How do I calculate end of year inventory? Beginning of Year+Purchases-Sales calculates like I don't have any inventory left; which I do.

[lanaemiller]

I started an online store in 2016, ending inventory $4339, purchased $12,170 "wholesale" in new inventory, total 2017 "retail" sales of $16,033. If I use the formula of Beginning of Year + Purchases - sales then the calculation shows I have no inventory which I do. I'm so confused. 

[Marketstar]

The simple Cost of Goods Sold equation is beginning inventory plus purchases minus ending inventory.

You should enter all three at your actual out of pocket cost.

Your ending inventory is simply the inventory you have left (if any) on December 31, 2017 entered at your actual out of pocket cost.