Know your exact star counts? Get an exact answer
Your shown rating is already rounded. Type how many of each star you have and the calculator works from the true average instead.
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The formula
Your average is total stars divided by number of reviews. To find how many new 5-star reviews (x) lift a rating R with N reviews up to a goal G:
x = N × (G − R) ÷ (5 − G)
Round up, since half a review doesn't exist. From 4.3 with 60 reviews to a 4.7 average: 60 × 0.4 ÷ 0.3 = 80. If the site rounds to one decimal, 4.65 is enough to show 4.7, which takes 60.
What one 1-star review costs
The higher you sit, the more a single 1-star review hurts. Here's how many 5-star reviews it takes to get back to where you were after one 1-star, with 50 reviews before it:
| Your rating | 5-star reviews to cancel one 1-star |
|---|---|
| 4.0 | 3 |
| 4.3 | 5 |
| 4.5 | 7 |
| 4.7 | 13 |
| 4.8 | 19 |
| 4.9 | 39 |
That table is why getting a review removed that breaks the site's rules is worth the effort. Read how to get bad reviews removed and how to appeal.
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See review requestsQuestions people ask
How many 5-star reviews do I need to raise my rating?
Use the calculator above. The short rule: new reviews needed = reviews you have × (goal − rating now) ÷ (5 − goal).
How do I work out my average star rating?
Add up every star and divide by the number of reviews. Twelve 5-star reviews and three 4-star reviews is 72 stars over 15 reviews, a 4.8 average. Put your star counts in the box above and it does it for you.
Why does the calculator give two numbers?
Most sites round what they show. A 4.65 average can show as 4.7. One number is what it takes to show your goal, the other is what it takes to truly average it.
Is a 4.9 better than a 5.0?
Plenty of shoppers trust a 4.7 to 4.9 more than a perfect 5.0, because a perfect score with a few reviews can look fake. More reviews at 4.8 usually beat a handful at 5.0.
Does this work for Google, Yelp and the rest?
The math is the same plain average. Each site has its own twist, like Trustpilot's starter reviews or Uber's last 500 trips, so each one has its own calculator below.