These are actually two different processes. For example, you might know how much something costs you to produce, but that doesn't mean you know what price to charge for it.
Pricing depends on:
If you have the cash reserves, you could provide a service below cost if there are other benefits, such as advertising value or the cost of moving into a new market niche, or spin-off advantages for other more profitable products.
Or what if the market price is much higher than you would provide the service for? You stand to make a large profit, but I suggest you look for hidden costs first.
Calculating a break-even point
Calculate the point at which you will break even, that is, the point at which you will recover all costs.
It sounds easy. You buy a widget for 50c. It proportionally costs you 25c to run your shop and pay your wage while you sell the widget. So if you sell for 75c, you break even.
Of course, it soon gets more complex, because you have both fixed and variable costs. Nevertheless, you know you can't sell widgets for less than the break-even point.