What's the 2020 Toyota Corolla steering wheel size?

If You're purchasing a replacement steering wheel for the 2020 Toyota Corolla, You'll be looking for one that has an outer diameter of 14-1/2 inches, with a grip circumference of 4-1/4 inches. However, if You're instead purchasing a steering wheel cover, I'd advise You to purchase one that's custom made for Your vehicle. The reason for that being, steering wheel covers are finicky. If You buy something even a millimeter too big, it won't feELRight in Your hands. If You buy something even a few millimeters too small, it won't physically fit over the steering wheel. Therefore, "universal" steering wheel covers typically leave much to be desired, one way or the other. There are a wealth of 2020 Corolla steering wheel covers available, so You'd do best to choose among those.