- Use a stiff ruler. I keep a trusty wooden ruler in my desk. Plastic is OK if it's stiff. Just don't use a cloth tape measure.
- Find the sides. These are the straightest parts of the plate. Measure across from side to side.
- Try to use the nearest 1/8 inch.
- Most salad plates are 7 inches; lunch are 8 inches. Fostoria liked to fool us and their plates are 7 1/2 or 8 1/2, with only a few measuring to the inch mark
How would you measure the Rose Point plate in the picture below? It is 8 inches across the flat sides and about 8 1/2 inches if you measure scalloped edge to scalloped edge. Try to always measure from the side to side, not diagonally. For plates with scalloped rims, look for "sides". My Rose Point plate has the more-or-less straight edges, and that is where you should measure from. Here's to measure a plate: