Decision path
Check the item, the specification, and the competition
- Identify the ruleset. This page uses the standard BWF Laws of Badminton, not a recreational outdoor format or a manufacturer's product description.
- For a racket, check the overall frame, the stringed area, the string pattern, and any attached object or shape-changing device.
- For a shuttle, identify whether it is feathered or non-feathered, then apply the construction, size, weight, and flight requirements for that type.
- If shuttle speed is disputed, use the BWF test stroke and landing zone rather than judging only by the number printed on a tube.
- Check event regulations and the referee's instructions for the model and speed selected for that competition.
- If compliance remains genuinely disputed, Law 5 makes BWF—not a player, retailer, or manufacturer—the final rules authority.
Scope
“Equipment” covers more than personal preference
Laws 2–5 deal with the shuttle, shuttle-speed test, racket, and equipment compliance. “Shuttlecock” is the familiar everyday name; the BWF Laws use “shuttle.” Law 1 separately specifies the court, posts, and net. Clothing, advertising, medical supports, player accessories, and event-supplied equipment may also be controlled by competition regulations even when they are not dimensions in Laws 2–5.
This distinction matters. A racket can satisfy Law 4 yet still raise a separate event issue, such as an unauthorised advertising mark or attached electronic object. Conversely, a familiar club product is not automatically approved for every BWF-sanctioned competition simply because it is sold as badminton equipment.
Racket frame
The maximum overall size is 680 mm by 230 mm
BWF Law 4.1 describes the racket as a frame no more than 680 mm in overall length and 230 mm in overall width. Its named parts are the handle, stringed area, head, shaft, and, if present, throat. The law does not require a separate throat, which allows common one-piece and throatless designs.
The limits apply to the complete frame's overall dimensions, not just the head. A racket does not receive extra length because part of it is the handle or extra width because a projection sits outside the normal head shape.
Stringed area
The hitting surface must be flat and crossed
The stringed area must be flat and formed by crossed strings, either alternately interlaced or bonded where they cross. Its ordinary maximum size is 280 mm in overall length and 220 mm in overall width.
The Laws regulate the shape and extent of the string bed, but do not set a universal string material, gauge, colour, or tension. A manufacturer or stringer may set a recommended tension for safety and warranty purposes; that recommendation is not itself a BWF playing-law limit.
Extended strings
A narrow extension into the throat has its own limits
Strings may extend into the area that would otherwise be the throat. When they do, the extended portion may be no wider than 35 mm and the stringed area's total length may be no more than 330 mm.
This is a specific exception to the ordinary 280 mm length limit. It does not increase the 220 mm maximum overall width of the stringed area or the racket frame's 680 mm by 230 mm outer limits.
Attachments
Only limited, purpose-specific additions are allowed
Law 4.3.1 requires the racket to be free of attached objects and protrusions except items used solely and specifically to prevent wear, reduce vibration, distribute weight, or secure the handle to the player's hand with a cord. Even an item serving one of those purposes must be reasonable in size and placement.
Protective tape, a modest vibration-control item, balancing weight, or a safety cord can therefore fall within the allowance. A decorative projection, unrelated accessory, or multifunction electronic attachment is not automatically legal. When a new device does not fit the stated exceptions, an event official should not invent an approval; Law 5 provides the compliance route.
Shape-changing devices
The player cannot materially change the racket's shape
Law 4.3.2 prohibits a device that makes it possible for a player to change the racket's shape materially. The provision is technology-neutral: it applies to the function of the device rather than naming a particular material or mechanism.
Normal flex during a stroke, ordinary restringing between uses, and choosing grip or balance are not the same as carrying a device that allows a material shape change. A borderline prototype is a compliance question for BWF under Law 5.
What Law 4 does not specify
There is no universal BWF racket weight or tension limit
The Laws set maximum dimensions and construction restrictions but do not state a minimum or maximum racket weight, a balance point, a shaft stiffness, a grip size, or a string-tension range. Product labels such as 3U or 4U and tension figures are equipment specifications, not categories created by Law 4.
That freedom does not override safety, event, advertising, or compliance rules. It simply means a racket is not illegal under Law 4 merely because it is heavier, lighter, more head-heavy, or strung tighter than another legal model.
Feathered shuttle
A standard feather shuttle has 16 feathers
Under Law 2.2, the 16 feathers are fixed into the base and measure 62–70 mm from tip to the top of the base. Their tips must form a circle 58–68 mm in diameter, and the feathers must be firmly secured with thread or another suitable material.
The base must be 25–28 mm in diameter and rounded on the bottom. The complete shuttle must weigh 4.74–5.50 g. These are ranges, not one mandatory target measurement, so two legal shuttle models need not be identical.
Materials
The Laws permit natural, synthetic, or mixed materials
Law 2.1 permits a shuttle made from natural and/or synthetic materials. Whatever material is used, its general flight characteristics must resemble those of a natural feathered shuttle with a cork base covered by a thin layer of leather.
