How One 1-Star Google Review Changes Your Rating

A single 1-star Google review can lower your overall rating more than you might expect — especially if your business does not have many reviews yet.

The exact impact depends on two things:

Your current number of Google reviews
Your current average star rating

Google states that a business’s review score is the average of all ratings published on Google for that business. A newly submitted rating may also take time to be reflected in the displayed score.

Quick Answer: How Much Does One 1-Star Review Hurt?

If every existing review were 5 stars, here is what would happen after receiving one new 1-star review:

Reviews Before the 1-Star Review	Rating Before	Approx. Rating After
10	5.0	4.64
25	5.0	4.85
50	5.0	4.92
100	5.0	4.96
250	5.0	4.98

The takeaway is simple:

The fewer reviews your business has, the more damage a single 1-star rating can do.

A business with 10 perfect reviews can be affected dramatically by one 1-star review.

A business with hundreds of reviews has much more protection because the new rating represents a smaller percentage of the total.

Calculate the Impact on Your Business

Every business has a different review history, so generic examples only tell part of the story.

Use our free Google Review Rating Calculator to enter your actual 1-star through 5-star review counts and see:

Your calculated current rating
How specific reviews are affecting your average
What your rating could look like if selected reviews were no longer included
Approximately how many additional 5-star reviews it could take to reach the same rating another way

[Calculate My Google Rating →]

No signup required.

How Is a Google Review Rating Calculated?

At its simplest, your rating can be represented as a weighted average of all published star ratings.

For example, suppose a business has:

35 five-star reviews
4 four-star reviews
0 three-star reviews
0 two-star reviews
13 one-star reviews

That business has 52 reviews.

The weighted calculation is:

(35 × 5) + (4 × 4) + (13 × 1) = 204 total rating points

Then:

204 ÷ 52 = 3.92

That produces an approximate rating of 3.9 stars.

Google confirms that its review score is based on the average of published ratings, although the displayed score may not update immediately after a new review is posted.

Why Does One 1-Star Review Affect Small Businesses More?

Think of your Google rating as an average.

When you only have a small number of reviews, every individual rating represents a large portion of that average.

If you have:

10 reviews

then one new review becomes roughly 9% of your 11-review profile.

If you have:

500 reviews

one new review represents less than 1% of the total.

That is why businesses with newer or smaller Google Business Profiles often notice a much larger rating change after receiving a single negative review.

Example: One 1-Star Review After 10 Five-Star Reviews

Suppose your business has:

10 five-star reviews

Your rating is:

5.0 ★

Then you receive one 1-star review.

Your new average becomes:

51 total rating points ÷ 11 reviews = 4.64

So one 1-star review can mathematically move a perfect 5.0 profile to approximately:

4.6 ★

That is a significant change from a single review.

Example: One 1-Star Review After 100 Five-Star Reviews

Now consider the same review for a business with:

100 five-star reviews

Before:

5.0 ★

After receiving one 1-star review:

501 total rating points ÷ 101 reviews = 4.96

The mathematical average remains very close to 5 stars.

Same 1-star review.

Very different impact.

The difference is review volume.

How Many 5-Star Reviews Does It Take to Offset a 1-Star Review?

There is no single answer because it depends on your starting rating and total number of reviews.

As your review count grows, changing your average becomes progressively harder.

For example, adding a few 5-star reviews can make a noticeable difference when a business has only 10 or 20 reviews.

If a business already has hundreds of reviews, moving the rating even one decimal point can require many additional 5-star ratings.

That is why it is useful to calculate the number using your actual review distribution rather than relying on a generic rule.

[See How Many 5-Star Reviews You Need →]

Can One Bad Google Review Drop You From 5.0 to 4.9?

Yes.

In fact, a single 1-star review can cause an even larger mathematical drop when your review count is small.

For example:

25 existing 5-star reviews + one 1-star review

produces an approximate mathematical average of:

4.85 ★

With more reviews, the impact becomes smaller.

The exact rating displayed on your Google Business Profile may differ slightly or take time to update. Google says a new review can take up to two weeks to affect the displayed review score.

Does a 1-Star Google Review Affect Local SEO?

Potentially.

Google says local search results are primarily influenced by relevance, distance, and prominence.

Google also specifically states that more reviews and positive ratings can help a business’s local ranking.

That does not mean one 1-star review automatically causes a ranking drop.

However, your review profile can affect more than the number displayed next to your business.

A lower rating may influence:

How potential customers perceive your business
Whether someone clicks your listing
How your profile compares with nearby competitors
Overall review and reputation signals associated with your Business Profile

For many businesses, the conversion impact is just as important as the SEO impact.

