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What is t-shirt sizing in Agile?

T-Shirt Sizing in Agile is a relative estimation technique used by teams to estimate the size or complexity of work items (user stories, tasks, features) instead of estimating exact time. Instead of saying “this task will take 5 days”, teams classify work using T-shirt sizes like XS, S, M, L, XL.

T-Shirt Size	Relative Effort	Typical Time Range	Example Task
XS	Very Small	Few hours	Fix typo in UI
S	Small	1 day	Simple UI change
M	Medium	2–3 days	Add validation to form
L	Large	4–5 days	Implement new API endpoint
XL	Very Large	1–2 weeks	Build new module
XXL (optional)	Too big	Needs breakdown	Entire feature

Story points (SPs) measure relative effort, complexity, and risk, while man-days (MDs) measure absolute time (8-hour work days). SPs are used for team velocity and capacity planning, whereas MDs are often used for budgeting and scheduling. While not directly equivalent, organizations sometimes map points to time using historical data (e.g., 1 SP = 1 day).