Building a KPI widget dashboard might require a stats table depending on the data you'd like to display. 

The KPI widget tip:
https://demo.quickbase.com/db/bpj7nsk6n?a=dr&rid=46&rl=pcn

1. Create a new table in your app. No fields are needed besides the built in ones for now.
2. Create a relationship to the table or tables that you'd like to rollup data about. 

For example - if you'd like to see a KPI on the number of your customers - this new stats table would be the parent to that Customers table. Any existing child of that Customers table would automatically be available to add data to your stats table.

3. To get the number of Customers, for example, add a summary field on your stats table that gets the total of related customers.

Continuing with this example:
4. Add one new record in your Stats table. No data or fields are needed.
5. In your Customers table, if you have existing records, link them all to this new record in your Stats table. An easy way to do this is to up a report with the reference field for that relationship and enter the record ID for that new Stats record into that field for all existing records.
6. To handle new records, in the field properties for the reference field add the record ID as the default value for that one stats table record.
7. Once you are done building, hide this Stats table from the table bar.

TIP: This one Stats table can handle all stats in your app. As long as it's the parent table. Just add another record to grab stats from other tables.