Amazon PPC Broad Match: When It Pays, When It Wastes Budget, and How to Keep It on a Leash

Written by the BidVentor Editorial Team. Reviewed by Adeel Imrani, founder of BidVentor (14 years growing a $2M beauty brand on Amazon, $30M+ ad spend). Last updated November 2026.

Quick answer

Amazon PPC broad match shows your ad for any search that contains your keyword terms in any order, plus singulars, plurals, variations, synonyms and related terms. The keyword itself does not even have to appear in the search. That makes broad match the best discovery tool you have and the easiest way to waste budget. Use it to find search terms, bid it lower than phrase and exact, check how much of its spend lands on irrelevant searches (we call this the drift rate), add negatives weekly, and move proven search terms into exact match so each one gets its own bid.

Key takeaways

• Amazon’s own example: the broad keyword “sneakers” can match “basketball shoes”, “cleats” and “foam runners”. Broad match goes well beyond the words you typed.
• Treat broad match as a paid research tool, not as a looser version of exact match.
• Track your drift rate: spend on search terms that do not fit your product, divided by total broad match spend. Under 20% is healthy. Over 40% needs tighter negatives, a lower bid or fewer broad keywords.
• Bid broad lowest, phrase in the middle and exact highest, as Amazon itself recommends.
• Promote a search term to exact match once it has enough clicks and orders to prove itself, and then negate it in the broad campaign so the two do not compete.

How Amazon PPC broad match actually works

In Sponsored Products, a broad match keyword is eligible to show when a shopper’s search contains your keyword terms in any order. It can also match singular and plural forms, close variations, synonyms and related terms, based on the meaning of the keyword and the context of your product. Amazon states plainly that the keyword itself may not be contained in the shopper’s search.

Take a hair serum seller who targets the broad keyword “hair serum”. The ad could show for:

• “serum for frizzy hair” (the same terms, different order and extra words)
• “hair serums” (a plural)
• “anti frizz oil” (a related term)
• “argan hair treatment” (related, and only loosely connected)

The first three might be exactly what you want. The last one might be a shopper who wants a mask, not a serum. Amazon decides how close a match is, and it does not publish its relevance rules. What you control is the bid, the negatives, the product page information Amazon uses to judge relevance, and what you do with the results.

Automatic campaigns use Amazon’s own close match, loose match, substitutes and complements, which is a different discovery route. We cover it in our guide to automatic campaigns that are not working.

When broad match pays

Broad match earns its place in three situations:

1. You are launching. You do not yet know the words shoppers use. Broad match lets Amazon show you.
2. Your category is wide. Hair care, kitchen and pet products all have many ways to describe the same need. Broad match finds the ones you did not think of.
3. You want to find new long-tail terms. The most profitable terms are often phrases you would never have guessed. They show up in the search term report, not in a keyword tool.

In each case the job is the same: buy information, then act on it. Broad match is rarely where you want most of your sales to come from for long. It is where you find the terms that should.

When broad match wastes budget

Broad match drains money when you leave it unattended. The usual causes are:

• Broad keywords that are too general. A single word like “serum” or “mat” invites every kind of serum or mat.
• A bid set as high as the exact match bid. Broad searches convert lower, so the same bid costs more per order.
• No negatives. Without negatives, the same irrelevant search term can collect clicks for months.
• An unclear product page. Amazon uses your title, bullets, description and backend terms to judge relevance. A vague listing gets vague matches.
• Duplicate coverage. The same term in broad, phrase and exact, all live at the same bids, with no plan for which should win.

Amazon says you will not bid against yourself by adding different match types for the same keyword. That is true for the auction, but it does not stop your budget from being split in ways you did not choose. Plan which match type should carry each term.

The drift rate: how to tell if broad match is working

Most sellers judge broad match by its ACoS. That hides the real question, which is how much of the money went to searches you would never have chosen. A simple measure answers it.

Drift rate = spend on search terms that do not fit your product ÷ total broad match spend

Here is how to measure it in 20 minutes:

1. Open your Search Term Report for the last 30 days and filter to broad match.
2. Sort by spend, highest first.
3. Mark each search term as fit, maybe or no fit. Fit means a shopper with that search would be happy to receive your product. No fit means they would not.
4. Add up the spend on the no-fit rows and divide by the total.

How to read the result, as a rule of thumb from our own work and not an Amazon benchmark:

Drift rate	What it usually means	What to do
Under 20%	Healthy discovery	Keep going, add negatives weekly
20% to 40%	Normal for a young campaign	Add negatives, lower the bid by 10% to 20%
Over 40%	Keywords too general or listing unclear	Replace one-word keywords with two or three word phrases, check the listing

The point is not precision. It is to make the problem visible before next month’s bill arrives.

The leash method: five settings that keep broad match under control

1. Use specific keywords

Two-word and three-word keywords such as “vitamin c serum” or “silicone baking mat” give Amazon a clearer meaning to match against than “serum” or “mat”. Fewer irrelevant matches, and you still find new terms.

2. Set the bid gap

Amazon recommends the highest manual bid on exact, a lower bid on phrase and the lowest on broad. A workable starting point is to bid broad at 60% to 80% of your exact bid, phrase at 80% to 90%. These percentages are our starting suggestion, not an Amazon rule, so adjust them as data comes in. First work out the ceiling with our guide to your max CPC, then set each match type below it.

