Once you've a vague idea of the words you'd like to rank for, you can use Google's Keyword Tool to see whether you're in the right ball park. (smallbusinessesdoitbetter.com)
Of course nothing is ever 100 % accurate, but the important thing is that you're in the right ball park now. (fitmole.org)
Folks with higher or lower calorie needs could simply use a factor and round off to get into the right ball park easily. (perfecthealthdiet.com)