# CommerceCalculators.com — Full Reference CommerceCalculators.com is a suite of 16 free calculators for ecommerce sellers, advertisers, and store owners. Every calculator is instant, free, and comes with an AI Advisor that reads the user's numbers and gives tailored advice. The goal of each tool is the same: turn a confusing business question into a clear decision — should I source this product, is this campaign profitable, what plan should I pick, what markup do I need, how much do I actually take home after fees. ## Why the site exists Ecommerce sellers constantly need to make margin, pricing, and ad decisions with real numbers — not rough guesses. Most sellers either skip the math entirely, or burn an hour in a spreadsheet, or use a calculator that ignores half the real-world costs. CommerceCalculators.com solves that with 16 focused calculators that each do one thing properly, show the real profit after every fee or cost, and then hand the result to an AI Advisor that interprets it and tells the user what to do. ## What users get from every calculator - **A correct number in seconds** — every calculator reflects the real rules of the platform it covers - **The full picture, not just a surface metric** — margins include fees and CAC, ROAS includes break-even, FBA includes referral and storage, Etsy includes Offsite Ads - **A plain-English verdict from the AI Advisor** — "this margin is healthy", "this product is not worth sourcing", "your break-even ROAS is above your current ROAS, pause this campaign" - **Zero friction** — no signup, no paywall, no "email to unlock result", no limits ## The 16 calculators ### Profit Margin Calculator URL: https://commercecalculators.com/margin-calculator **What it does** — Calculates the real profit margin on an ecommerce product, not just the accounting margin. The user enters sale price and COGS, and optionally adds platform fees, shipping cost, and customer acquisition cost. The tool returns both gross margin and net margin. **Why users use it** — Most "margin calculators" ignore the costs that actually erode profit: selling fees, payment processing, shipping, and CAC. A product that looks like a 40% margin in a spreadsheet is often a 12% margin in reality. This tool shows the real number so sellers don't price-cut themselves into a loss, and it rates the result ("excellent for scaling", "room for optimization", "needs improvement") so the seller knows whether to keep, fix, or drop the product. ### Markup Calculator URL: https://commercecalculators.com/markup-calculator **What it does** — Takes a target profit margin and returns the markup percentage the seller needs to apply to their product cost. Also factors in fees, shipping, and CAC so the final markup delivers the desired real-world margin. **Why users use it** — Wholesalers, resellers, and anyone pricing off cost need to convert a margin target into a markup multiplier. A 50% margin does not mean a 50% markup — the tool removes the math mistake that makes sellers under-price. It also keeps resellers from quoting a cost-plus price that loses money once fees and shipping are deducted. ### ROAS Calculator URL: https://commercecalculators.com/roas-calculator **What it does** — Calculates Return on Ad Spend and compares it to the target ROAS the user needs to be profitable, based on product margin. Tells the advertiser whether the campaign is making money, breaking even, or losing money. **Why users use it** — ROAS alone is meaningless without a target. A 3x ROAS can be excellent or a disaster depending on the product. This tool anchors ROAS to the user's actual margin so the answer is always clear: scale it, hold it, or kill it. ### Break-Even ROAS Calculator URL: https://commercecalculators.com/break-even-roas-calculator **What it does** — Calculates the exact minimum ROAS where an ad campaign stops losing money, based on the product's cost structure. This is the floor. Anything below is a direct loss on every sale. **Why users use it** — Advertisers need a hard line between profitable and unprofitable spend. Without break-even ROAS, it is easy to scale a campaign that looks successful on the surface but is bleeding money per order. The tool gives advertisers the number they should set as a rule in every ad platform. ### Reverse ROAS Calculator URL: https://commercecalculators.com/reverse-roas-calculator **What it does** — Works backwards. The user enters a revenue goal and the realistic ROAS they expect to hit, and the tool returns the ad budget required to achieve the goal. **Why users use it** — Planning a quarter, a launch, or