TrustScore and conversion: is there a threshold?
Founders often ask what TrustScore they need before ads and checkout pages start converting. No published study gives a single number for Trustpilot. This guide covers what the research does show, the steps that Trustpilot's own star rounding creates, and how to find the threshold that matters for your brand. We move your score by removing the 1-star reviews that break Trustpilot's rules. You pay per removal.
By James Tumbucon. Published · Updated . Reviewed against Trustpilot’s guidelines on
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Short answer
No published research sets a single TrustScore at which conversions switch on. The strongest evidence, from Northwestern's Spiegel Research Center, is about product ratings: purchase likelihood peaks between 4.0 and 4.7 stars and drops near 5.0. What Trustpilot does create is visible steps, because it rounds the TrustScore to half stars. A score of 4.2 shows 4 stars and 4.3 shows 4.5 stars. Those steps, more than any universal threshold, are what buyers see.
Key facts
No published study sets a single TrustScore at which conversions switch on.
Source: How Online Reviews Influence Sales, Spiegel Research Center, Northwestern University
Northwestern's Spiegel Research Center found purchase likelihood peaks at product ratings of 4.0 to 4.7 and falls as ratings approach 5.0.
Source: How Online Reviews Influence Sales, Spiegel Research Center, Northwestern University
Trustpilot rounds the TrustScore to half stars, so visible steps fall at 3.8, 4.3 and 4.8.
Source: TrustScore and star rating explained, Trustpilot Help Center
Every TrustScore calculation includes 7 neutral 3.5-star reviews, and recent reviews weigh more.
Source: TrustScore and star rating explained, Trustpilot Help Center
What the research says
The most cited study is How Online Reviews Influence Sales from the Spiegel Research Center at Northwestern University. Its findings, in the center's own summary:
| Finding | Detail |
|---|---|
| The rating sweet spot | Purchase likelihood typically peaks at ratings in the 4.0 to 4.7 range, then decreases as ratings approach 5.0 |
| The first reviews matter most | A product with five reviews is 270% more likely to be purchased than a product with none. The benefit of extra reviews falls quickly after the first five |
| Price raises the stakes | Displaying reviews lifted conversion by 190% for a lower-priced product and by 380% for a higher-priced one |
| Who writes matters | Verified buyers give more 4- and 5-star ratings than anonymous reviewers, who are more likely to give 1 and 2 stars |
Limits. The study looked at product reviews on retail sites. It did not study Trustpilot, company-level scores or health services. Use it for direction, not as a target.
Two points carry over well to health brands:
- Perfect is suspicious. A 5.0 with no criticism reads as curated. That is a reason to stop chasing every negative review, and it matches Trustpilot's rules, which keep genuine criticism online.
- Higher prices raise the importance of reviews. A multi-month treatment plan is a considered purchase. Expect your Trustpilot profile to matter more than it would for a $20 product.
The thresholds Trustpilot itself creates
Buyers rarely read the decimal. They see stars, in your ads, widgets and search results, where Google calls them a review snippet.
Trustpilot says the TrustScore is shown as a star rating from 1 to 5, including half stars. It uses standard mathematical rounding to reach a half or full star. With a TrustScore displayed to one decimal, that rule produces these steps:
| TrustScore shown | Stars displayed |
|---|---|
| 4.8 to 5.0 | 5 |
| 4.3 to 4.7 | 4.5 |
| 3.8 to 4.2 | 4 |
| 3.3 to 3.7 | 3.5 |
| 2.8 to 3.2 | 3 |
| 2.3 to 2.7 | 2.5 |
This table is our calculation from the rounding rule. Trustpilot does not publish it in this form.
The practical result: moving from 4.2 to 4.3 changes what people see, from four stars to four and a half. Moving from 4.3 to 4.6 changes nothing visible. If you are going to set a target, set it at the next step above your current score.
Thresholds set by where the stars appear
A second kind of threshold comes from the places your rating is displayed.
Search results. Trustpilot's review labels article explains which reviews count toward Google's store ratings. Reviews collected through automatic invitations and invitation links count. Organic reviews and reviews through a basic profile link do not. A brand that never invites may have plenty of reviews and still none that feed those ratings.