What Should You Do After Receiving a 1-Star Review?

First, determine what kind of review it is.

If It Is a Legitimate Customer Review

A negative review does not violate Google’s policies simply because the business disagrees with it.

Consider:

Responding professionally
Addressing the concern
Taking the conversation offline when appropriate
Continuing to earn authentic reviews from real customers

Google encourages businesses to respond to customer reviews, and helpful responses can help businesses stand out.

If You Believe the Review Violates Google’s Policies

That is different.

Google prohibits several categories of review content, including certain forms of:

Fake engagement
Reviews that do not reflect a genuine experience
Conflict-of-interest reviews
Competitor reviews intended to undermine a business
Certain current or former employee conflicts
Harassment or offensive content
Off-topic content
Misrepresentation
Repetitive content

Google's policies specifically state that contributions should reflect genuine experiences and that fake engagement and certain conflicts of interest are prohibited.

A review should be evaluated against the actual policy rather than challenged simply because it has one star.

Can a 1-Star Google Review Be Removed?

Sometimes.

Google does not remove a review merely because it is negative.

A review generally needs to violate Google’s content policies or applicable law to have legitimate grounds for removal.

Google's Maps policies prohibit content such as fake engagement, certain conflicts of interest, off-topic content, impersonation, harassment and other prohibited material.

If you believe a review violates one of those policies, it may be worth evaluating and challenging.

Think a Review Shouldn’t Be There?

Review Resolve offers a free review analysis.

We evaluate the reviews you are concerned about and determine whether they may have legitimate grounds for a policy-based challenge.

[Get My Free Review Analysis →]

No upfront payment.

If you choose to move forward with Review Resolve, you only pay for reviews that are successfully removed.

Removing One Review vs. Earning More 5-Star Reviews

Sometimes the most interesting part of the math is not how much a bad review lowered your rating.

It is how difficult it can be to raise the rating again.

Consider a hypothetical business with:

52 total reviews
35 five-star reviews
4 four-star reviews
13 one-star reviews

Its calculated rating is approximately:

3.9 ★

If 12 of those one-star reviews were hypothetically no longer included, the remaining profile would be:

35 five-star reviews
4 four-star reviews
1 one-star review
40 total reviews

Calculated rating:

4.8 ★

Trying to reach a similar rating exclusively by adding new five-star reviews could require a very large number of additional reviews.

That is why businesses should understand both sides of their reputation:

Review Growth

Continue earning genuine reviews from real customers.

Review Quality

Evaluate questionable reviews to determine whether they comply with Google’s policies.

One should not replace the other.

A Bad Review Is Not Automatically a Removable Review

This distinction matters.

A customer can have a negative experience and leave a legitimate 1-star review.

Businesses should not attempt to suppress authentic criticism simply because it lowers their rating.

Google explicitly allows businesses to encourage genuine customer reviews, but prohibits practices intended to manipulate ratings, such as incentivized or selectively solicited reviews.

Review removal should therefore focus on reviews that have legitimate policy-based grounds for a challenge.

At Review Resolve, that is why the process begins with analysis.

Use the Free Google Review Rating Calculator

Want to see exactly how your own review profile works?

Enter your current:

5-star reviews
4-star reviews
3-star reviews
2-star reviews
1-star reviews

Then select the reviews you want to analyze.

The calculator will show you:

Your Current Rating

See the weighted average behind your review profile.

Your Potential Rating

See what your rating could mathematically look like if selected reviews were no longer included.

The 5-Star Alternative

See approximately how many new 5-star reviews it could take to achieve a similar rating.

Your Potential Removal Pricing

See the applicable Review Resolve pricing tier before contacting anyone.

Free. Instant. No Signup Required.

[Calculate My Rating →]

Frequently Asked Questions

How much does one 1-star review lower your Google rating?

It depends on your current rating and total number of reviews. The fewer reviews you have, the larger the impact one 1-star rating can have. For example, 10 perfect 5-star reviews followed by one 1-star review produces a mathematical average of about 4.64 stars.

Can one 1-star review ruin a 5.0 Google rating?

Yes. Any rating below 5 stars will lower a perfect 5.0 mathematical average. How far it falls depends on how many existing reviews the business has.

How many 5-star reviews do I need to cancel out a 1-star review?

There is no universal number. It depends on your existing rating, total number of reviews and the rating you want to reach. A rating calculator using your full star distribution provides a more useful estimate.

Will Google remove a fake 1-star review?

Google may remove reviews that violate its content policies. Fake engagement, certain conflicts of interest, off-topic content and other prohibited content may be eligible for removal. Google ultimately determines whether a review violates its policies.