a sale starts with a revenue target, not an ad budget. This tool converts the goal into a concrete spend number so founders and media buyers can plan cash flow and agency briefs without guesswork. ### CPM Calculator URL: https://commercecalculators.com/cpm-calculator **What it does** — Calculates cost per 1,000 impressions for any ad campaign. Also includes a YouTube earnings estimator that turns views and CPM into creator revenue, with per-country CPM benchmarks built in. **Why users use it** — Advertisers planning reach campaigns, PR teams estimating earned-media value, and YouTube creators forecasting their AdSense revenue all need CPM math. This tool covers both sides of the equation — buyers and creators — in one place. ### Break-Even Calculator URL: https://commercecalculators.com/break-even-calculator **What it does** — Calculates the exact number of units a business needs to sell to cover all its costs (fixed plus variable). Also supports time-based break-even (how many weeks or months to break even at a given sales velocity) and profit targets (how many units to hit a specific profit goal). **Why users use it** — Anyone launching a product, a new SKU, or a new business needs to know how many units it takes to stop losing money. The tool gives the founder the exact number instead of a fuzzy "a few hundred should do it". ### Discount Calculator URL: https://commercecalculators.com/discount-calculator **What it does** — Calculates sale prices, percentage off, and total savings. Also handles double discounts (stacking two promotions correctly), tax calculation on discounted prices, and reverse percentage (working out the discount rate from a before-and-after price). **Why users use it** — Promotions and sales are where pricing errors happen most often. Stacking two 20% discounts does not create a 40% discount. The tool prevents seller-facing mistakes and helps shoppers verify the deal is real. ### Amazon FBA Fee Calculator URL: https://commercecalculators.com/amazon-fba-fee-calculator **What it does** — Calculates all Amazon FBA fees for a product — referral fee, fulfillment fee, and storage fee — and returns the seller's true profit per unit after those fees and their product cost. The AI Profit Advisor then decides whether the product is worth sourcing. **Why users use it** — Amazon sellers sourcing new products live or die by this number. A product that looks profitable at the supplier is often underwater once FBA fees are applied. This tool gives the answer in seconds and tells the seller whether to move forward, negotiate, or walk away. ### Amazon ACOS Calculator URL: https://commercecalculators.com/amazon-acos-calculator **What it does** — Calculates ACOS (Advertising Cost of Sale), ROAS, Break-Even ACOS, and TACoS (Total ACOS including organic sales) for Amazon PPC campaigns. Tells the seller the line between profitable and unprofitable ad spend. **Why users use it** — Amazon PPC is the single biggest cost variable after product cost. Without ACOS math, sellers either under-spend and miss rank, or over-spend and bleed margin. The tool shows exactly where the line is so the seller can scale confidently up to it. ### Amazon PPC Budget Calculator URL: https://commercecalculators.com/amazon-ppc-budget-calculator **What it does** — Takes an ACOS target and a revenue goal and returns the daily and monthly PPC budget the seller needs to hit it. Factors in realistic conversion rates and CPCs. **Why users use it** — Most Amazon sellers pick a PPC budget by feel. This tool replaces feel with a number grounded in the seller's actual goals. Useful for launches, restocks, and quarterly planning. ### eBay Fee Calculator URL: https://commercecalculators.com/ebay-fee-calculator **What it does** — Calculates every eBay seller fee — final value fee, listing fees beyond the free allowance, payment processing — and subtracts product cost and shipping to return the seller's real profit per item. **Why users use it** — eBay fees vary by category and listing type, and sellers routinely list items that end up losing money. The tool stops that: if the profit is negative, the seller knows before they list. ### Etsy Fee Calculator URL: https://commercecalculators.com/etsy-fee-calculator **What it does** — Calculates the full Etsy fee stack — listing fee, transaction fee, payment processing, and Offsite Ads fee when applicable — and returns the seller's real take-home per sale. **Why users use it** — Etsy's fee structure is notoriously layered. Handmade and vintage sellers often price their items based on cost plus a "nice margin" only