The Martin D-28 Acoustic Guitar Dimensions
Body: 20 x 15.6 x 4.87 inches
Martin's D-28 acoustic is a traditional dreadnought body shape, with a thicker waist and rounded upper bout (widest part of the body). Its body is fairly large at 20 inches long (horizontal) and about 16 inches wide at the widest part of the body.

This page covers the Martin D-28 acoustic guitar dimensions, including the body and neck. As always, it's essential to remember that these measurements are approximations. Factors such as the hand-crafted aspects of the guitar, environmental influences on wood, and even slight manufacturing variances can affect these dimensions. Despite the variables, we can still provide some accurate numbers for the D-28's size and structure.

Dimensions for the Martin D-28 acoustic guitar body.
Body Dimensions
- Body Length: Approximately 20 inches.
- Body Width: Around 15.625 inches at its widest point on the upper bout.
- Body Depth: Roughly 4.875 inches.
The D-28's body is a dreadnought design, which is the most common acoustic guitar shape. But it's also larger than a concert acoustic, with a thicker waist and larger upper bout (the widest part of the body).
Neck Dimensions
- Scale Length: 25.4 inches, which is typical for many full-sized acoustic guitars.
- Nut Width: About 1.75 inches (width at the end of the 1st fret).
- Fretboard Radius: Not explicitly mentioned in the product copy, but typically Martin guitars have a radius of around 16 inches.
The scale length and nut width of the D-28 are standard for full-sized Martins, and will feel familiar to those who have played Martin acoustics.
Importance of These Dimensions
- Body Size: Affects the D-28's volume and tonal characteristics. Larger body guitars like the D-28 typically produce a louder, more resonant sound with rich bass frequencies.
- Neck and Scale Length: These dimensions impact the playability, string tension, and overall "feel" of the neck.
- Overall Design: The D-28's dreadnought shape will produce a powerful, rich tone with a strong bass presence, making it a good fit for rhythm-focused styles.
Variability in Dimensions
- Natural wood properties/environmental factors: These can cause very minor changes in size and shape over time.
- Hand-assembly and manufacturing process: More hands-on work involved in manufacturing (common with high-end Martin acoustics) might result in slight differences between individual guitars.
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