How Many 5-Star Reviews Do You Need to Raise Your Google Rating?

To work out how many 5-star reviews you need to raise your rating on Google, use this formula: current number of reviews × (target rating − current rating) ÷ (5 − target rating). A business with 100 reviews at 4.2 stars needs 60 new 5-star reviews to reach 4.5, and no other ratings in between.

The rest of this guide explains where the formula comes from, gives you a table for the most common jumps, and covers the things the formula leaves out: lower ratings mixed in with the 5-star ones, the time Google takes to update, and why a perfect 5.0 is not a realistic goal.

Google says the review score is the average of all ratings published on Google for that place or business, on a scale of 1 to 5 stars. In other words, it is the total number of stars divided by the number of published ratings.

You need current reviews × (target − current rating) ÷ (5 − target) new 5-star reviews, rounded up. It works because your rating is total stars divided by total reviews, so each new 5-star review pulls the average up by a little less than the one before.

Worked example: 100 reviews at 4.2, target 4.5. That is 100 × 0.3 ÷ 0.5 = 60. Check it: 100 reviews at 4.2 add up to 420 stars. Add 60 five-star reviews (300 stars) and you have 720 stars across 160 reviews, which is exactly 4.5.

It depends on how many reviews you already have: the more you have, the more new 5-star reviews each step takes. The table applies the formula to three profile sizes, rounded up to whole reviews.

Two patterns stand out. First, the number grows in direct proportion to your review count, so a newer business can move its rating much faster than an established one. Second, the closer the target is to 5.0, the harder each tenth becomes: going from 4.8 to 4.9 takes as many new reviews as you already have.

To get back to where you were after one 1-star review, you need (current rating − 1) ÷ (5 − current rating) new 5-star reviews. Unlike the main formula, this does not depend on how many reviews you have.

This is why a single unhappy customer feels so costly to a highly rated business. It is also why the reply matters: a calm, specific response shows the next reader how you handle problems. Our guide on how to respond to Google reviews has examples for negative reviews.

Then your rating drifts toward the average of your new reviews, not toward 5.0. If your new reviews average less than your target, you will never reach it, however many you collect.

For a realistic estimate, replace the 5 in the formula with the average of your recent reviews: current reviews × (target − current) ÷ (recent average − target). Take the same business with 100 reviews at 4.2. If its new reviews average 4.8, reaching 4.5 takes 100 × 0.3 ÷ 0.3 = 100 new reviews, not 60. If its new reviews average 4.4, the business will settle near 4.4 and never reach 4.5.

So the most useful number to watch is not your overall rating but the average of your last few months of reviews. If that recent average is below where you want to be, the fix is in the service itself: read what customers mention most, deal with the recurring issue, then keep asking every customer.

Not once any lower rating is published. The average can get very close to 5.0, but every rating below five stars keeps it under 5.0 for as long as that rating stays published, which is why the formula breaks down when the target is exactly 5.

That is not something to worry about. Google's own help page says a mix of positive and negative feedback often feels more trustworthy, and a high rating backed by plenty of recent, detailed reviews tells customers more than a perfect score from a handful of people.

Divide the number of reviews you need by the number of new reviews you get each month. If you need 60 and currently receive 10 a month, plan on about six months, plus up to two weeks for Google to update the score after the last one.

The only honest way to shorten that is to ask more of your customers, more consistently, at a moment when leaving a review takes them a few seconds.

Ask every customer, make the review form one tap away, and let them choose the rating and words. Google allows businesses to ask for reviews with a link or QR code, but bans anything that skews who reviews or what they say.

Only if the review breaks Google's policies. Google says you can report any review, but only those that violate its policies are eligible for removal, and it asks businesses not to report reviews just because they disagree with them.

If a review is spam, off-topic or from someone who was never a customer, report it from your Business Profile and track it in Google's Reviews Management Tool. For a genuine but unfair review, a professional reply and a steady flow of new reviews from real customers will do more for your score over time.

Rating and review count work together. To see how both feed into local search, read how many Google reviews you need to rank higher and browse our local SEO topic hub.