That functional flight standard is important: material alone does not decide legality. “Feather” is not the only legal category, and “plastic” is not automatically suitable for regulated competition. The finished shuttle must satisfy the applicable construction and flight requirements.
Non-feathered shuttle
A synthetic skirt replaces the natural feathers
For a non-feathered shuttle, a skirt or synthetic simulation replaces the feathers. The base retains the feather-shuttle requirement: 25–28 mm in diameter and rounded on the bottom.
The feather-length, tip-circle, and total-weight specifications also apply, but Law 2.3 allows variation of up to 10 per cent because synthetic materials have different specific gravity and other properties. That tolerance belongs to the listed non-feather measurements; it is not a general permission to depart from every shuttle rule.
Altitude and climate
Local conditions can justify an approved modification
Air density, temperature, and altitude affect shuttle flight. Law 2.4 therefore permits modifications to the stated specifications where atmospheric conditions make the standard shuttle unsuitable, provided there is no variation in the general design, speed, and flight.
This is not a player-by-player exception. The modification requires approval from the Member Association concerned—the national governing association affiliated to BWF. Clubs and players should use the shuttle chosen under the applicable competition arrangements rather than privately altering one.
Speed test
Test shuttle flight from one back boundary toward the other
Law 3 provides a repeatable court test. A player uses a full underhand stroke, contacts the shuttle over the back boundary line, and sends it upward in a direction parallel to the side lines.
A shuttle of correct speed lands 530–990 mm short of the opposite back boundary line, within the testing area shown in BWF Diagram B. The test assesses actual flight in the venue; the speed marking on packaging is useful selection information but does not replace the Law 3 result.
Changing a shuttle
Wear does not let a player alter the shuttle for advantage
Normal play can damage feathers and change flight. In an officiated match, players should present a disputed shuttle to the umpire and follow the competition's shuttle-change procedure rather than substituting one unilaterally. The umpire controls the match, while the referee has overall tournament authority.
Law 16.6.2 separately prohibits deliberately modifying or damaging a shuttle to change its speed or flight. Tipping feathers, squeezing the skirt, or otherwise tampering for a preferred pace is therefore misconduct, not an informal alternative to selecting or testing the proper shuttle.
Broken shuttle
Complete separation during a rally creates a let
If the shuttle disintegrates during play and its base completely separates from the rest of the shuttle, Law 14.2.4 makes the rally a let. Play since the last service does not count and the same server serves again with a suitable shuttle.
A bent feather, cracked skirt, wobble, or partial damage is not automatically this specific let. The law's test is complete separation of the base from the remainder during play. Other damage is handled through the officials' control of play and the applicable shuttle-change procedure.
Compliance authority
BWF decides unresolved equipment legality
Law 5 authorises the Badminton World Federation to rule on whether a racket, shuttle, other playing equipment, or prototype complies with the specifications. BWF may act on its own initiative or consider an application from a party with a genuine interest.
The law expressly includes players, technical officials, manufacturers, Member Associations, and their members among possible applicants. A brand claim, retail listing, or use in a casual game does not replace a BWF compliance ruling when one is required.
Para badminton
Wheelchairs and crutches are additional playing equipment
Law 5.2 allows a wheelchair or crutch in Para badminton. A player's body may be fixed to the wheelchair with an elastic belt, the chair may have supporting wheels extending beyond the main wheel, and the player's feet must be fixed to the footrest.
Those provisions supplement the racket and shuttle laws. Para badminton also contains class-specific court, service, movement, and fault rules, so Law 5.2 should not be treated as a complete guide to a Para badminton match.
Practical examples
Apply the specification that matches the question
- A 690 mm racket: it exceeds the 680 mm overall-length limit and does not comply with Law 4.
- A 675 mm racket with an oversized string bed: fitting the outer frame limit does not cure a stringed area that exceeds its separate limits.
- A modest strip of balancing tape: it can fit the attached-object exception when it is solely for weight distribution and is reasonable in size and placement.
- A synthetic shuttle: it is not illegal merely because it lacks natural feathers; its construction, measurements, tolerance, and general flight still have to comply.
- A shuttle labelled “slow” that fails the court test: the label does not overrule the measured flight in Law 3.
- The cork separates completely in a rally: call a let under Law 14.2.4 rather than awarding the point from the later landing.
Common mistakes
Misunderstandings to avoid
- “Only feather shuttles are legal” is too broad. BWF Law 2 expressly provides for non-feathered shuttles.
- “Any store-bought badminton racket is competition legal” is not a rules test. Its dimensions, string bed, attachments, and devices must comply.
- “The BWF maximum string tension is 30 lb” confuses product guidance with the Laws. Law 4 states no universal tension limit.
- “Every damaged shuttle produces a let” overstates Law 14.2.4. Its automatic disintegration let requires complete separation of the base.
- “Players may tune shuttle speed themselves” conflicts with the ban on deliberate modification or damage to change speed or flight.
- “A 10 per cent tolerance applies to every shuttle dimension” is wrong. Law 2.3.3 applies it to specified non-feather measurements and weight because of synthetic-material properties.
Official references
Source material