I have some experience in this area. In my career as a software designer, I was involved in the development of costing systems for industry for the past 25 years. As a potter, I have often applied these same principals to my own craft.
Let me first start my saying that the most important thing you can do is to get an idea of what successful competition for similar products, or product of similar value, are charging, if possible.
Method 1 - I know my costs and production capacity
Decide what your annual costs are and the optimum number of units you can produce in a year. Since crafts are labor intensive, you should consider "Direct Hours" as your units. In costing, this is referred to as a Driver, since this is what drives your cost. "Direct Hours" are only those hours which DIRECTLY ADD VALUE to your finished product.
Example... Your Fixed Costs: You will need $50,000 to cover your salary, rent, utilizes, insurance, etc. Your Variable Costs: You will $10,000 to cover your materials and supplies needed in your production plan. Direct Hours available this year: You will be working an average of 30 hrs per week in your business, but only 50% will be direct hours.
52 wks x 30 hrs per wk x 50% = 780 direct hrs
Your price per direct hour will be ($50,000 + $10,000) divby 780 = $76.93 per direct hour.
In this example, we are going to assume that you consume variable costs such as materials by the hour. If you consume variable cost by the piece you could substitute this formulae
If it takes you 10 direct hours to make a piece, your price will be 10 x $76.93 = $769.30 per unit. Proof: Of your 780 available direct hours, you can make 78 identical items. (780 hrs divby 10 hrs per unit = 78 units). Your total revenue for the 78 items @ $769.30 each would be $60,006.40
Method 2 - I know my costs and the market price for my product
Decide what your annual costs are and the price of a representative product of similar quality. or successful product. As in method 1, since crafts are labor intensive, you should consider "Direct Hours" as your units.
Example... Your Fixed Costs: You will need $50,000 to cover your salary, rent, utilizes, insurance, etc. Your Variable Costs: You will $10,000 to cover your materials and supplies needed in your production plan. Your ideal price for a given product: Say that you've seen a similar craft to your craft-A is priced at $769.30
The minimum number of craft-A product you must produce in a year is ($50,000 + $10,000) divby $769.30/unit = 78 units.
Of course, if you only plan to make 8 of these, that's okay. Just evaluate your other crafts craft-B, craft-C, etc. the same way. Whatever your product mix, your production plan should add up to $60,00 in sales, and 780 hrs in direct labor (in this example)
If it takes you 10 Direct Hours to make each one, your Price per Direct Hour will be $769.30 per unit divby 10 hrs = $76.93 per hr.
Variation on Method 1
Method 1 assumes that you are going to consume variable costs such as materials by the hour. In some cases it may be more realistic to consume these costs by the item, then...
Your price per direct hour will be ($50,000 total fixed costs) divby 780 direct hours = $64.11 per direct hour. ($10,000 total variable costs) divby 78 items = $128.21 per item.
So if one item takes 10 direct hours, your price will be
10 dir hrs x $64.11 per dir hr = $641.10
1 item x $128.21 per item = $128.21 $641.00 + $128.21 = $769.31
Hope this helps