Guamlite,

Welcome!

It's more complex than that. If you want your blanket to measure to a certain size, you'll first have to do a gauge swatch with the yarn and size hook you've chosen. This gauge swatch (no worries...just about everyone hates making them) will tell you how many stitches and rows you get to an inch. Then you can use that information to calculate out the number of stitches you'll need to make the blanket the size you want. Since everyone's gauge is different and there are different sizes of yarn and hooks you may choose, these numbers will be unique to you. This is why I can't do a gauge swatch and give you solid numbers, because I may crochet tighter or looser than you do, so my numbers would be completely different from your numbers, even if I used exactly the same yarn and hook.

Once you've made a gauge swatch, you can then input the number of stitches. Say you've discovered you need 100 stitches to produce a certain size. You'd enter "100" and then the system will calculate out the number of rows. At this time you can't designate the number of rows. That's because when we originally developed the freePatternWizard, we were worried people would skew or truncate their patterns by designating a number of rows that was too large or small. So for now, the only way to add or subtract rows is to add borders to your original image so you get the result you want.