Fret Scale Rule

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Fret Scale Rule Gibson guitar rule

Gibson guitar rule

Item # 0800
In stock, ready to ship!


Fret Scale Rule Fender / PRS / classical rule

Fender / PRS / classical rule

Item # 0801
In stock, ready to ship!


Fret Scale Rule Martin / mandolin / banjo rule

Martin / mandolin / banjo rule

Item # 0802
In stock, ready to ship!


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Fret Scale Rule

Determine fret spacings and layout fretboards accurately.

"Before working on any vintage guitar, I always check fret accuracy with these rules."
—Dan Erlewine

Our accurate, high quality 22" x 1-1/4" x .030" rules, crafted of durable stainless steel for years of service in professional repair shops. Each rule has four different fret scales, and features precisely etched, easy-to-read markings on both sides.

#0800 Gibson guitar rule
This rule includes Gibson's long scale and three shorter Gibson scales. The three shorter scales are different lengths, but over the years Gibson has referred to all of them as 24-3/4". For more detailed information, see

  • 24.562" Gibson (24-9/16")
  • 24.625" Gibson (24-5/8")
  • 24.750" Gibson (24-3/4")
  • 25.300" Gibson long

#0801 Fender / PRS / classical rule
  • 25.5" Fender
  • 25" PRS / Dobro® / National™ / Benedetto
  • 650mm classical
  • 660mm classical

#0802 Martin / mandolin / banjo rule
  • 24.900" Martin short
  • 25.340" Martin long*
  • 13-7/8" mandolin
  • 26-3/16" banjo
*Martin long scale: The scale used on Martin Dreadnoughts is commonly referred to as 25.4" but is actually 25.34".

Product Instructions

Fret Scale Rule Instructions

Tips for using our fret scale rules for building and repairing guitars, mandolins, and banjos.

Customer Reviews

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  • 4.71 average rating from 14 reviews
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(Customer's Reviews)

It has various rules as described:24.562 , 24.625 , 24.750, 25.300

It is very useful to measure and also to cut. Very accurate! Good material.

Gibson rules. No more guesses!



(Customer's Reviews)

Very accurate...draw your fret without any guesswork!!


Fret scale rule... what else?

(Customer's Reviews)

While these rules work fine for checking fret positioning, that's all they do. Frankly, they could have been made just a tad longer and include saddle position with correct compensation. With this addition it would make a very good and complete measuring tool, like the old IBEX scale rule.


Fret Scale Rules, a powerfull tool

(Customer's Reviews)

Aside from checking vintage fret spacing, check all NEW necks, especially replacement necks, for correct fret spacing. Yes, I have spent hours carefully measuring fret spacing on replacement necks and found the spacing incorrect. These necks will never play in tune. Save yourself time and money by quickly and accurately confirming correct fret spacing on all necks before investing your skills on a neck that will never play correctly.

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