Business & seller tools

Run your shop with profit margin and markup math, find break-even units before you scale, price products with target margins, estimate print-on-demand profit after platform fees, and reverse-engineer list prices from desired net payout. Built for Etsy, Amazon, Shopify, and marketplace sellers who need quick what-if numbers — not accounting software, but fast sanity checks before you list.

The distinction that trips up most sellers is margin versus markup. Markup is profit as a percentage of your cost; margin is profit as a percentage of the price the customer pays. A 50% markup on a $10 item gives a $15 price and a 33% margin — the same dollar profit described two different ways. Use the reverse fee tool when you know the payout you need and have to work backwards to a list price, and the break-even tool before committing to a production run or bulk inventory buy. These tools model one unit at a time, so recurring overheads like subscriptions, storage, and advertising need to be layered on separately.