Single integral expressions for the particle loss rate from an electrostatic trap withZe&Fgr;0/T≫1 are derived that span all possible mirror ratiosR, where &Fgr;0,Z, andTare the potential well depth, charge number, and species temperature. The two expressions are shown to be identical for a range of intermediateRso that one expression is valid for small to intermediateR(R≲1), while the other is appropriate from intermediate to largeR(R≫T/Ze&Fgr;0). Three particularly simple analytic limits are found to exist: (i)R≪T/Ze&Fgr;0, (ii)T/Ze&Fgr;0≪R≲1, and (iii)R≫1.