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two large eggs = 1 jumbo egg
Yes, after jumbo eggs, the next size is generally referred to as "extra large" in terms of egg size. Extra large eggs are slightly smaller in size compared to jumbo eggs but larger than large and medium-sized eggs.
Jumbo, or Extra-Large eggs weigh 71-73g depending on the country of sale; large eggs weigh 63-73g, so you should use seven large eggs to approximate six jumbo eggs.
2 jumbo and 1 large is approximately 194 gm. 3 extra large is about 186 gm. 2 Jumbo and a medium is closer at 187 gm
9 large eggs equals 7.2 extra large.
4 large is 210 gm. 3 extra large is 206 gm
That is approximately 3 jumbo.
You can substitute extra large eggs for baking. The important thing to remember here is the amount of liquid you are putting in your baked item. For example, if you are making a cake that calls for three large eggs, you can probably substitute that with two extra large eggs, because it makes the same amount of liquid.
An extra large egg has about 4 tablespoons of liquid and a large egg is about 3 1/2 tablespoons of liquid (http://bakingbites.com/2008/09/large-eggs-vs-extra-large-eggs-in-baking/) so 7 extra large eggs is the same as 8 large eggs.
One large egg is the equivalent to 1.67 ounces, so a little less than two large eggs.
Eggs are sized by weight, and an extra large egg will weigh anywhere between 1 and 10 grams more than a large egg. Given that your recipe calls for 2 extra large eggs, that means a maximum difference in weight of 20 grams. There are slightly more than 28 grams in an ounce, so we're talking about a MAXIMUM difference of two thirds of an ounce, and a minimum difference of less than a tenth of an ounce of egg. If there were four or more extra large eggs involved, I would use an additional egg, under this circumstance, I would just use the largest two eggs in the carton you can find and not worry about it.