Sooner or later someone will tell you to stop putting ten keywords in a campaign and give each keyword a campaign of its own. It sounds like needless work, and then you see an account run that way and it looks organised in a way yours is not.
The technique is real and the reasoning behind it is sound. It is also frequently adopted at the wrong moment, by sellers whose budgets cannot support it, on keywords that have not earned it.
This guide explains what the structure actually changes, what it costs, and the arithmetic that tells you whether you can afford it yet.
01What is a single keyword campaign?
A single keyword campaign is a campaign that contains one ad group, which contains one keyword. Everything the campaign spends goes to that one keyword. The name is sometimes shortened to SKC.
The alternative, and the way most accounts start, is a campaign holding one ad group with several keywords in it, sharing one daily budget between them.
Both structures advertise the same products to the same shoppers. What differs is which settings you can point at an individual keyword.
02What does moving a keyword into its own campaign actually change?
Some settings belong to the campaign and some belong to the keyword. That split is the whole of this technique. A setting that belongs to the campaign can only be aimed at a single keyword if that keyword is alone in the campaign.
| Setting | Where it is set | What that means for one keyword |
|---|---|---|
| Daily budget | Campaign | Keywords in one campaign compete for the same money |
| Bid | Keyword or target | Already controllable per keyword without splitting |
| Bidding strategy | Campaign | All keywords in the campaign share it |
| Placement adjustments | Campaign | All keywords in the campaign share them |
| Negative keywords | Campaign or ad group | Scope depends on where you add them |
Read the first row before the others. It is the one that matters most to a beginner, and the one most often left out when people explain this technique.
Inside a shared campaign you do not decide how the budget is divided. The auction does. One keyword can absorb most of the day’s money before the others have been served, and the keywords you most wanted to test can go weeks with barely any clicks. Giving a keyword its own campaign is how you take that allocation decision back.
The second reason is placement. Placement adjustments let you bid more for the top of search results than for other positions, but they are set on the campaign, so every keyword inside it gets the same adjustment. If one keyword converts well at the top of search and another does not, a shared campaign cannot express that. Separate campaigns can.
The third reason is reporting. One campaign, one keyword, one row. You stop drilling down through levels to find out what a single term actually did.
Bids are not a reason to split. You can already set a different bid on every keyword inside a shared campaign. The gains here are budget allocation and placement, not bidding.
03Does splitting a campaign give you more data?
No, and this is the most common misunderstanding about the technique.
Your budget buys a certain number of clicks per day. Dividing that budget across ten campaigns does not buy more clicks. The same clicks land in ten places instead of one.
What changes is who decides where they land. In a shared campaign, Amazon’s auction concentrates clicks on whichever keyword wins most often. In separate campaigns, you decide, and each keyword gets the share you funded.
That redistribution helps the keywords that were being starved and hurts the one that was being fed. If a single keyword was quietly carrying the campaign, capping it at its own budget will slow it down. You are buying evenness, and evenness is not free.
04What does the structure cost you?
Four costs, in rough order of how much trouble they cause a small account.
- Every campaign needs its own budget. A campaign with a budget too small to buy meaningful clicks is not a small experiment, it is a stalled one.
- A keyword with little search volume cannot spend what you allocate to it. The money is not overspent, it is stranded, sitting in a campaign that never gets the chance to use it.
- Review time multiplies. Twenty campaigns take longer to check than two, and a structure you stop checking is worse than a simpler one you maintain.
- Account-level patterns get harder to see. A change that affects everything is spread thinly across many rows instead of showing up in one.
05How many single keyword campaigns can you afford?
Work it out from how long each keyword would take to reach a decision. The following figures are illustrative; substitute your own.
A keyword with no sales tells you nothing until it has enough clicks for that silence to be meaningful. At an ad conversion rate of 10%, that point is about 22 clicks.
- Ad budget per day$20.00
- Average CPC$0.80
- Clicks per day, whole account25
- Split across campaigns10
- Budget per campaign$2.00
- Clicks per campaign per day2.5
- Clicks needed to judge one keyword22
- Days until one keyword can be judged9
Now the same money across fewer campaigns.
- Ad budget per day$20.00
- Average CPC$0.80
- Split across campaigns4
- Budget per campaign$5.00
- Clicks per campaign per day6.25
- Clicks needed to judge one keyword22
- Days until one keyword can be judged4
The account buys the same 25 clicks per day in both cases. Across ten campaigns each keyword takes about 9 days to reach a decision; across four it takes about 4 days. Nothing was added and nothing was optimised. The only change was how many ways the same budget was divided.
This is what stops the technique working at small budgets. It is not that many campaigns are forbidden or penalised. It is that dividing a small budget far enough produces campaigns that each take months to say anything, and you pay for every one of those months.
06How do you stop the new campaign competing with the old one?
When you move a keyword into its own campaign and leave the original campaign running, both are now eligible to show for that search term. They are your campaigns, bidding against each other, and the effect is usually a higher cost per click for the same sale.
- Create the new campaign for the keyword and let it start serving.
- Add that exact search term as a negative keyword in the original campaign, so the original stops competing for it.
- Keep both running for several days. A new campaign takes time to start performing, and cutting the old one immediately loses sales during the gap.
- Once the new campaign is serving normally, decide whether the original still has a job to do.
Do this one keyword at a time. Moving twenty at once means twenty simultaneous changes and no way to attribute the result of any of them.
07When is this worth doing, and when is it not?
It is worth doing when all three of these are true: the keyword has already proven it converts; you can give its campaign enough budget to reach a decision in days rather than weeks; and you have a reason to treat it differently, usually a placement or a bid level the rest of the campaign should not share.
It is not worth doing at launch. At launch nothing has proven anything, budgets are smallest, and the structure’s main benefit — protecting proven keywords from each other — has nothing to protect.
Treat it as a promotion, not a starting structure. A keyword earns its own campaign by converting. Sellers who run large accounts this way arrived at it after the keywords were proven, usually with budgets that make the per-campaign arithmetic above trivial.
Frequently asked
Should the keyword be exact match?
Usually, because otherwise the campaign is not really holding one keyword. A phrase or broad match keyword can be matched to many different search terms, so the campaign contains one target and an unknown number of actual terms, and you are back to not knowing where the budget went.
Do I have to delete the original campaign?
No. The usual sequence is to run both for a few days, add the term as a negative keyword in the original so they stop competing, and keep the original doing the job it still does for its remaining keywords.
Is there a limit to how many campaigns I can have?
Amazon publishes limits on the number of campaigns, ad groups and keywords an account can hold. Check the current figures in Amazon’s advertising help pages for your marketplace before planning a structure with hundreds of campaigns. In practice a small account runs into budget arithmetic long before it runs into any published limit.
Does having many campaigns make my account perform worse?
Not in itself. The cost is the four items listed above, and the largest of them is budget fragmentation. A hundred well-funded campaigns are not a problem; ten underfunded ones are.
Final thoughts
The argument for this structure is usually made in terms of control, which is true but vague. The specific control is that budget and placement are campaign settings, so isolating a keyword is the only way to aim them at it.
The argument against is not that the technique is wrong. It is that it moves cost from a place beginners find easy to think about, the campaign, to a place they find hard, the day count needed before any one campaign can tell them anything.
A reader can follow every step here and still end up worse off in one specific way: by splitting a campaign whose budget was already being allocated sensibly. If one keyword was earning most of the sales and the auction was feeding it accordingly, capping that keyword at an even share is a downgrade. Check what the allocation is doing before you take it over.