Free interactive financial models, fee estimators, and profit calculators designed by Carinex Tech to help e-commerce brands, sellers, and creators protect their net margins.
PayPal Fee Calculator
Calculate domestic vs international PayPal merchant fees, cross-border conversion spreads, and exact invoice amounts to receive target net payouts.
Stripe Fee Calculator
Accurate breakdown of standard credit card processing, international interchange fees, currency conversion, and net bank deposits.
Shopify Fee & Profit Calculator
Calculate total monthly Shopify costs across Basic, Shopify, and Advanced plans. Find out exactly when upgrading plans saves you money.
TikTok Shop Profit Calculator
Calculate real take-home net profit per unit in US, UK, and EU after referral fees, creator affiliate commission, VAT/taxes, shipping, and return loss.
TikTok Ad ROAS & Break-Even Calculator
Find your exact target break-even return on ad spend (ROAS) and maximum allowable CPA on TikTok Shop ads before burning marketing budget.
Shopify vs TikTok Shop Comparison
Compare platform commission rates, payment processing fees, and see exactly how much revenue you retain annually with an independent storefront.
Profit Margin & Markup Calculator
Quickly convert wholesale supplier costs into target retail prices and calculate gross margin percentages and markups for any physical product.