The angular diameter of VV Cephei A can be estimated using photometric methods and has been calculated at 0.00638 arcseconds. This allows a direct calculation of the actual diameter, which is in good agreement with the derived from a complete orbital solution and eclipse timings. Analysis of earlier eclipses had given radius values between and and an upper limit of . The diagrams of the roche lobe of VV Cephei A are contradictory, for example, the roche lobe is calculated to be about , thus the radius cannot be larger than this, although in another diagram, the roche lobe is calculated to be much larger at . The size of the secondary is even more uncertain, since it is physically and photometrically obscured by a much larger disc across. The secondary is certainly much smaller than either the primary or the disc, and has been calculated at to from the orbital solution.