It has 94.4 cu. ft. of passenger volume. A Chevy Equinox has 99.7 cubic feet, '16 Volt 90.3, BMW i3 84, Nissan Leaf 92.
Cargo volume is 16.9 cu. ft.
Externally, it's a bit smaller than a Trax/Encore.
And although it's a different forum factor, as a matter of interest, the Model S has 95.1 cu. ft. of passenger volume, proportioned differently of course.