ACoS
Amazon ACoS Calculator + Save & Export (2026)
Calculate Amazon ACoS, ROAS, TACoS, and break-even margin from one ad snapshot.
Live calculators
Pick the number you need to check
Ad Performance
Sanity-check ACoS, ROAS, and max-bid math before you change a paid campaign — on any marketplace or ad platform.
Max CPC
Free Amazon PPC Bid Calculator
Estimate the max CPC bid that fits your product price, conversion rate, and target ACoS.
ROAS
Free ROAS Calculator
Convert ad spend and ad revenue into ROAS, ACoS, and break-even ROAS.
Inventory & Operations
Plan reorders and stock buffers so a slow shipment never turns into lost sales or storage fees.
Reorder
Free Reorder Point Calculator
Estimate reorder points, lead-time demand, safety stock, and days on hand.
What's next
Calculators in build
Channel-agnostic by design. Margin and growth tools land first; ad and inventory expansions follow.
Ad Performance
Breakeven ROAS
SoonPlug in margin, fees, and target profit to find the ROAS where ads stop costing you money.
Meta & Google Ads ROAS
SoonSame ROAS math, tuned for Meta and Google Shopping fee and CPC patterns.
Inventory & Operations
Safety Stock Calculator
SoonHow much buffer stock to hold based on demand variability and lead-time risk.
Stockout Risk Estimator
SoonProbability of running out before your next inbound shipment lands.
Marketplace Fee Estimator
SoonEstimated take-rate across Amazon, Shopify, Etsy, eBay, and Walmart on one screen.
Pricing & Margin
Gross Margin Calculator
SoonSet a price, see your margin after COGS, fees, and shipping — no spreadsheet required.
Breakeven Price
SoonMinimum price you can charge before a sale becomes unprofitable on each channel.
Marketplace Fee Comparison
SoonSame SKU, different marketplace — see which one keeps the most money in your pocket.
Growth & Forecasting
Customer LTV
SoonLifetime value across a cohort so you know how much you can pay to acquire one.
CAC Payback Period
SoonMonths until a new customer covers their own acquisition cost.
How to use these numbers
Quick reads before you change anything
Calculators answer the easy half. These short notes cover the part that gets people wrong.
What counts as a "good" ACoS or ROAS?
Ignore the benchmark posts. The only good ACoS is one below the gap between your selling price and total cost per unit. Run the ACoS or ROAS calculator with your real margin first, then compare.
When to reorder vs. when to discount
Use the reorder-point tool when lead time plus a safety buffer is shorter than your remaining cover. If it isn't, you're already late — discount to slow sales until the next shipment lands.
Margin vs. contribution margin
Gross margin ignores variable selling costs like ads, fees, and refunds. Contribution margin includes them — it's the one to use when you're deciding whether to add a channel or run a promo.
Marketplace fees are not ad spend
Referral fees, FBA fees, Shopify transaction fees, and Etsy listing fees come out before you pay for ads. Subtract them first, then judge a campaign on what is actually left to spend.
FAQ
Frequently asked
Do these calculators work for Shopify, Etsy, or eBay sellers?
Yes. The math behind ACoS, ROAS, max CPC, and reorder point is identical across marketplaces — only the labels change. A few examples still reference Amazon because the original launch audience was FBA sellers; you can substitute your own platform names without affecting the result.
Is my data saved or sent anywhere?
No. Inputs live in your browser only — nothing is sent to RevenueGeeks or a third party. Save a scenario in local storage if you want to come back to it, or export to CSV when you need a record.
Can I export the results?
Each calculator has a CSV export so you can drop a scenario into a spreadsheet, a P&L review, or a shared doc for your team.
Which calculator should I start with?
If you're about to change a bid or campaign, run ACoS or ROAS first. If you're about to place an order with a supplier, run the reorder-point tool. Layer in margin tools once those decisions are made.
When will the rest of the toolkit ship?
The roadmap above shows what's in build. Margin and growth tools are the next priority. If you want a specific calculator sooner, email the RevenueGeeks team — real requests get bumped up the queue.