
The Rules of Golf specify that players must measure a club-length using a standard club, not necessarily the one intended for the next shot. Misconceptions about using different clubs for measuring relief areas are clarified.
Whether it's measuring the teeing area or determining the size of a relief area when you have to drop or place a ball while applying a rule, you might think you have some latitude in terms of what club you use to measure. The Rules of Golf, however, is very specific about what you should do when it's time to measure a club-length.
That shouldn't surprise you. The book tries to leave very little to interpret when you're on the course applying a rule.
A common belief among recreational players is that when measuring the area for a dropâsuch as when your ball is on a cart path or in some unplayable situationâyou must use the club you intend to use for your next shot. Less common, golfers sometimes think a long putter can be used to measure. Imagine the size of the drop area if Bernhard Langer tried to use his 48-inch broomstick putter to measure.
Neither belief is true.
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You should use a standard club, as specified by the Rules of Golf, rather than the club intended for your next shot.
No, using a long putter to measure a relief area is not allowed according to the Rules of Golf.
Measuring a drop area incorrectly can lead to penalties, as the Rules of Golf are strict about how to apply them.
No, the Rules of Golf do not provide exceptions; players must adhere to the specified measurement guidelines.

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A club-length is defined as the length of the longest club the player is using during that round, but it cannot be a putter. The first part of that sentence is as important as the last. If you're not carrying a driver in your bag, you can't borrow your partner's to gain a couple extra inches of relief area. You have to go with your longest club. And putters are never used. (Also, it's important to note that the longest club in your bag cannot exceed 48 inches, otherwise it would be deemed non-conforming.)
Another thing to remember is that the length of the club is measured from the toe of the clubhead to the butt end of the grip and that no attachments (like the Arccos golf sensors) are considered part of it. And you can forget about leaving that big "Caddyshack" gopher headcover on.
These stipulations, btw, were part of the major revisions the USGA and R&A made to the rule book back in 2019. Before then, players could choose any club.
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