Turner angle is related to the density ratio mathematically by:
Meanwhile, Turner angle has more advantages than density ratio in aspects of:
* The infinite scale of  is replaced by a finite one running from +π to -π;
* The strong fingering () and weak fingering () regions occupy about the same space on the Tu scale;
* The indeterminate value obtained when  is well defined in terms of Tu;
* The regimes and their corresponding angles are easy to remember, and symmetric in the sense that if Tu corresponds to R, then -Tu corresponds to R. This links roughly equal strengths of finger and diffusive sense convection.
Nevertheless, Turner angle is not as directly obvious as density ratio when assessing different attributions of thermal and haline stratification. Its strength mainly focuses on classification.