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Mithral FAQ Weight wrote:
Mithral FAQ
What weight do I use to determine the price of a mithral weapon or non-armor item?
To determine the additional price for the mithral (as compared to the normal item's price), use the non-mithral item's original weight and multiply that by 500 gp per pound.
For example, a steel dagger for a Medium creature weighs 1 pound. For its mithral equivalent, multiply that weight (1 lb.) times 500 gp/pound, or +500 gp. When added to the original item's cost (2 gp), the mithral dagger's total price is 502 gp.
There are likely some inconsistent mithral item prices in print, and these will be addressed in future printings of these books, as appropriate.