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Rating Gap Calculator
Change the example inputs to match your business. Your entries stay in this browser; they are not sent to us.
Illustrative inputs are not industry benchmarks. These tools do not audit accounts, send messages or deploy services. Review every output before using it.
A small rating gap can mean a lot of reviews
A 4.2 next to your business name. A 4.5 in your head. How far apart are they? The answer depends on how many reviews sit behind that first number. Ten reviews leave room for a quick change. A thousand carry much more weight.
Use the calculator to check the size of the gap before setting a goal. You can change the expected average of new reviews, too. An all-five-star scenario is a mathematical comparison, not a plan for what customers should say.
The math, without the spreadsheet
Multiply your current average by your review count. That gives the modeled total star points. Add the points from new reviews, then divide by the combined review count.
For 100 reviews averaging exactly 4.2, reaching an exact 4.5 takes 60 additional five-star reviews: (420 + 300) ÷ 160 = 4.5. If the new reviews average 4.8 instead, it takes 100. Same starting business, different assumption.
The minimum count is rounded up from: current review count × (target − current average) ÷ (future average − target). This applies when the target is above your current average and the future average is above the target.
Why your profile might show a different number
A displayed 4.2 may already be rounded. Treating it as exactly 4.2000 can change the review count the model returns. Use a more precise average if you have one, and do not mix counts from different locations or platforms.
This tool targets the unrounded arithmetic average you enter. It does not predict when a platform will display a new number, publish a review or update a profile. Deleted reviews and other changes to the starting set also change the math.
Make the plan about the experience
Start with the recent feedback. If people keep mentioning missed callbacks, unclear quotes or late arrivals, pick one of those problems and fix it. More requests will not repair the thing customers are describing.
Then make an optional, neutral review invitation part of your completed-service process. Give customers room to describe their actual experience. No rewards for reviews, no pressure to choose five stars and no routing only happy customers to the public link.
Check progress against your own baseline: invitations sent appropriately, genuine reviews received and recurring issues resolved. A rating is useful context. It is not the whole business.
Turn the number into a useful next step
Try the same target with a 5.0, 4.9 and 4.8 future average. If the count jumps, your goal depends heavily on an optimistic assumption. That is worth knowing before putting a deadline on it.
Download your scenario and revisit it when the review count changes. For the actual message and follow-up process, open our review-request template in the related resources below. Keep it easy to decline. 👍
Common questions
Can I reach an exact 5.0?
If the current average is below five, adding a finite number of five-star reviews cannot make the unrounded average exactly five. A platform may display a rounded number differently; this tool does not model that display rule.
What if the target is already met?
The calculator returns zero additional reviews. That does not mean you should stop listening to customers.
Does this connect to my Google profile?
No. You enter the numbers. The calculation runs in your browser without a login or sending your inputs to us.
Why can a target be out of reach?
If you are below the target and new reviews average at or below it, they cannot bring the combined unrounded average up to that target in a finite number of reviews. Try another scenario, without treating it as a request for a particular rating.