Calculating the fair share of anything, whether it be property, stock, or any other type of asset, can be difficult or easy depending on how many parties are involved and what, if any, preexisting terms define the initial ownership of the asset that's being split. For the sake of example, this article will assume that there are two parties involved who have an equal share in the asset that needs to be split.
Determine the monetary value that is assigned to the asset in discussion. This can be done by researching similar items or checking an index of prices, if the asset in question is a stock or commodity that is publicly traded.
Divide the monetary value of the asset by two, since in this case there are two parties and the ownership is evenly split.
The result of the division made in Step 2 represents the amount that each party shall receive, or the "fair share" amount.