The SellersNest blog
online selling Guides for Sellers
Plain explanations of what selling online actually costs, with the calculator that answers each one.
Holiday Return Policy 2026: Set Deadlines Without Losing Margin
Set holiday return deadlines, exclusions and refund costs without guesswork.
Mercari Selling Fees: What Sellers Pay and Keep
Calculate Mercari’s 10% selling fee, including buyer-paid shipping, and see payout, profit, withdrawal and pricing examples for US sellers.
Is an eBay Store Worth It? Calculate Your Break-Even Point
Compare eBay Store plans and calculate when Basic or Premium becomes cheaper.
Etsy VAT Explained: UK and EU Seller Guide
Understand Etsy VAT on buyer orders and seller fees, calculate VAT-inclusive prices, and check UK and EU registration rules.
Etsy Listing Renewal Fees: What Sellers Pay
Learn Etsy’s $0.20 listing renewal fee, auto-renew sold charges, multi-quantity costs and when to choose automatic or manual renewal.
How Much Does Poshmark Take? Seller Fees Explained
Calculate Poshmark’s $2.95 and 20% seller fees, see payout examples and set profitable prices and offer limits before you sell.
Gross Profit vs Net Profit: What Ecommerce Sellers Actually Keep
Learn gross profit vs net profit for ecommerce, calculate both margins correctly and find the costs that quietly reduce what your store keeps.
FAQ Schema for Ecommerce: Does It Still Help SEO?
Learn when ecommerce sites should use FAQ schema, how to create valid JSON-LD, Google’s rich-result limits and common markup mistakes.
Etsy Combined Shipping: Set Additional Item Rates Without Losing Money
Learn how Etsy combined shipping works, calculate profitable additional-item rates and avoid undercharging for multi-item orders.
Customer Lifetime Value: How Ecommerce Sellers Calculate CLV
Learn how to calculate ecommerce customer lifetime value, compare CLV with acquisition cost, and increase repeat purchases without hurting profit.
Contribution Margin: What Each Ecommerce Order Really Earns
Learn how to calculate ecommerce contribution margin, include the right variable costs, find break-even volume and make better pricing decisions.
Sell-Through Rate: How Online Sellers Find Slow Stock
Learn how to calculate ecommerce sell-through rate, compare SKUs, diagnose slow inventory and improve stock decisions without destroying margin.
ROAS vs ROI: Which Ecommerce Ad Metric Actually Matters?
Learn the difference between ROAS and ROI, calculate both correctly, include real ecommerce costs and judge whether an ad campaign is truly profitable.
Inventory Turnover Ratio: How Online Sellers Find Slow Stock
Learn how to calculate inventory turnover, convert it to days of stock, identify slow SKUs and improve reordering without causing stockouts.
Break-Even Point for Online Sellers: Formula and Examples
Calculate your ecommerce break-even point using fixed costs and contribution margin. Includes formulas, examples, discounts, returns and target profit.
Landed Cost Formula: Calculate the True Cost of Imported Products
Learn how to calculate landed cost per unit, including freight, duties, customs, insurance and handling, before setting a profitable selling price.
Ecommerce Return Rate: How to Calculate It and Reduce Avoidable Returns
Learn how to calculate ecommerce return rate, measure the real cost of refunds, find avoidable causes and reduce returns with better listings and packaging.
How to Create SKU Numbers for Inventory Without Making a Mess
Learn how to create a simple SKU system for ecommerce inventory, product variations, spreadsheets, stocktakes and reorder decisions.
Ecommerce Conversion Rate: How to Calculate and Improve It
Learn how to calculate ecommerce conversion rate and improve product pages with better images, trust signals, shipping details and profitable pricing.
Customer Acquisition Cost: How Online Sellers Know If Marketing Pays
Learn how to calculate customer acquisition cost, compare CAC with profit and lifetime value, and decide whether your ecommerce marketing is sustainable.