There is this site where you can take a picture and have it made into a chart for you, but it is not real percise and you still have to do some thinking. I've used it though and it is a start.
Or like Cam said figure it out on graph paper.
I was thinking of scaling things down, for instance if it had a center vertical line that used 9 squares of chart to cut it down to maybe 5. That is still an odd number. Work on proportioning things like that. It is basically drawing it yourself but using some math to help you.
Here's a link to the site I mentioned. Check it out. LINK