How many 5‑star reviews do you need?
Five-star reviews needed = your review count × (target - rating) ÷ (5 - target). At 4.2 with 50 reviews, reaching 4.5 takes 30. Put in your numbers to see yours, how long it takes at your pace, and what one bad review costs.
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Your Google profile today
Count the last 3 months on Google and divide by 3.
If you asked every customer
20% is my estimate, not a statistic. BrightLocal's Local Consumer Review Survey 2026 found "83% of people asked to leave a review went on to leave one this year," but that's per person across a whole year, not per request, so I start lower. Set it to what you see. Source: BrightLocal, checked Sep 2026.
Optional: a competitor on the map
Five-star reviews needed
16
Counts every new review as five stars, the best case, and aims at the exact average.
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How the math works
Google's help page says your score "is the average of all ratings published on Google for that place or business." Your rating times your review count is your total stars, and each five-star review adds 5 stars and 1 review. The calculator finds the smallest number that lifts the average to your target. Source: Google Business Profile Help, checked Sep 2026.
five-stars needed = reviews × (target - rating) ÷ (5 - target), rounded up
Want your current average from your star counts instead? Multiply each star level by how many reviews it has, add them up, and divide by the total. 40 five-stars, 6 fours, 2 threes and 2 one-stars is (200 + 24 + 6 + 2) ÷ 50 = 4.64.
star rating = (5×fives + 4×fours + 3×threes + 2×twos + 1×ones) ÷ total reviews
- Every new review is five stars. That's the best case, so read the months as the fastest path, not a forecast. If new reviews average 4.8, put 4.8 where the formula says 5. If they average at or below your target, volume alone never gets you there.
- The exact average. Google shows one decimal and doesn't say how it rounds, so I aim at the exact number. Its help page also says a new score can take "up to 2 weeks" to show.
- The faster pace is yours. It's jobs per month times the share who leave a review when asked, starting at my 20% estimate. You set both.
- What one bad review costs. At any rating, (rating - 1) ÷ (5 - rating) five-stars cancel one 1-star review.
A worked example
A plumber has a 4.2 rating from 50 reviews and wants 4.5.
- Total stars now: 50 × 4.2 = 210.
- The gap: 50 × (4.5 - 4.2) = 15 stars short.
- Each five-star review closes 5 - 4.5 = 0.5 of that gap.
- 15 ÷ 0.5 = 30 five-star reviews. Check: (210 + 150) ÷ 80 = 4.5.
At 2 new reviews a month, that's 15 months. Asking all 40 customers a month, with 1 in 5 leaving a review, it's 8 a month and about 4 months. At 4.5, one 1-star review takes (4.5 - 1) ÷ (5 - 4.5) = 7 five-stars to cancel.
How to read your number
Read the months at your current pace, then find your band.
You're there
You don't need more five-stars for this target. Keep reviews fresh: BrightLocal's 2026 survey found 74% of people only care about reviews written in the last three months.
Close
Your current pace gets you there. You don't need a new system for this goal. Keep asking every customer, every time.
The ask is the bottleneck
Your work earns the reviews. What's missing is asking everyone, every time, with a direct review link.
It needs a system
Memory won't ask every customer. A review request that goes out after every finished job will.
Count comes first
BrightLocal's 2026 survey found 47% of people won't use a business with fewer than 20 reviews. Get to 20 before you worry about the decimal.
Source: BrightLocal, Local Consumer Review Survey 2026 (1,002 US adults), checked Sep 2026.
The rule: ask every customer
Your number is arithmetic, not a quota. Google's Maps content policy lists this under rating manipulation: merchants may not "discourage or prohibit negative reviews, or selectively solicit positive reviews from customers." It bans incentives for reviews, and it also calls out asking staff to "solicit a certain number of reviews."
So ask every customer, the same way, for an honest review. Never ask for five stars, never screen people first, never pay for a review. The fair lever is asking more people, at a good moment, with less friction. Source: Google Maps User Generated Content Policy, checked Sep 2026.
Get your Google review link in 3 steps
- Go to your Business Profile, signed in with the account that manages it.
- Select Read Reviews, then Get more reviews.
- Select Copy to copy the link. For a QR code, right-click it and save the image. Google says review QR codes can only be made in a computer browser, not on a phone.
Google suggests putting the link on receipts, in thank-you emails, and at the end of a chat. I'd put it wherever a job ends, while the work is fresh. More in how to get more Google reviews and the Google Business Profile checklist. Source: Google Business Profile Help, checked Sep 2026.
Questions people ask
How many 5-star reviews do I need to raise my Google rating? +
Your review count times the gap to your target, divided by 5 minus the target, rounded up. At 4.2 with 50 reviews, reaching 4.5 takes 50 × 0.3 ÷ 0.5 = 30 five-star reviews.
How many 5-star reviews does it take to cancel out a 1-star review? +
At a 4.5 rating, 7. The formula is (rating - 1) ÷ (5 - rating): 3 at 4.0, 7 at 4.5, 19 at 4.8. The higher your rating, the more one bad review costs to undo.
How is the Google review rating calculated? +
It's the average of all ratings published on Google for your business, per Google's Business Profile help page. A new review can take up to 2 weeks to show in the score, and Google doesn't say how it rounds the one-decimal number you see.
Can I ask only my happy customers for Google reviews? +
No. Google's Maps content policy lists selectively soliciting positive reviews as rating manipulation, and it bans offering anything in exchange for a review. Ask every customer the same way, for an honest review.
Want every customer asked, every time?
The review engine is a one-time build: after every finished job, every customer gets a review request with your one-tap Google link. Fixed-scope quote after a short call. I take on a limited number of builds each month.