Fuel cost is the cost of the fuel for a stage of the spacecraft. This is the combined price for the fuel itself and for the handling of the fuel. More energetic fuels are generally harder to handle, either because they are extremely reactive, even explosive or because they are cryogenic. Given exhaust velocity, exhaust velocity scale, fuel mass and lox price, fuel cost is calculated which is in turn used to calculate total fuel cost.

fuel cost = fuel mass * lox price * pow( ( exhaust velocity / 3,330 ), exhaust velocity scale )

total fuel ( second stage ) = fuel cost ( first stage ) + fuel cost ( second stage )

total fuel ( third stage ) = total fuel ( second stage ) + fuel cost ( third stage )
 

This is used in spacecraft cost.
 
 

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