Free Amazon & Meta Ads Calculators
Free calculators for Amazon brands that also run Meta ads. Each one gives you a number in under a minute: the ROAS your ads need to break even, how big a holdout test needs to be, what your ads really caused, how far Meta and Amazon Attribution are from it, and which channel keeps more of each order.
They start with example values for a small supplement brand, so you see a result straight away. Change any number and the result updates. Every calculator shows its formula and a worked example, and the link in your address bar saves your inputs, so you can share the result with a partner or your agency. No signup.
They're estimates. To measure the sales your Meta ads actually cause on Amazon, see how lift is calculated.
Incrementality & attribution
What your Meta ads really cause on Amazon, and how far each report's credit is from that.
- Holdout Test Sample Size CalculatorHow big a lift your geo holdout test can detect, and how long it needs.Open calculator →
- Incremental ROAS CalculatorTurn holdout test results into incremental sales and iROAS.Open calculator →
- Meta → Amazon Halo Effect CalculatorAmazon sales your Meta ads cause that Amazon Attribution never credits.Open calculator →
- Attribution Gap CalculatorMeta's reported revenue vs. Amazon Attribution vs. what your ads really caused.Open calculator →
- Facebook Ads ROI Calculator for AmazonReported ROAS, cost per order and profit from Amazon Attribution, with labeled what-if scenarios.Open calculator →
- Brand Referral Bonus CalculatorYour Amazon Brand Referral Bonus, effective ad cost and ROAS with the bonus.Open calculator →
Profitability
What a sale is worth after Amazon fees, product costs and ads.
- Product Margin CalculatorProfit margin and markup from cost and price, or the price for a target margin.Open calculator →
- Amazon Profit CalculatorProfit per unit and per month after Amazon fees, product cost and ads.Open calculator →
- ACoS CalculatorAmazon ACoS, ROAS and TACoS from your ad report, checked against your break-even.Open calculator →
- TACoS & Blended ROAS CalculatorAmazon TACoS, blended TACoS and blended ROAS across all your ad spend.Open calculator →
- Break-Even ROAS & ACoS CalculatorThe ROAS and ACoS where your ads stop losing money, from your unit costs.Open calculator →
- Amazon FBA Fee CalculatorReferral, FBA fulfillment and surcharge fees per unit from Amazon's 2026 rate cards.Open calculator →
- Contribution Margin by Channel CalculatorProfit per order on Amazon vs. Shopify, side by side.Open calculator →
- Marginal ROAS CalculatorWhat your next ad dollar returns, from your own spend and revenue history.Open calculator →
LTV & retention
What a customer is worth over time, and how much you can spend to get one.
- Product Sampling ROI & LTV CalculatorWhether free samples pay back once sampled customers buy full-size.Open calculator →
- Amazon Subscribe & Save LTV CalculatorWhat a Subscribe & Save customer is worth after the discount and churn.Open calculator →
- CAC Payback Period CalculatorHow many orders and days until a new customer pays back what you spent.Open calculator →
- Max Allowable CAC CalculatorThe most you can spend to win a customer, by LTV ratio and payback window.Open calculator →
Planning
Budgets, launches and inventory, worked out before you spend.
- Ad Budget Allocator: Meta vs. Amazon AdsSplit one budget between Meta and Amazon Ads by what each really returns.Open calculator →
- Amazon Product Launch Traffic CalculatorThe sessions, clicks and Meta budget a launch sales target needs.Open calculator →
- Amazon Reorder Point & Ad Pacing CalculatorDays of stock left, how soon to reorder and how hard you can push ads.Open calculator →