Seller math guides

Know the difference before you judge if an item is worth listing.

A practical pricing workflow for cost, fees, shipping, demand, and offers.

A checklist of the fees that quietly eat margin on seller platforms.

How to include boxes, mailers, tape, labels, and inserts in profit math.

How returns change break-even price and real net profit.

How to decide if free shipping helps or hurts order profit.

How discounts change margin, profit, and break-even price.

How to estimate the ad cost that still leaves room for profit.

How bundles and multipacks affect unit economics.

How to adjust for storage time, markdowns, and holiday demand.

How to clear slow inventory without ignoring true cost.

How pickup deals change fees, delivery cost, and risk.

How duties, labels, and higher return friction affect profit.

A unit economics checklist for subscription boxes and repeat orders.

How to evaluate wholesale lots before buying inventory.

How to include labor, materials, fees, and packaging in handmade prices.

How to estimate net profit for digital downloads and templates.

How to compare traffic, fees, payment cost, and customer ownership.

A plain-English overview of profit records sellers should keep.

How fast inventory needs to sell before your cash is trapped.