Guide to Acoustic Guitar Frets and Fret Sizes

Fret Measurements and What They Mean

Acoustic guitar frets are specified by two dimensions: width (measured across the top of the fret, perpendicular to the fretboard grain) and height (measured from the fingerboard surface to the top of the fret crown). Standard acoustic fret wire ranges from approximately 0.079 inches wide by 0.039 inches tall at the narrow end, up to 0.110 inches wide by 0.058 inches tall at the wide end. Martin guitars traditionally use smaller frets (around 0.078 x 0.043), Taylor uses medium frets (approximately 0.088 x 0.043), and some Gibson acoustics use taller 'jumbo' frets closer to 0.100 x 0.057.

The two most common reference standards in the industry are Dunlop 6150 (0.102 x 0.042) and Dunlop 6230 (0.079 x 0.039). Jescar, another major fretwire manufacturer, uses similar sizing with their FW55090 (medium-jumbo) and FW43080 (Martin-standard) being the most common. These are the same wire profiles used in the factory installations on most major brands, so if you know which wire your guitar came with, you can order exact replacements for refrets or repairs.

How Fret Size Affects Playability

Taller frets (0.050 inches and above) require slightly less downward pressure to fret a clean note, because the string does not need to contact the fingerboard surface behind the fret, it only needs to rest firmly against the fret crown. This makes taller frets easier for bending notes and for players with lighter fretting-hand strength. Shorter frets (0.040 inches and below) require more precise fingertip placement but produce a slightly more direct tonal connection between the string and the fingerboard wood. Martin's traditional small frets are part of the reason Martin acoustics have their specific feel and response characteristics.

Wider frets produce more tonal stability across the fret crown, as the string moves slightly against the fret during vibration, a wider contact area reduces the chance of rattle or buzzing. Narrower frets offer more precision and slightly better intonation accuracy because the contact point is more clearly defined. For most players, medium frets (0.090-0.100 x 0.045-0.055) represent the best balance and are used on Taylor 800-series, Gibson J-45, and many Collings instruments. Martin's traditional small frets suit players who value vintage feel and tonal character over modern bendability.

Fret Wire Materials

Nickel-silver alloy (actually containing no silver, typically 18% nickel, 65% copper, 17% zinc) is the traditional fret wire material and is used on roughly 95% of acoustic guitars. It has good machinability, acceptable wear resistance, and produces a warm, slightly compressed tonal response. Stainless steel fret wire has become more common since 2015, particularly on premium Taylor models and custom builds. Stainless frets last 3-5x longer than nickel-silver before needing leveling or replacement, and they produce a slightly brighter, more articulate tone.

The trade-off with stainless steel is that it is harder to work, refrets and crown levels on stainless frets take roughly twice as long as nickel-silver work and wear out files quickly. Expect to pay a $75-150 premium for stainless fret work versus nickel-silver. For players who play 4+ hours daily, stainless steel pays back the initial investment within 3-5 years through reduced refret costs. For weekend players, standard nickel-silver is the more economical choice. EVO Gold (Jescar's copper-tin alloy) is an emerging middle ground, harder than nickel-silver but easier to work than stainless, with a distinctive gold color.

How Frets Wear and When to Replace Them

Frets wear from string contact, and the wear patterns are predictable. The 1st through 5th frets wear fastest because open-position chords spend most playing time there. The 3rd fret on a wound G string (on a guitar tuned in standard tuning) is often the first to develop a visible groove, followed by the 5th fret on the wound D string. Wear on higher frets (above the 12th) is usually light because those frets see much less playing time. A typical acoustic with 200-300 hours of annual playing will show visible wear on the first five frets within 4-6 years.

Signs that frets need attention: notes that sound dead or choke out when bent, intonation that cannot be corrected at the bridge, visible grooves deeper than about 0.5 mm on any fret, or a fretboard that shows obvious height variation under a straight edge. The appropriate repair depends on wear severity. Minor wear can be corrected by a crown level and polish ($120-220). Severe wear or multiple dead-note frets require a full refret ($300-500 for nickel-silver, $450-700 for stainless). A full refret is a significant investment but typically restores the guitar to better-than-new playing condition.

Fret Size Recommendations by Playing Style

For traditional fingerstyle players who prefer a vintage Martin feel, small frets (0.079 x 0.043, Dunlop 6230 or Jescar FW43080) are the natural choice. They produce the direct tonal connection and precise note placement that classical-influenced fingerstyle depends on. Players like Chet Atkins, Tommy Emmanuel in his traditional mode, and most classical crossover players favor small frets because of how they feel under pressed fingers at the 7th-12th fret range where most lead work happens.

For strummers, blues players, and singer-songwriters who spend most time in open positions, medium frets (0.090-0.100 x 0.045-0.055, Dunlop 6150 or Jescar FW55090) are the correct default. The slightly taller profile makes chord fretting easier on fatigued hands during long sessions, and the wider crown reduces string rattle on hard strumming. This is the size most factory Taylors, Gibsons, and boutique builders use, and it suits the widest range of playing styles. Jumbo frets (0.100 x 0.058) suit players coming from electric guitar who are used to the taller profile of Gibson Les Paul frets, but they can feel oversized for traditional acoustic playing.

Choosing between small and medium frets is mostly a matter of personal preference and playing history. Players accustomed to Martin acoustics typically prefer small frets; players accustomed to Taylors or Gibsons typically prefer medium frets. Neither is universally better, both can produce excellent playability in the right hands.