Sports Diagrams > Football Field Diagram
This is a diagram of a NCAA/NFL football field in PDF format. It is sized for an 8.5 x 11 sheet of paper. The width and hashmarks are to scale. (NCAA hashmarks are farther apart.) The yardline numbers have been enlarged a little for readability. I highlighted the 20-yard lines in red to show the 'red zone'. If you don't want that you can print the file in black and white.
These are free, download the pdf files and print as many as you need.
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I can't find a similar official diagram for the NFL, but here's a link to the Digest of Rules covering the field.
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