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File size on disk is not the same as file size on the screen.
If you compress files 80% or level 8 on Adobe which is close to the same, you will have a reasonable file size. It doesn't change how big it looks on the website, it just makes a bigger or smaller file size.
Image DIMENSIONS in pixels (and here's what you probably wanted) is measured something like this, 2 Megapixel camera = 1600 x 1200, 4MP 2460 x 1640 and up... The monitor that someone is viewing from can vary, but lets assume that people have a 19" monitor for the lower standard. (some might have 24" or larger monitors, which display in a greater native resolution. I don't want to go there and complicate the issue!)
This chip is 468 x 466, it will fit on an average monitor and look just fine. This is the number that matters for posting images on the web.
On my Sony 20" monitor with a native resolution of 1280 x 1024 the image above is 4 3/8 wide. Notice the numbers above 468... Hey it's about 4 1/2 inches wide on the screen! 
But on the back computer with a 19" monitor and 1024 display size, it's 6 1/4 inches wide. WOW, about half the screen! File size is 19k at 72 DPI not too bad and it won't take a long time to download and display.
This one is 989 x 535 and when I use a ruler to measure it on my monitor, it's 9 1/4 inches wide. Darn amazing, you can get a close estimate of how big the image will be on other peoples screens, by looking at the image dimensions, if everyone had the same resolution on their monitor. This one is over 13" wide on my other screen. Kind of big?
When you get whatever software you want to use, you can find Image > resize and set the longest side, or the first number to 200 to 300 and get a pretty good size image. (I think mine above are a bit large, but they were on my website)
When Greg set up the ChipGuide he standardized on 158 x 158 scans. 300 DPI. When you go look, almost everything he added over the years, is 158 x 158 pixels, to make it nice looking. We had old monitors (and dial-up connections) then, probably 13" or some people with big 15". Times have changed, the pixels haven't. The files there are around 15k average.
I suppose if someone wanted easy to remember numbers, 300 pixels at 300 DPI, and you would be "looking good".
Here's a scan I just made using the Twain source connection on IrfanView and a crummy old scanner that someone gave me. It is 300 DPI and 300 pixels square about 30kb file size. I did click the automatic color correction and the automatic sharpen before saving it. Everything done in IrfanView, free editing software.
Link: http://irfanview.com/ get the free plugins too.
I have CS3, Photoshop, Elements, Lightroom, Corel, and a stack of others, but for quick chip editing, I just hit Irfanview. It scans, edits and adjusts, without loading some massive creative software. It's fast... and IT'S FREE
Want to clone, do layers, cut circles (like for chips) fill with a bucket, paint, draw, isolate, and a whole bunch of other things? It's like a mini Photoshop, and once again... IT'S FREE!
It started development as an undergraduate college senior design project mentored by Microsoft, and is currently being maintained by some of the alumni that originally worked on it. Originally intended as a free replacement for the Microsoft Paint software that comes with Windows, it has grown into a powerful yet simple image and photo editor tool. It has been compared to other digital photo editing software packages such as Adobe® Photoshop®, Corel® Paint Shop Pro®, Microsoft Photo Editor, and The GIMP.
Any questions?
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