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ACoS, break-even ACoS, TACoS, profit and PPC budget calculators, plus title and backend keyword checkers built for the 2026 rules. Free, no signup, nothing stored.
Enter your ad spend and ad-attributed sales to get ACoS and ROAS. Add total sales to see TACoS too.
Open tool Break-even ACoS calculatorYour break-even ACoS is your profit margin before advertising. Enter your numbers per unit to find it, then set a target that keeps profit.
Open tool TACoS calculatorTACoS shows how much of your total revenue goes to advertising, and whether ads are lifting organic sales.
Open tool Amazon profit calculatorSee what each sale really earns after product cost, Amazon fees, other costs and advertising.
Open tool PPC budget calculatorWork backwards from the orders you want: clicks needed, the daily budget to buy them and the ACoS that budget implies.
Open tool Title character counterPaste a title to check it against the 2026 rules: 75 characters including spaces, no banned special characters, no word more than twice.
Open tool Backend keywords checkerPaste your Search Terms (generic keyword) field. We count bytes, remove repeats and punctuation, and give you a clean version to paste back.
Open toolShare or embed: link to any tool page. If you write about Amazon advertising, you are welcome to link to these calculators as a resource.
Which tool, when
The tools are built to be used in sequence. Each answers one question a strategist gets asked on a call.
Checking whether ads make money
Start with the ACoS calculator for the ratio, then the break-even ACoS calculator for the line it has to stay under. If ACoS is above break-even, the campaign is buying sales at a loss.
Setting next month's ad budget
Use the PPC budget calculator with your sales target and the ACoS you can afford, and sanity-check the answer against the profit calculator so budget never exceeds margin.
Pricing a new product
Run the profit calculator with the landed cost, referral fee and FBA fee to see the margin before ads, then the break-even ACoS calculator to see how much of that margin ads can take.
Writing or fixing a listing
The title character counter checks length against the current category rules, and the backend keywords checker finds duplicates, banned terms and wasted bytes in the search terms field.
The numbers behind them
Five definitions that every calculator, and every PPC Spider plan, is built on.
ACoS
Advertising cost of sale: ad spend divided by ad-attributed sales. The ratio Amazon reports, and the one most sellers watch first.
TACoS
Total advertising cost of sale: ad spend divided by all sales, paid and organic. It shows whether advertising is lifting the whole business or only the ads column.
Break-even ACoS
The profit margin left after product cost and marketplace fees. An ACoS at this level means the ad sale made nothing; above it, the sale lost money.
Net margin per unit
Price minus landed cost, referral fee, FBA fee, storage and returns. The number every bid should be judged against.
Profit-capped ACoS
The ACoS target set from net margin and the profit you want to keep per unit. It is how SpiderOS sets the ceiling on every bid.
What they cannot tell you
- The calculators use the fee structures published by the marketplaces and the figures you enter. Fees change, sometimes mid-year; check the current fee schedule in Seller Central before deciding on price.
- Results are estimates for planning, not accounting. Storage, returns, promotions and currency conversion vary by product and month.
- Nothing you type is stored or sent anywhere. Each tool runs entirely in your browser, which also means a refresh clears it.
Tool questions
Are the tools really free?
Yes. No signup, no email gate, no limit on use. They exist because sellers kept asking us the same questions on calls.
Can I link to or embed a calculator?
Link to any tool page freely. If you want to embed one in your own site or training material, email admin@ppcspider.com and we will send an embed snippet.
How current are the fee assumptions?
We update the calculators when Amazon publishes a fee change and note the effective date on the tool page. If you spot a mismatch with your fee preview in Seller Central, tell us and we will fix it.
Do the tools work for Walmart or other marketplaces?
The ACoS, TACoS, break-even and budget calculators are platform-neutral: enter the fee structure for the marketplace you sell on. The title and backend keyword checkers follow Amazon's rules.
What is the difference between these tools and SpiderOS?
The tools answer one question at a time from numbers you type in. SpiderOS connects to the account and does the same math per ASIN, per day, from live data, then acts on it.
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- Where profit is leaking, in plain numbers
- Which plan fits, with no obligation
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