United States

Practical guides & calculators for US ecommerce sellers

Plain-English playbooks in USD covering Shopify, Amazon FBA, Walmart Marketplace, Etsy, TikTok Shop, US sales tax nexus, shipping, and ad budgets.

Latest US articles

Shopify 15 min read

Shopify Profit Margin Calculator: Formulas, 2026 Fee Tables & US DTC Case Study

Learn how to calculate true gross, net, and contribution profit margins on Shopify US. Includes 2026 Shopify plan fee rate cards, markup vs margin formulas, and a USD case study.

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Etsy 15 min read

Etsy Fee & Profit Calculator: Complete 2026 US Fee Schedule, Formulas & Case Study

Calculate your true profit per Etsy order in USD. Detailed breakdown of 2026 listing fees, 6.5% transaction fees, 3%+$0.25 payment processing, and 12-15% Offsite Ads.

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Amazon FBA 14 min read

Amazon FBA Break-Even ROAS & Target ACOS Calculator Guide (2026 US Formulas & Case Study)

How to calculate true break-even ROAS and target ACOS on Amazon FBA US. Includes 2026 FBA fee breakdowns, inbound placement fees, USD worked case study, and formulas.

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TikTok Shop 14 min read

TikTok Shop Profit Calculator for US Sellers (2026 Fee Structure & Net Margin Guide)

Complete 2026 profit and fee guide for US TikTok Shop sellers. Calculate 6%-8% referral fees, affiliate creator commissions, shipping subsidies, ad ROAS, and net payout.

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Walmart Marketplace 11 min read

Walmart Marketplace Fee Calculator Guide for US Sellers

How Walmart Marketplace fees work for US sellers, plus a step-by-step calculator you can rebuild in a spreadsheet or on AIFlowBiz.

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US Tax 12 min read

Sales Tax Nexus Checklist for US Ecommerce Sellers

A plain-English checklist to understand US sales tax nexus for ecommerce — economic, physical, and marketplace-facilitated. Not tax advice.

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Shopify 14 min read

Reorder Point & Safety Stock Calculator for Shopify: Formulas, Z-Score Tables & USD Case Study (2026)

Learn the reorder point and safety stock formulas for Shopify US stores. Includes Z-score service level tables, lead time variance math, and a worked USD inventory case study.

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Marketing 11 min read

Ecommerce CAC Payback Calculator: Know When Ads Pay Back

Learn how to calculate customer acquisition cost payback for a US ecommerce store, with an editable USD example and free tools.

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Shipping 11 min read

USPS vs UPS vs FedEx Shipping Cost Calculator for Ecommerce

Compare USPS, UPS, and FedEx shipping costs for US ecommerce orders with a repeatable calculator, editable USD example, and best practices.

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Marketing 11 min read

Ecommerce Ad Budget Calculator for Small US Businesses

How to set a monthly ecommerce ad budget for a small US business — with a clear formula, editable USD example, and free tools.

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Advertising 9 min read

Break-Even ROAS Calculator: Find the Minimum ROAS Your Store Needs

Learn how to calculate break-even ROAS using product cost, shipping, fees, and returns — with a free USD calculator.

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SEO 10 min read

Product Image Alt Text: 50 Examples for Shopify and Ecommerce Stores

50 ready-to-use product image alt text examples for Shopify, Amazon, Etsy — clothing, beauty, home, electronics, accessories, marketplace angles.

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Content 9 min read

25 Shopify Product Description Prompts for Clothing, Beauty and Home Products

25 tested ChatGPT prompts for Shopify product descriptions across clothing, beauty, and home — with edit-before-publish workflow.

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Shopify 14 min read

Free Shipping Threshold Calculator for Shopify: Mathematical Formulas, AOV Lift Tables & 2026 US DTC Case Study

Calculate the most profitable free shipping threshold for your Shopify store. Includes AOV lift formulas, margin absorption math, shipping rate tables, and a worked USD case study.

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Operations 11 min read

Ecommerce Return Rate Calculator for Shopify, Amazon and eBay Sellers

Calculate return rate, lost profit, and adjusted margin for Shopify, Amazon, and eBay stores. Includes a free browser calculator.

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Sourcing 13 min read

Landed Cost Calculator for US Ecommerce Importers

Calculate the true landed cost per unit for US ecommerce imports — product, freight, duty, insurance, packaging, and warehouse allocation.

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Inventory 10 min read

Inventory Days of Cover Calculator for Online Stores

Calculate how many days your on-hand stock will last, plus reorder pressure signals for lead time and safety stock. Free tool + guide.

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Shopify 11 min read

Shopify Bundle Pricing Calculator for Product Kits

Price product bundles on Shopify without eroding margin after discount and shipping. Includes formula, examples, and a free calculator.

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Amazon 12 min read

Amazon FBA Storage Fee Planner for Small Sellers

Plan Amazon FBA storage costs manually. Includes formulas for monthly and long-term storage, plus a free browser estimator.

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Finance 13 min read

Ecommerce Cash Flow Forecast Template for Small Online Stores

A 90-day ecommerce cash flow forecast covering inventory buys, ads, payouts, and returns — with a free browser calculator.

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Finance 12 min read

Marketplace Payout Reconciliation Template for Etsy, eBay, Shopify and Amazon

Reconcile expected vs actual marketplace payouts from Etsy, eBay, Shopify, and Amazon. Free template and browser tool.

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Legal 11 min read

Ecommerce Refund Policy Template for US Online Stores

A practical refund policy structure for Shopify, Etsy, and DTC US stores. Editable template and free generator. Not legal advice.

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Inventory 12 min read

Product Launch Inventory Calculator for Shopify Sellers

Estimate launch stock from expected traffic, conversion rate, ad budget, and supplier lead time. Free browser tool for Shopify sellers.

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Automation 12 min read

How to Reduce Manual Sales Work in a Small Business

Learn how to reduce manual sales work with templates, follow-up systems, dashboards and simple automation workflows.

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US-focused free tools

Profit Calculator

Marketplace Fee Calculator

ROAS Calculator

Shipping Cost Calculator

Reorder Point Calculator

CAC Calculator

Ad Budget Planner

Invoice Generator

Educational content only. Not financial, tax, or legal advice. Always confirm current marketplace fees, carrier rates, and US tax rules from official sources.