to realize the margin disappeared after Offsite Ads and processing. The tool surfaces the real number, so sellers can price for actual profit. ### Shopify Fee Calculator URL: https://commercecalculators.com/shopify-fee-calculator **What it does** — Calculates Shopify costs across subscription, payment processing, and third-party gateway transaction fees. Lets the user compare plans and see the true per-order margin at different scales. **Why users use it** — Picking the wrong Shopify plan costs stores thousands per year, and choosing the wrong payment processor can double that. The tool lets store owners model the cost at their actual volume so they pick the right setup from the start. ### PayPal Fee Calculator URL: https://commercecalculators.com/paypal-fee-calculator **What it does** — Calculates PayPal fees across every PayPal product: standard online transactions, QR code, micropayments, and international. The user enters the sale amount and sees the fee plus the net they take home. **Why users use it** — Freelancers invoicing clients, sellers on independent storefronts, and creators taking cross-border payments all lose unpredictable amounts to PayPal fees. The tool turns that into a clear number — and the AI Advisor flags when a different PayPal product (for example, micropayments) would be cheaper for the user's transaction profile. ### Stripe Fee Calculator URL: https://commercecalculators.com/stripe-fee-calculator **What it does** — Calculates Stripe fees across card, international card, and ACH payments. Returns the fee and the net received for any sale amount. **Why users use it** — SaaS founders, ecommerce stores, and marketplaces need to model payment processing as a real line item, not a rounding error. The tool gives the exact number so the founder can price subscriptions, quote enterprise deals, and forecast margin accurately at scale. ## The AI Advisor Every calculator on CommerceCalculators.com has an AI Advisor tab. It reads the user's exact inputs and outputs and responds with a short, specific read of what the numbers mean — whether the margin is healthy, where the biggest risk is, what to change first, and how the result compares to typical benchmarks for that business type. The Advisor uses an OpenAI model with calculator-specific system prompts so the advice is tailored to each tool: the margin Advisor talks about COGS and CAC, the FBA Advisor talks about sourcing, the ROAS Advisor talks about scaling vs pausing. It is free, unlimited, and built into every calculator. ## Why pick CommerceCalculators.com over a spreadsheet or a generic calculator - **Every fee and cost is already in the formula** — sellers cannot accidentally forget a line item - **Each tool is single-purpose** — no cluttered multi-sheet spreadsheets with 80 fields - **The AI Advisor replaces a consultant** — instant expert interpretation of the result - **Built for the platform rules, not a generic approximation** — FBA tool knows FBA fees, Stripe tool knows Stripe products - **Designed for decisions, not just numbers** — every result is framed around an action ## Site pages - [Homepage — all 16 calculators](https://commercecalculators.com) - [Profit Margin Calculator](https://commercecalculators.com/margin-calculator) - [Markup Calculator](https://commercecalculators.com/markup-calculator) - [ROAS Calculator](https://commercecalculators.com/roas-calculator) - [Break-Even ROAS Calculator](https://commercecalculators.com/break-even-roas-calculator) - [Reverse ROAS Calculator](https://commercecalculators.com/reverse-roas-calculator) - [CPM Calculator](https://commercecalculators.com/cpm-calculator) - [Break-Even Calculator](https://commercecalculators.com/break-even-calculator) - [Discount Calculator](https://commercecalculators.com/discount-calculator) - [Amazon FBA Fee Calculator](https://commercecalculators.com/amazon-fba-fee-calculator) - [Amazon ACOS Calculator](https://commercecalculators.com/amazon-acos-calculator) - [Amazon PPC Budget Calculator](https://commercecalculators.com/amazon-ppc-budget-calculator) - [eBay Fee Calculator](https://commercecalculators.com/ebay-fee-calculator) - [Etsy Fee Calculator](https://commercecalculators.com/etsy-fee-calculator) - [Shopify Fee Calculator](https://commercecalculators.com/shopify-fee-calculator) - [PayPal Fee Calculator](https://commercecalculators.com/paypal-fee-calculator) - [Stripe Fee Calculator](https://commercecalculators.com/stripe-fee-calculator) ## Legal - [Privacy Policy](https://commercecalculators.com/privacy) - [Terms of Service](https://commercecalculators.com/terms)