How are my earnings from Adoptables and Exclusives calculated?

Your earnings from Exclusives will vary, as the platform fee for Exclusives you’ll face depends on the Core Membership you have. (Adoptables are a category of Exclusives, so the same platform fee will apply.) To access your earnings, hover over your avatar in the site navigation, and click Earnings.

What happens if my Core Membership expires during the sale of an Exclusive?
Deviants whose Core Membership lapses after listing an Exclusive for sale won't be able to list new Exclusives (or re-list Exclusives they previously accepted offers on), and will incur DeviantArt’s standard 20% platform fee when the sale ends. Learn more about what happens when your Core lapses.
What happens if I upgrade my Core Membership during the sale of an Exclusive?
For fixed-price Exclusives, platform fees will apply to the Core package held when it is purchased.

For offer-based Exclusives, platform fees will be calculated based on the Core package held at the time of the listing. 
A processing fee will be applied to transactions involving a third-party payment processor (such as credit cards, PayPal, or digital wallets).