About Card Fit Lab

Card Fit Lab is an independent reference for people choosing trading-card sleeves and storage. Its purpose is practical: make it easier to compare a card, its sleeves and the container they need to fit into.

What we publish

The site combines a free fit checker, a product catalog and buying and sizing guides. Manufacturer specifications and third-party reports are attributed to their sources. Estimates are labeled, and a missing measurement can produce a Not confirmed result.

The word “Lab” describes our approach to comparing dimensions. It is not a claim that we own or have physically tested every product. Read how we check fit for the calculation, assumptions and evidence labels.

Editorial responsibility

Card Fit Lab maintains the catalog, calculation and guides. Product names refer to their respective manufacturers; this site is not operated by those brands. We revise records when a documented correction changes a result. Guide updates show their revision date.

Found a conflicting measurement or an unclear answer? Send a correction with the exact model and source, or copy the setup link from the checker so we can reproduce it.

Affiliate links

Some links to retailers earn a commission from qualifying purchases. You can use the tool and read its sources without buying anything. Affiliate relationships do not change the calculation. Read the disclosure and privacy policy.