Senior EcomCalcTools Analyst · Author of EcomCalcTools Blog
Amazon FBA · Etsy · ROAS/ACOS · Stripe & PayPal · Platform ComparisonsRyan Cole is the Senior Analyst at EcomCalcTools, specializing in ecommerce fee structures, marketplace economics, and digital marketing performance metrics. With a focus on practical, data-driven guidance, Ryan helps ecommerce sellers and marketers make better-informed decisions using free online calculators.
Ryan's analysis covers platforms including Amazon FBA, Etsy, eBay, Shopify, Noon, Ozon, Wildberries, Kaspi.kz, and Mercado Libre, as well as payment processors Stripe and PayPal. All fee rates referenced in articles are based on official platform documentation.
Expertise: Ecommerce platform fees · Marketplace commission structures · Payment processing costs · Advertising ROI (ROAS, ACOS) · Profit margin analysis · International VAT and tax compliance
Full referral fees, fulfillment fees, storage costs, and monthly Long-Term Storage fees. Updated for 2026 rate changes.
AmazonACOS, TACOS, and ROAS explained with formulas, benchmarks, and strategies to reduce advertising costs on Amazon Sponsored Products.
MarketingUnderstand how ROAS, ACOS, and TACOS interact to reveal your real profitability on Amazon FBA after all fees.
AmazonStrategies for lowering referral fees, FBA storage costs, and unnecessary charges across your Amazon seller account.
AmazonROAS vs ROI vs ACOS — how to calculate each, when to use which metric, and how to set realistic targets by platform.
MarketingTypical ROAS ranges for Facebook and Instagram ads across ecommerce verticals. Includes break-even analysis for 5 industries.
MarketingFee-by-fee comparison of Stripe and PayPal for online sellers. Includes international rates, currency conversion, and platform integration costs.
PaymentsCompare Stripe, PayPal, Square, Braintree, and Adyen for online stores. Fees, features, and integration options side by side.
PaymentsSide-by-side comparison of fees, traffic, tools, and scalability for handmade sellers choosing between Etsy and Shopify.
CompareTransaction fees, payment processing, subscription tiers, and listing costs compared across both platforms for US sellers.
CompareReferral fees, FBA vs Etsy Standard Delivery, and payment processing compared for products sold on both marketplaces.
CompareMarkup percentage vs gross margin percentage — which to use for pricing, how to convert between them, and common mistakes to avoid.
FinanceFixed costs, variable costs, contribution margin, and break-even formulas with practical ecommerce examples across multiple platforms.
FinanceAverage repurchase rates by industry: beauty 40-50%, fashion 25-35%, subscription 80-90%. How to improve repeat purchase rate.
FinanceCalculate return on ad spend with break-even analysis
Domestic, international, and ACH transaction fees
Compare PayPal fees vs other payment processors
Gross, net, and operating margin in one tool
Referral, fulfillment, and storage costs for FBA
Transaction, listing, and offsite ads fees
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