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Preparing your review management experience.
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Preparing your review management experience.
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Preparing your review score forecasting tool.
Calculate exactly how many 5-star reviews you need to reach your target rating. Get instant pricing estimates for Trustpilot, G2, Google, and more.
Calculate how many reviews you need to improve your Trustpilot TrustScore
Pro tip: Most top businesses target 4.5–4.6 stars — it's the sweet spot for trust & conversions, and looks more natural.
Need a deadline-based execution plan? Use the Review Velocity Planner.
Understanding the formulas platforms use to calculate your rating helps you plan your review strategy more effectively.
Most platforms use a straightforward arithmetic mean. They sum all star points and divide by total reviews.
4.6★ from 100 reviews → target 4.8★ → need 100 new 5-star reviews
Trustpilot adds 7 phantom reviews at 3.5 stars to prevent artificial scores. This means new businesses start at 3.5, not 0.
Trustpilot requires more reviews than other platforms to reach the same target because of the Bayesian dampening.
A side-by-side look at how each platform handles ratings, pricing, and delivery.
| Platform | Scoring Method | Price / Review | Delivery |
|---|---|---|---|
| Trustpilot | Bayesian (7 phantom) | $20–25 | 7–14 days |
| Simple Average + Rounding | $18–20 | 7–14 days | |
| G2 | Simple Average | $28–30 | 7–14 days |
| Yelp | Filtered Average | $20–22 | 7–14 days |
| TripAdvisor | Weighted Recency | $22–24 | 7–14 days |
| Google Play | Simple Average | $6–8 | 3–7 days |
Google rounds displayed ratings to the nearest tenth (e.g., 4.95 → 5.0). Yelp filters reviews algorithmically, so not all reviews count toward the displayed score. Trustpilot's Bayesian model means new businesses need more reviews to move their score.
Knowledge and strategies to optimize your online reputation.
A TrustScore is the average rating displayed on review platforms like Trustpilot, G2, Google, and others. It's calculated by averaging all star ratings from your reviews. For example, if you have ten 5-star reviews and five 3-star reviews, your TrustScore would be approximately 4.3 stars.
Your TrustScore directly impacts customer trust, conversion rates, and search rankings. Studies show that businesses with ratings above 4.5 stars see up to 270% higher conversion rates compared to those below 3.5 stars.
Our review score calculator uses a proven mathematical formula to determine exactly how many 5-star reviews you need to reach your target rating:
The formula accounts for the weighted average of your existing reviews, ensuring accurate calculations for Trustpilot, G2, Google, Yelp, TripAdvisor, and Google Play.
Once you know the total reviews needed, convert that target into daily and weekly pacing with the review velocity planner.
Common questions about the TrustScore Calculator. Use the Review Velocity Planner to build an execution timeline once you know your review target.
The TrustScore Calculator uses a mathematical formula to determine how many 5-star reviews you need to reach your target rating. It factors in your current rating, total number of reviews, and desired target rating to calculate the exact number of reviews required.
Yes, our calculator works for Trustpilot, G2, Google, Yelp, TripAdvisor, and Google Play. Each platform uses a 5-star rating system, and our formula accurately calculates the reviews needed. We even account for Trustpilot's unique Bayesian averaging system.
The number of reviews needed depends on your current rating and total review count. Use our TrustScore Calculator to input your specific numbers and get an instant, accurate calculation of reviews needed to reach 4.5 stars or any target rating.
Research shows that 4.5–4.6 stars is the sweet spot. Ratings above 4.7 can actually appear suspicious to consumers. A 4.5–4.6 rating signals 'Excellent' on most platforms, maximizes conversion rates, and is significantly more cost-effective to reach than 4.8 or 4.9.
Google rounds displayed ratings to the nearest tenth. For example, a true average of 4.95 would display as 5.0, while 4.94 would show as 4.9. This rounding can work in your favor — you might need slightly fewer reviews than the mathematical formula suggests to visually reach your target.
Pricing varies by platform and package size. Trustpilot reviews start at $20 per review, G2 reviews at $29–30, Google reviews at $18–20, and Google Play reviews at $6–8. Larger packages offer better per-review pricing.
View all pricing packages →