Carat is a unit of WEIGHT, not area. Impossible to answer without knowing how THICK the stone is. Even then it would be a best guess. However, that is a very large ruby.
How much is a 20x15 mm Chatham ruby oval in shape in carats
2267.96185 carats.
1 ounce is 138.29 carats.
7 CARATS
30,000 carats.
There are roughly 2,267 carats in a pound.
5 Carats.
About 141.7 carats per ounce.
Five carats.
One ounce = about 141.7 carats.
There are 45.52 carats on the hope diamond
Two grams is 10 carats.