MerchantCalcs publishing
Seller blog
Sourced, practical articles for making e-commerce decisions with better numbers.
Current publications
Research and guides
Each article shows its formulas, changing assumptions and verification sources.
Etsy seller profitEtsy Fees, Profit and Pricing: A Practical Seller GuideBuild an Etsy price from real order economics instead of subtracting one headline fee from revenue.→
Customs and logisticsHS Codes, Import Duty and Landed Cost for E-commerceUnderstand what an HS code can and cannot tell you before estimating customs duty, import tax and product landed cost.→
PricingMargin vs. Markup: The Pricing Difference Sellers Must KnowA practical explanation of why a 50% markup is not a 50% margin, with examples for small sellers.→
E-commerceHow to Calculate True Profit per OrderA step-by-step order profit method that includes product cost, shipping, ad spend, platform fees and returns.→
FinanceUnderstanding Contribution Margin for Small BusinessesUse contribution margin to decide which products, bundles or campaigns deserve more attention.→
AdvertisingHow Break-Even ROAS WorksLearn why a high ROAS can still lose money when margins are thin.→
E-commerceHow Returns Affect E-commerce ProfitModel refunds, reverse shipping and resale loss before a product looks healthier than it is.→
InventoryReorder Point and Safety Stock ExplainedAvoid stockouts by combining demand, supplier lead time and a realistic buffer.→
LogisticsDimensional Weight Explained for Online SellersWhy large lightweight packages can be billed above their scale weight.→
LogisticsUnderstanding Landed Cost Before You ImportBring freight, duties, insurance and handling into one per-unit cost.→
PricingHow Discounts Affect ProfitCalculate how many extra units a discount must sell before it is worth running.→
PricingCommon Product Pricing MistakesThe quiet pricing errors that turn popular products into weak businesses.→