5-Star Review Calculator

Current situation

Goal

5/5 reviews needed

0reviews

How to use this calculator?

1. Enter your current average rating (out of 5)
2. Enter the number of existing reviews
3. Set the target rating you want to reach
4. The number of 5/5 reviews needed is calculated automatically

Quick answer

How many 5-star reviews do you need to raise your average rating?

The number of 5-star reviews needed is: (target rating - current rating) × current number of reviews / (5 - target rating), rounded up. Example: to go from 4.2 to 4.5 stars with 150 reviews, you need (4.5 - 4.2) × 150 / (5 - 4.5) = 90 new 5-star reviews. An exact 5.00 average can never be reached.

Current ratingCurrent reviewsTarget rating5-star reviews needed
4.21504.590
4.0504.550
4.1204.516
4.52004.7134
3.5404.020
4.35004.6375

About the 5-Star Review Calculator

What is it?

The 5-star review calculator determines the exact number of perfect reviews (5/5) you need to obtain to reach a target rating on Google, Amazon, Trustpilot or any other platform.

Why use it?

Average rating is a determining factor in purchase decisions. 93% of consumers read reviews before buying. This tool helps you concretely plan your online reputation strategy.

How does it work?

Enter your current rating, your total number of existing reviews and your target rating. The tool precisely calculates the minimum number of 5-star reviews needed using the weighted average formula.

Usage tips

  • The more reviews you have, the more 5-star reviews it takes to move the rating
  • Systematically ask for a review after every successful purchase or service
  • Respond to all your reviews, positive and negative - it's a trust signal
  • Focus on service quality rather than soliciting reviews in bulk
  • A 4.4 rating can be more credible than a perfect 5.0 - perfection raises suspicion
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