ToolHub

ACOS Calculator

Calculate your Amazon ACOS, ROAS, and break-even ACOS instantly. Free tool for Amazon sellers to measure ad efficiency and profitability.

Ad Spend
$
Ad Revenue
$
Profit Margin
optional
%

How to Use

  1. 1 Enter your total Ad Spend — the amount you paid for Amazon ads.
  2. 2 Enter your Ad Revenue — the total sales generated from those ads.
  3. 3 Optionally enter your Profit Margin (%) to calculate break-even ACOS and see if ads are profitable.
  4. 4 Click Calculate to instantly see your ACOS, ROAS, and profitability status.

Use Cases

Evaluate Campaign Profitability

Compare your ACOS against your profit margin to instantly know whether your ad spend is generating profit or burning money.

Set Bidding Targets

Use your break-even ACOS as the ceiling for your bids. Any ACOS below that number means your campaigns are profitable.

Report Ad Performance

Quickly convert raw ad spend and revenue numbers into ACOS and ROAS metrics for weekly or monthly performance reports.

Optimize Product Listings

Track ACOS across different products to identify which listings convert well and deserve more ad budget.

FAQ

ACOS (Advertising Cost of Sale) is the percentage of ad revenue spent on advertising. Formula — ACOS = Ad Spend ÷ Ad Revenue × 100%. A lower ACOS means your ads are more efficient.

A "good" ACOS depends on your profit margin. As a rule of thumb, your ACOS should be below your profit margin to run profitable ads. Many sellers target 15–30% ACOS, but the right number varies by product and strategy.

Break-even ACOS equals your profit margin percentage. If your margin is 30%, an ACOS of 30% means ads are breaking even — you're not losing money, but not making extra profit either. Above that, ads cost more than they earn.

ROAS (Return on Ad Spend) is the inverse of ACOS expressed as a multiplier. ROAS = Ad Revenue ÷ Ad Spend. If ACOS is 25%, ROAS is 4× — meaning every $1 spent on ads returns $4 in revenue.

No. All calculations happen instantly in your browser. No data is sent to any server.

Related Tools

A/B Test Calculator

Check if your A/B test results are statistically significant. Calculates p-value, Z-score, uplift, and statistical power. Free.

Open →

A/B Test Sample Size Calculator

Calculate the sample size needed per variation for a statistically valid A/B test. Set confidence level, power, baseline rate and MDE. Free.

Open →

Ad Revenue Calculator

Calculate your estimated ad revenue from pageviews or clicks. Free tool for bloggers and publishers using RPM or CPC models. No signup needed.

Open →