file can look smaller on a Mac.
2,048 KB = 2.048 MB: Older forum and webmail attachment limits were usually set here.
5,000 KB = 5 MB: A high-resolution photograph straight off a camera, before any compression.

How the kb to mb calculation works

Using the decimal definition, 1 MB = 1,000 KB:

megabytes = kilobytes ÷ 1000

For the binary figure, divide by 1,024 instead. At this scale the two differ by 2.4%, which is small enough to ignore for most purposes and large enough to notice on a tight upload limit.

Web performance is where kilobytes still matter. Page weight is budgeted in KB because the difference between a 200 KB page and a 2,000 KB one is the difference between loading instantly and losing the visitor:

A well-optimised web page: 500–1,500 KB total (0.5–1.5 MB)
A compressed JPEG for the web: 100–300 KB
A modern WebP or AVIF of the same image: 40–120 KB
A web font: 20–100 KB per weight
This page's HTML, before images: usually under 100 KB

Image compression is the single biggest lever. A photo straight from a phone is 3,000–8,000 KB (3–8 MB). Resizing it to the dimensions it is actually displayed at and saving as WebP typically lands under 150 KB — a 95% reduction with no visible difference on screen.

Documents:

A plain text file: 1–50 KB
A Word document with no images: 20–100 KB
A PDF with images: 500–5,000 KB

Google's Core Web Vitals measure Largest Contentful Paint, which is usually an image. Getting the largest image under about 200 KB is often the difference between passing and failing the threshold — and on a site funded by ads, a failing LCP costs both rankings and revenue.

Frequently asked questions

Why is a long document so much smaller than one photograph?

Text is about one byte per character, so an entire novel fits comfortably under 1,000 KB. An image records colour for every pixel, and even compressed it carries more data than a shelf of books. This is also why text compresses dramatically while an already-compressed photograph barely compresses at all.

How small should an image on a web page be?

Under about 200 KB for a large photograph and well under 100 KB for anything smaller. Page weight is the single biggest lever on load time for visitors on slow connections, and modern formats such as WebP and AVIF reach those sizes at a quality most people cannot distinguish from a far larger JPEG.

Does deleting lots of small files free useful space?

Rarely. A thousand files of 500 KB comes to half a gigabyte, which is noise on any modern drive. Space is almost always consumed by video, game installations, virtual machine images and system caches. Sorting a folder by size finds the real culprits in seconds, which hunting through directories does not.

KB to MB Converter