This is often because the display setting are set to greater than 100%. You can set the display setting back to 100% and print, or you can choose the print to PDF option in the print dialog. Then when you print the PDF make sure you check the "Actual Size" checkbox.
Other things to try....
1. Adjust Compatibility Settings
2. Print to PDF instead of to screen or printer.
4. Use a different computer without a high resolution monitor
5. Adjust the monitor resolution down