3. Add negatives every week

Open the search term report each week and add every no-fit term as a negative exact keyword in the broad campaign. Use negative phrase for words that are never right for you, such as “men’s” when you sell women’s products. Our guide to negative keywords shows how to do this without blocking good traffic.

4. Give it a small, separate budget

Put broad keywords in their own campaign, so a hungry broad match cannot starve your proven exact terms. A good starting split is 15% to 25% of the total ad budget for discovery, then adjust to how many winners it finds.

5. Wait for enough clicks

Do not judge a search term on a handful of clicks. A term needs roughly two to three times the clicks your break-even conversion rate implies before you act. We explain the maths in our guide to your break-even PPC conversion rate.

Promote winners to exact match

The point of broad match is to hand you search terms worth owning. Once a search term has enough data, graduate it:

1. Pick the winners. In the search term report, find terms with at least two orders and a conversion rate above your break-even rate.
2. Add each as an exact match keyword, in a campaign built for proven terms, with its own bid based on its own numbers.
3. Add it as a negative exact in the broad campaign. Now the broad campaign keeps exploring and the exact campaign handles the sales.
4. Keep a log. Note the date and the starting bid, so you can check in two weeks whether the term held its conversion rate.

For the wider picture of how the three match types fit together, read our guide to broad vs phrase vs exact match.

A worked example

This is an illustrative example, not client data. A seller has a $28 silicone baking mat and a 30% target ACoS, so price × target ACoS is $8.40. Their exact bid on “silicone baking mat” is $0.90.

Their broad campaign targets “baking mat” and bids $0.90, the same as exact. After 30 days, the search term report shows:

Search term	Clicks	Orders	Spend	Fit?
silicone baking mat set	64	8	$57.60	Fit
baking mat half sheet	38	5	$34.20	Fit
pastry mat with measurements	41	1	$36.90	Maybe
rolling pin	33	0	$29.70	No fit
cookie sheet pans	52	0	$46.80	No fit
oven liner	22	0	$19.80	No fit

Total spend is $225. No-fit spend is $96.30, so the drift rate is about 43%. That is over the 40% line.

The actions are clear:

• Add “rolling pin”, “cookie sheet pans” and “oven liner” as negative exact.
• Change the broad keyword to “silicone baking mat” and “non stick baking mat”, which are more specific than “baking mat”.
• Lower the broad bid to $0.65, which is about 72% of the exact bid.
• Move “silicone baking mat set” and “baking mat half sheet” to exact with their own bids, then negate them in the broad campaign.

Next month, the same budget has fewer places to leak, and two new exact terms are in the campaign that reports the sales.

How BidVentor helps with broad match

The BidVentor PPC tool connects to your Amazon Ads account through the Amazon Ads API (BidVentor is a verified Amazon Ads partner), or works from your bulk files. It shows which search terms keep spending without orders, suggests negatives, and flags terms that have earned a move to exact match. Each suggestion shows the clicks, CPC, conversion rate, ACoS and spend behind it, so you can check it against your own break-even line before you apply it. The PPC tool carries a 4X ROAS guarantee that applies to PPC only, and terms apply.

Broad match also depends on how clearly your listing describes the product. Buyer Blueprint reads all reviews for your ASIN or a competitor’s and shows the words buyers use, which are often the best broad keywords you have. Listing Genius COSMO turns that buyer language into a title, bullets and description built for Amazon’s COSMO algorithm and Rufus, so the searches Amazon matches to you are closer to the ones you want.

You get one free analysis after you sign up, which is a quick way to see where your broad match spend is going.

Frequently Asked Questions

What is broad match in Amazon PPC?

Broad match is the widest keyword match type in Sponsored Products. Your ad can show when a search contains your keyword terms in any order, and it can also match singulars, plurals, variations, synonyms and related terms. The keyword itself may not appear in the search.

Is broad match good for Amazon PPC?

It is good for discovery and risky for profit if left unmanaged. Use it to find search terms, bid it lower than phrase and exact, add negatives each week, and move winners to exact match.

How much should I bid on broad match compared with exact match?

Amazon recommends the highest manual bid on exact, a lower one on phrase and the lowest on broad. As a starting point, we suggest bidding broad at roughly 60% to 80% of your exact bid, then adjusting using your search term data.

How do I stop broad match from wasting money?

Use specific two-word or three-word keywords, keep broad in its own campaign with a small budget, add no-fit search terms as negatives weekly, and track your drift rate. If more than 40% of broad spend goes to searches that do not fit your product, tighten the keywords and the bid.

Should I turn broad match off once I find winning terms?

Not usually. Keep it running at a lower bid so it keeps finding new terms, and add each winning term as an exact keyword and a negative exact in the broad campaign. Pause broad only when it stops producing new winners and its drift rate stays high.

Sources and further reading

• Amazon Ads guide: targeting with Sponsored Products, including broad, phrase and exact match.

Related guides

• Broad vs phrase vs exact match: which to use
• Negative keywords: stop wasted clicks
• How to work out your max CPC
• Amazon PPC conversion rate: your break-even rate

About the reviewer

Adeel Imrani is the founder of BidVentor. He spent 14 years growing a $2M beauty brand on Amazon and has managed $30M+ in ad spend. Read more on his author page.

How we make this content

These guides are written by the BidVentor Editorial Team and reviewed by Adeel Imrani. Where we cite Amazon features or numbers, we link to Amazon’s own documentation. We update guides when Amazon’s tools or our guidance change, and we describe BidVentor’s features as they work today. See our methodology, or contact us with corrections.