How to use this TACoS calculator
TACoS is total advertising cost of sale: ad spend divided by total revenue, organic included. Enter three numbers from the same date range: ad spend, ad sales, and total sales. Add gross margin and the calculator also shows break-even TACoS and the share of profit ads consume.
- Pull all three figures from the same date range, or the ratio lies to you.
- Use 30-60 day windows. Single weeks swing too hard to read.
- Margin turns the readout into profit guardrails: efficient, ad-heavy, or losing money.
What TACoS tells you that ACoS cannot
ACoS grades a campaign; TACoS grades the business. A campaign can hit a 22% ACoS while ads quietly grow to half your revenue, and ACoS will never flag it. TACoS divides the same spend by total sales, so it exposes ad dependency and organic strength in one number.
Metric | ACoS | TACoS |
|---|---|---|
Formula | Ad spend ÷ ad sales | Ad spend ÷ total sales |
Question it answers | Is this campaign efficient? | Is the business ad-dependent? |
Moves when | Bids, CPC, or conversion change | Organic rank rises or falls |
What a healthy TACoS looks like
There is no universal good TACoS; the honest benchmark is your own margin. Ads eat all gross profit when TACoS equals margin, so a 35% margin makes 35% the break-even line. Staying under half of margin, 17.5% in that case, leaves real profit after every other cost.
Context still matters. A launch runs hot on purpose because ads are buying rank, reviews, and data. A mature listing coasting on organic rank should trend down quarter over quarter. Judge the direction against the product's age, not against another seller's number.
Worked example: $2,200 spend on $18,000 total sales
Say ads cost you $2,200 this month and drove $10,000 of your $18,000 in total sales. TACoS is 12.2%, ACoS is 22%, and organic still carries 44.4% of revenue. On a 35% margin, gross profit is $6,300, ads consume 34.9% of it, and $4,100 remains.
- Verdict at these numbers: efficient. TACoS sits well under half of the 35% margin.
- If spend doubled and sales stayed flat, TACoS would hit 24.4% and profit would drop to $1,900.
- The same $2,200 against $30,000 of total sales would be a 7.3% TACoS. Growing the denominator is the quiet win.
How to lower TACoS without starving growth
Cutting spend is the crude way to lower TACoS, and it often backfires by surrendering rank. The durable lever is the denominator: grow organic sales so the same ad budget shrinks as a share of revenue. Aim spend cuts at search terms with 20 or more clicks and zero orders.
- Harvest converting search terms into exact-match campaigns and cut the bleeders.
- Shift budget from defensive branded ads toward keywords that win new customers.
- Improve listing conversion: better images and price tests raise organic sales at zero ad cost.
- Track the 90-day trend. One noisy week is weather; a quarter is climate.
Frequently Asked Questions
What is TACoS on Amazon?
TACoS is ad spend divided by total sales, organic included, times 100. A $2,200 spend against $18,000 of total sales is a 12.2% TACoS.
How is TACoS different from ACoS?
ACoS divides spend by ad sales only; TACoS divides by all sales. ACoS measures campaign efficiency, while TACoS measures how ad-dependent the whole business is.
What is a good TACoS?
Under half your gross margin is a comfortable working target. At a 35% margin that means staying below 17.5%, with 35% as the break-even ceiling.
Is a rising TACoS always bad?
No. Rising TACoS during a launch usually means ads are buying rank on schedule. It turns bad when a mature product's TACoS climbs while total sales stay flat.
Is a falling TACoS always good?
Not always. It can signal underinvestment. If TACoS falls while competitors take your shelf share, you saved pennies and lost position.
What does a high TACoS with flat sales mean?
Ads are replacing organic sales instead of adding to them. Check organic rank and listing conversion before raising budgets further.
Should I include DSP and external ads in TACoS?
Include every ad dollar aimed at Amazon sales for a true dependency read. Whatever you include, keep the definition identical period to period or the trend stops meaning anything.
What date range should I use for TACoS?
A 30-60 day window works best. A single week swings with deals and stockouts; a full quarter smooths signal you may want to see sooner.