This link has a Penny weight scale. You can put in the amount and it will figure out the Penny weight value. Each type of gold is valued differently because the amount of alloy along with the amount of gold.
The first thing would be to separate into 10K-14K-18K and 24K and use this calculator on the page: http://www.goldfellow.com/gold-prices2.aspx#
Prices of gold changes hourly, so this calculator will help. Joan