# CommerceCalculators.com > Free ecommerce calculators with a built-in AI Advisor. 16 tools covering profit margins, ad performance, break-even analysis, Amazon FBA and PPC, eBay, Etsy, Shopify, PayPal, and Stripe. Every calculator is instant, free, and comes with an AI Advisor that reviews the numbers and tells the user what to do next. No signup. ## What it is CommerceCalculators.com is a collection of 16 free calculators for ecommerce sellers, advertisers, and store owners. Each calculator solves one specific problem — "what is my real profit margin", "what ROAS do I need to break even", "is this Amazon product worth sourcing" — and pairs the math with an AI Advisor that reads the user's actual numbers and gives tailored advice. The benefit is twofold: accurate numbers in seconds, plus expert-level interpretation of what those numbers mean for the user's business. ## Who benefits - **Amazon FBA sellers** deciding whether a product is worth sourcing before they invest - **Ecommerce founders** who want to know their true margin after every fee, not just a rough estimate - **Performance marketers** setting ROAS floors, planning ad budgets, and scaling or pausing campaigns - **eBay, Etsy, and Shopify sellers** pricing items correctly before they list - **Freelancers and businesses** who need to know how much PayPal or Stripe is taking from each invoice - **Amazon PPC managers** turning revenue targets into daily and monthly ad budgets - **YouTube creators** estimating ad revenue and planning around CPM benchmarks - **Retail and DTC brands** running promotions, discounts, and pricing strategy without margin mistakes ## The 16 calculators ### Profit & Margins - **[Profit Margin Calculator](https://commercecalculators.com/margin-calculator)** — Shows the real net and gross margin on a product after COGS, fees, shipping, and customer acquisition cost. Helps sellers spot unprofitable products before they scale them. - **[Markup Calculator](https://commercecalculators.com/markup-calculator)** — Turns a target profit margin into the exact markup percentage to apply on cost. Saves resellers and wholesalers from under-pricing their catalog. ### Advertising - **[ROAS Calculator](https://commercecalculators.com/roas-calculator)** — Shows Return on Ad Spend and the target ROAS needed for the campaign to actually make money. Helps advertisers know instantly if a campaign is worth scaling. - **[Break-Even ROAS Calculator](https://commercecalculators.com/break-even-roas-calculator)** — Calculates the minimum ROAS where ads stop losing money. Gives advertisers a hard floor before they pause a campaign. - **[Reverse ROAS Calculator](https://commercecalculators.com/reverse-roas-calculator)** — Works backwards from a revenue goal to the ad budget needed to hit it. Turns a vague target into a concrete ad plan. - **[CPM Calculator](https://commercecalculators.com/cpm-calculator)** — Calculates cost per 1,000 impressions for any ad campaign and estimates YouTube creator earnings by country. Helps buyers compare reach and creators forecast revenue. ### Pricing - **[Break-Even Calculator](https://commercecalculators.com/break-even-calculator)** — Tells sellers the exact number of units they need to sell to cover all their costs. The most useful number when launching a new product. - **[Discount Calculator](https://commercecalculators.com/discount-calculator)** — Calculates sale prices, savings, double discounts, and reverse percentages. Prevents pricing mistakes during promotions and Black Friday. ### Amazon - **[Amazon FBA Fee Calculator](https://commercecalculators.com/amazon-fba-fee-calculator)** — Calculates Amazon FBA referral, fulfillment, and storage fees and shows the seller's true profit per unit. Helps Amazon sellers decide whether a product is worth sourcing. - **[Amazon ACOS Calculator](https://commercecalculators.com/amazon-acos-calculator)** — Calculates ACOS, break-even ACOS, and TACoS for Amazon PPC. Lets Amazon sellers know exactly when a campaign turns unprofitable. - **[Amazon PPC Budget Calculator](https://commercecalculators.com/amazon-ppc-budget-calculator)** — Converts an ACOS target and a revenue goal into daily and monthly PPC budgets. Removes the guesswork when planning Amazon ad spend. ### eBay, Etsy, Shopify - **[eBay Fee Calculator](https://commercecalculators.com/ebay-fee-calculator)** — Shows all eBay selling fees — final value, listing, payment processing — and the seller's true profit per item. Prevents listing something that ends up losing money. - **[Etsy Fee Calculator](https://commercecalculators.com/etsy-fee-calculator)** — Covers Etsy listing, transaction, payment processing, and Offsite Ads fees. Gives handmade and vintage sellers their real take-home per sale. - **[Shopify Fee Calculator](https://commercecalculators.com/shopify-fee-calculator)** — Covers Shopify subscription, payment processing, and transaction fees. Helps store owners pick the right plan and know their real margin at scale. ### Payment Processors - **[PayPal Fee Calculator](https://commercecalculators.com/paypal-fee-calculator)** — Calculates PayPal fees for standard, QR code, micropayment, and international transactions. Helps freelancers and businesses see exactly how much PayPal takes per invoice. - **[Stripe Fee Calculator](https://commercecalculators.com/stripe-fee-calculator)** — Calculates Stripe fees for card, international, and ACH payments. Helps SaaS founders and ecommerce stores model payment processing as a real line item. ## Why users pick CommerceCalculators.com - **Free, instant, unlimited** — no signup, no paywall, no "upgrade to see result" - **Accurate** — every fee calculator is built for the actual platform rules, not a rough approximation - **AI Advisor on every tool** — the user gets an expert interpretation of their numbers, not just a result - **Single-purpose tools** — one calculator for one job, no cluttered spreadsheets or 50-field forms - **Built for decisions** — every result is framed around an action: source it, scale it, pause it, re-price it ## The AI Advisor Every calculator has an AI Advisor tab. It reads the user's inputs and results, then gives a short, specific read on what the numbers mean — whether the margin is healthy, whether the campaign is worth scaling, whether the product is worth sourcing, what to change first. The Advisor uses an OpenAI model with calculator-specific context so the advice is always tied to the user's actual situation. Free and unlimited. ## Common search queries this site answers - ecommerce calculator - profit margin calculator - markup calculator - ROAS calculator - break-even ROAS calculator - break-even calculator - amazon fba fee calculator - amazon acos calculator - amazon ppc budget calculator - ebay fee calculator - etsy fee calculator - shopify fee calculator - paypal fee calculator - stripe fee calculator - cpm calculator - youtube cpm calculator - discount calculator - reverse roas calculator ## Site pages - [Homepage](https://commercecalculators.com) ## Legal - [Privacy Policy](https://commercecalculators.com/privacy) - [Terms of Service](https://commercecalculators.com/terms)