According to badminton regulations, what is the permitted weight range of a shuttlecock?

According to badminton regulations, a shuttlecock must weigh 4.74–5.50 grams.

The shuttlecock, also called a birdie, has a rounded cork or synthetic base and a conical skirt. Traditional feathered versions use sixteen goose or duck feathers arranged around the cork. Its carefully controlled mass helps it travel predictably after being struck by a racket.

The weight range applies to regulation shuttlecocks used in organized play. Shuttlecocks that are too light or too heavy can affect speed, flight stability, and the amount of force needed for clears, smashes, and defensive shots.

A common mix-up is confusing a shuttlecock’s weight with its speed rating. Speed ratings indicate how quickly a shuttlecock travels under standardized testing conditions, while weight is a separate specification. Feathered and synthetic shuttlecocks may feel different in flight even when they meet the required weight range.