The agreement rate is the percentage of users who placed a card in a certain category in a card sort.

## Single card agreement rate

The single card agreement rate is the percentage of users who decided that a specific card belongs in a category. An agreement rate of 100% means that all testers agreed that a card belongs in a specific category.

### How is the agreement rate calculated?

The agreement rate is calculated using the following equation:

**(count in category * 100) / total tester count**

For instance, consider the example screenshot below:

- The card "Key lime pie" was placed in the category by all 8 of the testers. The agreement rate for that card in that category is 100% (8 * 100 / 8)
- The card "Salted caramel ice cream" was placed in the category by 7 out of 8 testers. The agreement rate for that card in that category is 87.5% (7 * 100 / 8)
- The card "Pastel de nata" was placed in the category by 3 out of 8 testers. The agreement rate for that card in that category is 37.5% (3 * 100 / 8)

## Average agreement rate

The average agreement is calculated as a simple average between the agreement rates of all cards inside a category.

In the example screenshot, the average agreement for the "Desserts" category is 75%, as that is the average of the agreement rates of all cards inside that category.

## Analysis tools

### Agreement matrix

The agreement matrix groups cards under each category based on their highest agreement rates. It gives you a visual representation of how often cards appeared in each category. Learn more

### Similarity matrix

The similarity matrix evaluates the relationship between pairs of cards. It gives you insight into which cards were most frequently grouped together. Learn more

## How many testers do I need?

The number of testers you need depends on the type of research you're running. We recommend testing with at least 20 testers for unmoderated studies and 5–10 for moderated studies.

Learn more about the ideal number of testers

## Card sorting results

To learn more about your card sorting results, check out this article: Understanding your card sorting results