TACoS Calculator: Total Ad Spend as a Share of Total Sales, in Rupees

TACoS, total advertising cost of sale, is your ad spend divided by your total sales for the same period, multiplied by 100. Total sales means everything you sold, whether an ad drove it or not. If you spent ₹20,000 on ads and sold ₹2,00,000 in total, TACoS is 10%. Amazon's ACOS guide defines ACOS as ad spend ÷ ad revenue × 100 and does not mention TACoS, so TACoS is a seller-side measure you calculate yourself. The calculator below does it.

What do I enter, and where do I find it?

You need three figures for the same period (a week, a month, or a campaign window), all on the same basis.

• Ad spend (₹): the total cost from your ads reports. Count every ad type you run on that marketplace.
• Ad sales (₹): sales attributed to ads. Amazon defines sales in its Sponsored Products guide as the total value of products sold attributed to your ads.
• Total sales (₹): from your business report or settlement, not the ads console. Use ordered or shipped sales consistently.
• Break-even profit margin (%), optional: your profit before ads as a share of sales. Work it out with the ROAS and break-even calculator.

The defaults are placeholders, not benchmarks. Replace them.

How is TACoS calculated?

TACoS = ad spend ÷ total sales × 100. With the defaults: ₹20,000 ÷ ₹2,00,000 × 100 = 10%.

Compare it with the two ratios Amazon does define. ACOS is ad spend ÷ ad revenue × 100, and ROAS is ad revenue ÷ ad spend, which Amazon calls the inverse of ACOS. Amazon's ROAS guide gives the same ad revenue ÷ ad spend formula. In the example, ad sales are ₹1,00,000, so ACoS is 20% and ROAS is 5. TACoS is 10% because the same ₹20,000 is set against twice as many sales. Only the denominator changes. For the long version of how the three differ, read ACOS vs TACoS vs ROAS, or the glossary entries for ACOS, ROAS and TACoS.

What does the break-even TACoS line mean?

If your profit before ads is 25% of sales, you can spend up to 25% of total sales on ads before you make nothing. That is the break-even TACoS. It equals your margin before ads, because both are shares of the same total sales. A TACoS of 10% against a 25% margin leaves 15% of sales as profit after ads, before overheads. The margin you enter should be after GST, product cost, marketplace fees and shipping.

This is the account-level cousin of break-even ROAS. Break-even ROAS tells you whether one ad sale pays. Break-even TACoS tells you whether the whole ad budget is affordable for the whole business.

How do I read a TACoS trend?

One month's TACoS tells you little. The direction against total sales tells you more.

These are readings to investigate, not rules. Causes outside ads, such as a sale event, a price change or stock-outs, can move TACoS on their own. During a big sale, total sales spike and TACoS drops without any change in ad efficiency.

What does TACoS leave out?

• Attribution. TACoS does not say which sales the ads caused. Ad-attributed sales are Amazon's definition of ad sales, and organic sales are the rest. Amazon's campaign reporting page lists ROAS, ACOS and sales but states no default attribution window.
• Margin. A 10% TACoS is excellent on a 40% margin and ruinous on an 8% margin.
• Product mix. One bestseller can hide several loss-making SKUs. Run it per product group too.
• Other channels. Include only ad spend and sales from the marketplace you are measuring, unless you want a blended figure.

FAQ

What is TACoS in Amazon advertising? TACoS is total advertising cost of sale: ad spend divided by total sales, ad-driven plus organic, times 100. Amazon's ACOS guide does not define it, so it is a metric sellers and tools calculate themselves.

What is the difference between ACoS and TACoS? ACoS divides ad spend by sales attributed to ads. TACoS divides the same spend by all sales. Because total sales are at least as large as ad sales, TACoS is never higher than ACoS. ACoS judges campaigns; TACoS judges the account.

What is a good TACoS? It depends on your margin and stage. We found no marketplace-published benchmark, and vendor figures vary, so we do not give one. Compare TACoS with your break-even TACoS: it must sit below your margin before ads, with room for overheads.

Can I calculate TACoS for Flipkart? Yes. The formula is the same: Flipkart ad spend divided by total Flipkart sales. Flipkart's reports name metrics differently, so check which of your reports shows ad spend and which shows total sales for the same dates.

Should total sales include GST? Use the same basis as the ad sales and ad spend figures. Whether your ad report includes GST is something we could not confirm from public Amazon pages, so check one order in your report. A mismatch of 18% distorts every ratio.

How often should I check TACoS? Weekly for movement, monthly for decisions. Daily figures swing with sale days, delivery delays and the way sales are booked, so a single bad day is rarely a reason to change bids.

Next step

If TACoS is moving the wrong way and you want someone to read it with your listings and ads together, Blooprint can do that through its catalogue and listing optimisation and ads management work. Its software BlooprintAI automates ad changes once the targets are set.