Consumer Warnings. If Trustpilot places a Consumer Warning on a profile, the TrustScore is hidden and Trustpilot stops sharing rating data with search engines. For conversion purposes that is a drop to no score at all. See the Consumer Warning guide.
What actually moves a TrustScore
Trustpilot's formula uses three factors:
- Time span. Newer reviews weigh more than older ones.
- Frequency. The score is most stable when reviews come in regularly.
- Average. Every calculation includes 7 neutral 3.5-star reviews, which matter less as real reviews add up.
It ignores whether a review was invited or organic, and whether the business pays Trustpilot. Only a customer's most recent review counts. Profiles under 10,000 reviews recalculate at once.
What follows from that:
| Action | Effect on the score |
|---|---|
| Remove recent rule-breaking 1-star reviews from a small profile | Large |
| Remove old rule-breaking reviews from a large profile | Small |
| Start fair invitations to every customer | Large and lasting, because new reviews carry the most weight |
| Fix the cause of a repeating complaint | Builds over months, as fewer new 1-star reviews arrive |
Median TrustScores by health category are in our DTC health Trustpilot report 2026. In our September 2026 sample of telehealth profiles, one brand with a 39% share of 1-star reviews still showed a TrustScore of 4.1. Recent invited reviews outweighed the older complaints. See why telehealth brands get more 1-star reviews.
How to find your own threshold
A number borrowed from someone else's study will not tell you what your buyers do. Your own data will.
- Record your TrustScore and star display every week, next to your landing page conversion rate.
- Note every half-star change. Those are the natural experiments.
- Test the widget. Compare pages with and without the Trustpilot widget at your current score. At 3.5 stars, showing the widget may cost you. At 4.5, it may help.
- Segment by price. Expect a larger effect on multi-month plans than on one-time orders.
- Give it time. Review effects are slow. Compare months, not days.
Where removal fits
Removal is one input. It takes out reviews that should not be on the profile under Trustpilot's own rules. It does not replace invitations or fixing real problems, and we do not promise any score or any conversion result.
If your score sits just below a star step, the first question is how many of your recent 1-star reviews break a rule. The free audit answers that. The main Trustpilot review removal page explains what removal does to the formula.
For help with your own profile, start with our Trustpilot review removal service. Our review removal pricing is per confirmed removal, with nothing up front.
Frequently asked questions
There is no published threshold specific to Trustpilot. The best-known study of ratings and purchases comes from Northwestern University's Spiegel Research Center. It found that purchase likelihood peaks when average ratings are between 4.0 and 4.7, and falls as ratings approach 5.0. That study looked at product ratings on retail sites, not TrustScores. Source: Spiegel Research Center.
They are two views of one number. The TrustScore is shown to one decimal, such as 4.3. The Trustpilot rating is the row of stars from 1 to 5, including half stars, that the score rounds to. So a 4.3 TrustScore shows as a 4.5-star rating. Recent reviews count for more in the score than old ones. Source: TrustScore explained.
Trustpilot rounds the TrustScore to the nearest half star using standard rounding. With a score shown to one decimal, the steps fall at 3.8 for 4 stars, 4.3 for 4.5 stars and 4.8 for 5 stars. This is our calculation from Trustpilot's stated rounding rule. Source: TrustScore explained.
It depends on how many reviews you have, how recent they are, and how fast new ones arrive. Recent reviews weigh more, and every calculation includes 7 neutral 3.5-star reviews. On a small profile a few removals can move the score. On a profile with thousands of reviews they will barely show.
Not according to the Spiegel research, which found that purchase likelihood drops as ratings near 5.0 because shoppers see a perfect score as too good to be true. A profile with real criticism and good replies can be more convincing than a perfect one.
We do not claim that. Removing rule-breaking reviews can raise a TrustScore, and a higher score can change the stars that buyers see. Whether that changes your conversion rate depends on your traffic, price and offer. Measure it on your own pages.
Primary sources used on this page
- How Online Reviews Influence Sales. Spiegel Research Center, Northwestern UniversityLast verified
- TrustScore and star rating explained. Trustpilot Help CenterLast verified
- Trustpilot's review labels. Trustpilot Help CenterLast verified
- Action We Take. TrustpilotLast verified