To find the right lid for your cookware, choose a size that is listed with measurements the same size or slightly smaller than the inside diameter of your cookware. Revere Ware lids are usually just slightly smaller than the cookware they fit. Ebay listers will show this as anywhere from 1/16" to 1/4 inch smaller than your cookware diameter. Very few Revere Ware pots in our experience have a diameter that is NOT a whole inch; exceptions we have found include a 6 1/4" skillet (that takes a 6" lid) and 5 1/2" saucepans. However, based on auction listing we've seen, there do appear to be 6.5" and 7.5" sizes as well.

For example, lids listed measuring 5.25 (5 1/4), 5.3125 (5 5/16), 5.375 (5 3/8), 5.4375 (5 7/16), and 5.5 (5 1/2) inches are all probably the same size measured slightly differently by different sellers and should all fit a saucepot with a 5.5" inside diameter.