The calculator solves for the number of new 5-star reviews required for a weighted average to reach the target:
reviews needed = current reviews × (target − current rating) ÷ (5 − target)
The result is rounded up to a whole review. It assumes every new review is 5 stars. A mix of ratings changes the result.
Why the real number can differ
- The rating displayed publicly may be rounded.
- New reviews may not all be 5 stars.
- Reviews may be delayed, edited, or removed after moderation.
- A target of exactly 5.0 cannot be reached mathematically when the current exact average is below 5.0.
Use the result as a planning goal
The estimate can help a business understand the scale of a rating goal. It should not be used to pressure customers, request only positive feedback, or create a review-gating workflow.