ACOS and TACOS Calculator

How to Use the ACOS and TACOS Calculator

The ACOS and TACOS calculator turns three amounts into the three most important advertising metrics. You do not need to install anything or create an account—just enter your data and see the result right away.

The tool has three amount fields:

• Ad spend — defaults to 150. This is the amount spent on campaigns in the selected period.
• Ad revenue — defaults to 600. This is the sales attributed to ad campaigns.
• Total revenue — defaults to 1000. This is all sales in the same period, including sales that came without ads.

After you enter your own values, you will see ACOS, TACOS, and ROAS. Enter amounts in the platform currency, and the default is US dollars ($). You can use any currency, though—the metrics are percentages and ratios, so their meaning does not depend on the currency. Just make sure all three amounts are in the same currency.

For the default values, the tool shows: ACOS 25.00%, TACOS 15.00%, and ROAS 4×. Step by step: ACOS = 150 ÷ 600 × 100% = 25.00%, TACOS = 150 ÷ 1000 × 100% = 15.00%, ROAS = 600 ÷ 150 = 4×. Calculations run locally in your browser, and your numbers are never sent anywhere.

Where to Find Ad Spend and Revenue in Amazon Ads

For the result to make sense, all three numbers must cover the same period and the same currency. It is easiest to work with one range, such as the last 30 days or a full month.

• Ad spend — you will find it in the campaign summary in the advertising console. This is the amount you were actually charged for ad impressions and clicks during the period.
• Ad revenue — this is sales attributed to campaigns, meaning sales the platform ties to your ads. You can see it in campaign reports as ad sales.
• Total revenue — this is all sales in your store during the same period, including orders that came without ads. Use a sales report or business report.

Watch for consistency: if you take spend from sponsored campaigns, total revenue should also cover the same sales channel and the same period. Otherwise, you are comparing two different realities and the metrics stop being comparable.

Want to check several campaigns separately? Repeat the calculation for each one. You can also compare month to month—just enter data from the period you choose and save the results yourself, for example in a spreadsheet.

How to Interpret ACOS, TACOS, and ROAS

Each of the three metrics answers a different question. They are easy to confuse, so it helps to stick to simple definitions.

ACOS is an ads-focused metric. The higher it is, the larger the share of ad sales that goes back to the platform as ad spend. The lower it is, the more stays on the seller's side.

TACOS looks wider—at the whole business. It shows what share of total company revenue ads consume. It is usually lower than ACOS because its denominator is all sales, not just ad sales. In our example, ACOS is 25.00% and TACOS is only 15.00%, because some revenue came without ads.

ROAS is the inverse of ACOS shown another way: how much ad revenue each unit of spend generated. A value of 4× means that for every unit spent on ads, the platform attributes four units of ad revenue. This is still not profit—it is revenue.

How to Use TACOS to Assess Ad Impact on Your Whole Business

ACOS is about campaigns; TACOS is about the company. That is why TACOS is a convenient metric to track over time, especially when some sales come organically.

1. Record TACOS for consecutive periods. A single reading says little—only several points in time show the direction.
2. Compare periods of similar length. Week to week, month to month. Mixing short and long ranges blurs the picture, because a single strong campaign can distort the result over a short period.
3. Compare TACOS with your sales scale. What matters is not only whether the metric falls, but also whether total revenue rises. Falling TACOS with rising sales is usually a good sign. Falling TACOS with flat sales may mean you are simply winding down your ads.
4. Watch the relationship between ACOS and TACOS. When ACOS rises and TACOS stays stable, campaigns cost more, but the business is making up for it with sales outside ads. When both metrics rise, ads are starting to weigh on total revenue.
5. Treat TACOS as a benchmark for your own decisions. Your margin, product costs, and fixed costs determine what level is acceptable for you. The tool provides the metric; you set the threshold.

This rhythm—calculate, record, compare after several periods—gives you more than checking metrics once after every campaign day.

Limitations and What the Tool Does Not Calculate (Fees, Returns, Taxes, Profit)

The calculator only calculates metrics based on the three amounts you provide. This is a deliberate simplification, but it is worth knowing where its role ends.

• It does not add platform fees — sales commissions, fulfillment fees, storage fees, or other costs from the platform's fee schedule.
• It does not account for returns or cancellations — it works with the amounts you enter, not sales after adjustments.
• It does not deduct taxes or other government charges.
• It does not know your product cost, shipping costs, or your company's fixed costs.
• It does not calculate profit or margin — ACOS, TACOS, and ROAS are revenue-based metrics, not financial results.
• It includes no rates, thresholds, or limits — it does not judge whether your result is good or compare it with any pricing schedule.

That is why the result is a guide. It is great for a quick look at campaigns and for tracking changes over time, but it does not replace a full profitability calculation. When you want to make budget decisions, combine the metrics with current platform pricing and your own costs—check current rates and terms, because they change independently of this tool.

Also remember that the tool does not import or export files and does not require login credentials. You calculate from raw amounts that you enter yourself, and the calculations stay in your browser.

Frequently Asked Questions

The metrics are estimates; before making decisions, check current Amazon Ads data and platform pricing.