What is t-shirt sizing?

T-shirt sizing — this is a method of estimating the scope of work or task complexity that uses T-shirt sizes (XS, S, M, L, XL, etc.) instead of precise numerical values. This approach helps quickly and intuitively estimate tasks during planning or roadmap formation, especially when detailed calculation is difficult or unnecessary.

For example, a team might estimate a new feature as "M" — a medium size, indicating medium complexity and development time. This simplifies communication and helps prioritize tasks without excessive detail.