フリマ利益計算機

When I was selling on Mercari, and when I was not accustomed to dealing with sudden discounts, I set the price without considering handling fees and shipping charges, so I didn't make a profit.
Isn't that what you mean?

As a countermeasure, this app calculates the shipping fee, handling fee, and profit by entering the planned sales price and shipping method.
(Use as a guide only)