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calculting Z-Buffer accuracy..

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Z-Buffer accuracy depends on far/near clip plane ratio. When that ratio is big, Z-Buffer starts to lose accuracy. I want to know if it's possible to calculate the far/near ratio based on value of "minimum accuracy". For example, let's say that I want my Z-Buffer accuracy to be at least 0.5 units (game coordinates). That means if 2 polygons are at least 0.5 units apart on Z-axis in eye space, then the Z-Buffer algorithm should sort them correctly. But if those polygons are closer that 0.5, then it can't be determined which to draw first. So how do I calculate far/near ratio for minimum accuracy of 0.5? ..lets assume that my 3D card uses 32 bit Z-Buffer

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