Sometimes I do quick running records on post it notes. I have them read and I just make a check for each word they get, and a dash when a word is missed. This is a really quick way for me to do it. Other times, I will just write down the words they miss, and how they missed it. This is not formal at all. I will do it every once in awhile as a check in, when I am concerned about the level of their SSR book, but don't have it in my plans to actually do a real running record on them. I can tabulate the general fluency rate with the formula on the webpage. I just divide the number of words read by the number of errors.
Be sure that if the child self corrects, that does not count as an error. Either does repeating a word. Sometimes kids will skip a whole line, and that really does them in!! I will give them another shot, because sometimes I think they are nervous and trying to read quickly to impress me and end up skipping lines. These are my poorest readers though, generally.
I look for replacing words, skipped words, repeating a word (this is ok in my book if it is only once or so, they are usually just reminding themselves of what they read, but if can affect fluency) if they have to stop and sound it out, do they need me to tell them the word a few moments, all of these are things I look for. My school doesn't do the DRA or any formal assessment, so I need to make up a good deal of this stuff on my own.
I choose a passage of 100 words generally, or I use a book from Scholastic called 3 minute reading assessments.
I found this link: