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![begin mathsize 36px style 1 over d squared equals fraction numerator h squared plus k squared over denominator a squared end fraction plus space l squared over c squared end style](/New/sites/all/libraries/ckeditor//plugins/ckeditor_wiris/integration/showimage.php?formula=a3b7a85b0a4f2a5a9e30d48fb56685e1.png)
d= Interplanar Spacing ; h , k , l = Miller Indices; a ,c = Lattice Constants
Tetragonal Lattices have two distinct sides which are termed as a and c (a=c means it is cubical). The interplanar distance can be calculated by the Miller Indices using this chemistry calculator.