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LeadGenie · Review calculator
Do the maths once.
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Vol. 2026
Home / Free tools / Review calculator
Free tool · Google reviews

Google review calculator: how many five-star reviews do you need?

Type in your Google rating, how many reviews you have and the rating you want. LeadGenie’s free Google review calculator shows how many five-star reviews it takes to get there, so you know how many customers to ask. It suits any business on Google, and needs no email.

  • Three numbers, one answer, updated as you move them
  • Assumes every new review is five stars, so it’s the minimum
  • Runs in your browser, with nothing sent to us
Free · runs in your browser · no email · made in Parramatta NSW
The calculator, at a glance
Asks
Your rating, review count and target
Shows
Five-star reviews needed to reach it
Assumes
Every new review is five stars
Sends
Nothing. It runs in your browser
Costs
Nothing, and no email needed
Next step
Your free Google review link and QR code
Review tools
Get Found, A$29 a month ex GST
Free
No email needed
3
Numbers to enter
4.9
The realistic top once any review is below five
A$29
Get Found, a month
The calculator

Three numbers, one answer

Use your rating and review count exactly as Google shows them on your listing. The answer assumes every new review is five stars, so treat it as the minimum you need.

Google Review Calculator
How many five-star reviews until you reach your target?

Updates live

Your three numbers
Your current rating 4.3
1.0
5.0
Exactly as Google shows it on your listing.
Reviews you have now 40
1
1,000
The number in brackets next to your stars.
Rating you are aiming for 4.8
3.5
5.0
Most businesses aim for 4.5 to 4.9.
Five-star reviews you need
100

New five-star reviews to lift 40 reviews at 4.3 to an average of 4.8, if every new review is five stars.

Next step

Turn your number into asks

Example: if about one in five customers you ask leaves a review, 100 new reviews means asking about 500 customers. At 10 jobs a week, that’s a year of asking everyone. Make it one tap for them with your free Google review link and QR code, handed over straight after the job. This guide shows customers how to leave one.

Ask every customer in the same words, not only the ones you think were happy. Google’s policy doesn’t allow asking only the customers you expect to be positive, or offering anything for a review. Get Found, A$29 a month ex GST with no set-up fee, makes asking one tap by link, QR code or email, emails you when each review lands, and drafts a reply for you to approve. From Starter, A$199 a month plus A$999 set-up, the request goes by itself when a job is marked done.

How the rating works

Why each review moves it less

Your Google rating is the average of all your star ratings, shown to one decimal place. The more reviews you have, the less any single review moves it, which is why a business with 200 reviews needs far more five-star reviews to climb than one with 20.

It works the other way too: one low review barely dents a rating that rests on hundreds of reviews. Google says your average can take up to two weeks to update after new reviews are posted.

Questions

Google review calculator questions

It depends on where you start. With 40 reviews averaging 4.3, you need 100 more five-star reviews to average 4.8, if every new review is five stars. With 100 reviews at 4.6, you also need 100 more. Use the calculator above with your own numbers.

It multiplies your target by your review count, takes away the stars you already have, and divides by five minus the target. It rounds up, so the answer is never short.

A 5.0 average needs every review to be five stars. Once you have any lower review, more five-star reviews bring you closer but never quite to 5.0, which is why 4.9 is the realistic top.

Google says your average star rating can take up to two weeks to update, and new reviews can be held for a few days while Google checks them against its policies.

No. Google’s policy doesn’t allow offering anything in exchange for a review, or asking only the customers you expect to be happy. In Australia, the ACCC treats incentivised reviews passed off as ordinary ones, and hiding genuine negative reviews, as potentially misleading. Ask every customer the same way and offer nothing.

Turn the number into a plan.

Know your number? Ask every customer, the same way, on the day the job is done. Get Found alerts you when a review lands and drafts your reply, from A$29 a month. To see what LeadGenie can take off your hands, book a free demo.