The standard maximum weight for a single steel-tip dart in most professional darts rules is 50 grams.
Dart weight affects flight, grip and the amount of force needed to reach the board. Players choose different weights within the permitted limit, so there is no single compulsory weight used by every competitor. Many professionals use darts in the broad range of roughly 18 to 30 grams.
The 50-gram limit applies to the complete dart, including its point, barrel, shaft and flight, under common modern steel-tip regulations. Equipment rules can differ between organisations and formats, so a specific competition’s regulations remain authoritative.
Steel-tip darts also differ from soft-tip darts, which are designed for electronic boards and may follow separate equipment rules. Weight alone does not determine scoring: the player’s accuracy and grouping are more important.