Star Rating Calculator: How Many 5-Star Reviews Do You Need?
Enter your current rating and review count to see exactly how many 5-star reviews it takes to reach your target.
No signup required · Exact for Google and Tripadvisor
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Used to estimate how long it will take
Google's score is the plain average of every rating on Google, so this result is exact. A new review can take up to 2 weeks to show in your score.
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Current
100 reviews
Target
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How many 5-star reviews do you need?
Your rating is a plain average. Google says its score is "the average of all ratings published on Google for that place or business" (Google). That means you can work out exactly how many 5-star reviews it takes to reach a target:
Example: 100 reviews at 4.2, aiming for 4.5. That's 100 × 0.3 ÷ 0.5 = 60 five-star reviews in a row.
A shortcut worth remembering: going from 4.0 to 4.5 takes as many new 5-star reviews as you already have. 80 reviews need 80 more.
Real averages aren't round numbers, and some new reviews will be 4 stars, so treat any result as a minimum. The calculator above shows what happens with a mix of 4- and 5-star reviews.
5-star reviews needed: quick lookup table
Find your current rating and target in the left column, then read across to your current number of reviews.
| From → to | 10 reviews | 25 reviews | 50 reviews | 100 reviews | 250 reviews | 500 reviews |
|---|---|---|---|---|---|---|
| 3.5 → 4.0 | 5 | 13 | 25 | 50 | 125 | 250 |
| 3.8 → 4.0 | 2 | 5 | 10 | 20 | 50 | 100 |
| 3.9 → 4.0 | 1 | 3 | 5 | 10 | 25 | 50 |
| 4.0 → 4.2 | 3 | 7 | 13 | 25 | 63 | 125 |
| 4.0 → 4.5 | 10 | 25 | 50 | 100 | 250 | 500 |
| 4.1 → 4.5 | 8 | 20 | 40 | 80 | 200 | 400 |
| 4.2 → 4.5 | 6 | 15 | 30 | 60 | 150 | 300 |
| 4.3 → 4.5 | 4 | 10 | 20 | 40 | 100 | 200 |
| 4.4 → 4.5 | 2 | 5 | 10 | 20 | 50 | 100 |
| 4.4 → 4.6 | 5 | 13 | 25 | 50 | 125 | 250 |
| 4.5 → 4.7 | 7 | 17 | 34 | 67 | 167 | 334 |
| 4.5 → 4.8 | 15 | 38 | 75 | 150 | 375 | 750 |
| 4.6 → 4.8 | 10 | 25 | 50 | 100 | 250 | 500 |
| 4.7 → 4.8 | 5 | 13 | 25 | 50 | 125 | 250 |
| 4.7 → 4.9 | 20 | 50 | 100 | 200 | 500 | 1,000 |
| 4.8 → 4.9 | 10 | 25 | 50 | 100 | 250 | 500 |
Calculated with the formula above, assuming your current average is exactly the rating shown and every new review is 5 stars.
What one 1-star review costs you
The higher your rating, the more 5-star reviews it takes to win back a single 1-star review. The rule is (your rating − 1) ÷ (5 − your rating):
At 4.0 stars
3 five-star reviews
At 4.2 stars
4 five-star reviews
At 4.5 stars
7 five-star reviews
At 4.7 stars
13 five-star reviews
At 4.8 stars
19 five-star reviews
At 4.9 stars
39 five-star reviews
Volume protects you too. A business with 10 reviews at 4.8 drops to about 4.45 after one 1-star review. With 250 reviews, the same review moves it to about 4.78. A steady flow of reviews from all your customers keeps one bad day from defining your rating.
What rating should you aim for?
In BrightLocal's 2026 survey of 1,002 US consumers, 92% care about star ratings when choosing a business, 68% will only use a business with four stars or more, and 31% will only use one with 4.5 or more, up from 17% a year earlier (BrightLocal). In Local Falcon's study of 50.4 million US local search results, most businesses in the 3-pack had 4.8 to 4.9 stars, and ranking was very hard below 4.3 (Local Falcon).
A perfect 5.0 isn't necessary. Only 10% of consumers insist on it, and Northwestern's Spiegel Research Center found that, for products sold online, purchase likelihood typically peaks at ratings of 4.0 to 4.7 and drops as ratings approach 5.0 (Spiegel Research Center).
More on this in our guide: What is a good Google rating? (Is 4.2 good? Is 3.9 bad?)
How each review site calculates your rating
A plain average of every rating published on Google, including star-only ratings. A new review can take up to 2 weeks to show in the score. Source
Tripadvisor
A simple average of all posted review ratings, shown to one decimal place since early 2025. The bubble icons still round to the nearest half. Source
Yelp
Only reviews Yelp's software recommends count toward your star rating and review count. Reviews that look requested may not be recommended. Source
Trustpilot
Not a simple average. Recent reviews carry more weight, and every business's TrustScore includes 7 neutral (3.5-star) reviews, which matter less as reviews build up. Source
Uses recommendations rather than a star average. A Page shows a rating only if recommendations are on and it has at least 5 reviews, and only public reviews count. Source
How to raise your rating, the right way
- Ask every customer, the same way, soon after their visit. In BrightLocal's 2026 survey, 78% of consumers were asked for a review in the past year, and positive experiences were written up about twice as often as negative ones.
- Make it one tap. Send your direct Google review link by text or email, and put the QR code on receipts. Google gives you both under Read reviews, then Get more reviews, in your Business Profile.
- Fix what your low ratings tell you. If three people mention the wait, the wait is the problem. Our free review sentiment analyzer groups what customers praise and complain about.
- Reply to every review. 80% of consumers are more likely to use a business that replies to all its reviews (BrightLocal, 2026).
- Report reviews that break the rules. Spam and reviews from competitors or ex-employees can be reported from your Business Profile. Honest negative reviews stay.
What not to do
Asking only happy customers
That's review gating. Google's policy forbids merchants to "selectively solicit positive reviews from customers."
Asking for five stars
Google only allows asking for reviews "without ... attempting to influence the rating or the contents of the review."
Offering anything for a review
Discounts, freebies and prize draws for reviews break Google's policy even when the reviews are honest.
Buying or writing fake reviews
Google can remove them, block new reviews or show a warning on your profile, and the FTC's rule on fake reviews allows civil penalties.
Sources: Google's review policy, Google's restrictions for violations. More in how to ask for 5-star reviews without breaking Google's rules.
How Spokk helps you get there
This calculator shows the target. Spokk asks every customer, so the reviews keep coming.
A short feedback request after every visit
Every customer gets a quick form by text or email. Low ratings reach you straight away so you can follow up.
The same review invitation for everyone
Whatever they rated, every customer gets the same invitation to review you on Google.
Help writing, in their own words
Customers who want help get a draft built only from their own feedback. They can edit or replace it, then post it themselves.
On our platform, 1.4x more customers click through to Google when the request includes an AI-written draft.
Frequently asked questions
How many 5-star reviews do I need to raise my rating?
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How many 5-star reviews do I need to go from 4.0 to 4.5 stars?
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How many 5-star reviews do I need to go from 4.2 to 4.5?
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Can I get a 5.0 rating?
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How does Google calculate my star rating?
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How many 5-star reviews does it take to undo one 1-star review?
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Does the calculator work for Yelp, Tripadvisor and Trustpilot?
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What is a good star rating?
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Can I offer customers a discount or reward for a review?
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What is the fastest legitimate way to raise my rating?
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