Just check around websites and find high-res versions. Import them into MS word. Double-click the image. Hit the 'size' tab and enter the real-world dimensions. Print, then check with a ruler. Works really well.
Get IrfanView (free download) or use MS PhotoEd. You can adjust the printed size in inches very precisely. Using MS Word, IMHO, is an extra complication and not as good for this purpose.