How To Measure A Viola: The Definitive Sizing And Specification Guide
Measuring a viola correctly requires determining the exact length of the instrument's back plate, excluding the neck and button, to ensure player comfort and proper string tension. Unlike the violin, which relies on strict fractional sizes, the viola is measured in inches or centimeters, typically ranging from 15 to 17 inches for adult players.
Essential Preparation and Sizing Equipment
Achieving an accurate viola measurement requires more than simply grabbing a household tape measure. Because violas vary significantly in body length, rib depth, and string stop distance, precision is critical when selecting an instrument for students or professional players.
The physical dimensions of a viola dictate its acoustic resonance, projection, and the ergonomic strain placed upon the player's neck and shoulder. An instrument that is too large can lead to repetitive strain injuries, tendonitis, and poor intonation, while an instrument that is too small may lack the deep, rich timbre characteristic of the alto voice.
- Essential Gear and Tools: A rigid metal ruler or a tailor's cloth measuring tape, a dedicated instrument stand, a soft microfiber cloth to protect the varnish, and a notepad or digital device to record precise measurements in both inches and millimeters.
- Mandatory Prerequisite Standards: Understanding that viola sizes are traditionally expressed in inches (e.g., 15.5 inches, 16 inches) rather than fractions (like a 3/4 or 1/2 violin). Note that the back length measurement strictly excludes the upper neck assembly and the wooden heel button.
- Estimated Budget and Duration: The physical measurement process takes approximately five to ten minutes, requiring zero financial investment if using a standard professional tailors tape.
Step-by-Step Viola Measurement Workflow
Step 1: Secure the Instrument on a Flat, Stable Surface
Place the viola face down on a soft, padded surface, such as a professional violin maker's workbench covered with a clean microfiber cloth or a thick velvet pad. Ensure the bridge and tailpiece are not bearing the weight of the instrument to prevent accidental shifting or damage to the delicate spruce top plate.
Pro-Tip: Always lay the viola down on its back only when working on the pegs or tailpiece, but for measuring the back plate, the instrument must rest securely on its belly with a supportive cradle underneath the neck heel.
Step 2: Locate the Upper Boundary of the Back Plate
Identify the exact point where the wooden neck meets the body of the instrument at the upper bout. Specifically, find the bottom edge of the upper button—the small, semi-circular tongue of wood that extends from the neck heel onto the back plate of the viola.
Warning: Do not place the zero mark of your measuring tape at the very top of the scroll or the top of the neck joint. Including the neck or the button will add up to an inch of false length, resulting in an incorrect size classification.
Step 3: Align the Measuring Tape Along the Center Seam
Extend your rigid ruler or cloth measuring tape straight down the longitudinal center seam of the back plate, running directly from the bottom edge of the upper button down to the lower edge of the bottom rib. Ensure the tape lies completely flat and parallel to the grain of the two-piece or one-piece maple back.
Step 4: Measure to the Lower Edge of the Back Plate
Read the measurement at the exact point where the center seam meets the lower edge of the back plate, just above the endpin. Do not include the protruding wooden saddle or the endpin itself in this final length reading. Record the measurement down to the nearest eighth of an inch or millimeter to establish the definitive instrument size.
Amethyst in Violaceous Made to Measure Mural - Black Crow Studios
Standard Viola Size Matrix and Physical Specifications
| Viola Size Category | Back Length (Inches) | Back Length (Centimeters) | Recommended Player Age / Height | Approximate String Scale (Nut to Bridge) |
|---|---|---|---|---|
| Small Intermediate | 14 inches | 35.5 cm | Ages 9–11 / Height under 4'10" | 340 mm to 350 mm |
| Standard Medium | 15 inches | 38.1 cm | Ages 11–13 / Height 4'10" to 5'2" | 355 mm to 365 mm |
| Medium-Large | 15.5 inches | 39.4 cm | Teenagers / Height 5'2" to 5'5" | 370 mm to 380 mm |
| Standard Full Size | 16 inches | 40.6 cm | Adults / Height 5'5" to 5'9" | 380 mm to 390 mm |
| Large Concert | 16.5 inches | 41.9 cm | Adult Professionals / Height 5'9"+ | 395 mm to 405 mm |
| Orchestral Special | 17 inches + | 43.0 cm+ | Professional Soloists / Height 6'0"+ | 410 mm+ |
Troubleshooting Common Measurement and Ergonomic Discrepancies
- Root Cause: Measuring the total length including the scroll and neck.
- Actionable Fix: Reset the zero marker strictly at the lower edge of the upper back button. Re-evaluate the measurement to ensure it falls within standard commercial size brackets (15 to 16.5 inches).
- Root Cause: Inconsistent sizing due to non-standard instrument designs or historical maker variations.
- Actionable Fix: Complement the back length measurement by checking the vibrating string length (from the interior edge of the nut to the center of the bridge) and the upper/lower bout widths to assess overall ergonomic playability.
- Root Cause: Player experiencing persistent left-shoulder pain despite playing a standard 16-inch viola.
- Actionable Fix: Recognize that rib depth and shoulder width often matter more than back length alone. Transition the player to a "short-scale" or wide-ribbed 15.5-inch viola that projects like a 16-inch instrument without the physical reach burden.
Frequently Asked Questions
Can I use a violin bow or case for a viola?
No, viola bows are heavier and slightly shorter than violin bows, and viola bodies are broader and deeper than violins, requiring specialized cases. Placing a viola in a violin case will damage the bridge, strings, and edges of the instrument.
How do viola sizes correlate to fractional violin sizes?
Viola sizes do not use fractional designations like 3/4 or 1/2. Instead, violas are measured purely by their back body length in inches, ranging typically from 14 inches for small student models up to 17 inches for large professional instruments.
Why do some 15.5-inch violas sound larger than 16-inch violas?
Acoustic volume and tone quality depend heavily on the internal air volume, arching height, and rib depth of the instrument, not just the back length. Master luthiers often design wider ribs on smaller instruments to maximize low-frequency resonance.
What is the most common viola size for adult beginners?
The 15.5-inch and 16-inch sizes are the industry standards for adult players, offering a balance between ergonomic reach and rich alto projection. Players with shorter arm spans should test a 15-inch model to prevent long-term postural tension.
How does string length affect viola playability?
The string stop length—the distance from the nut to the bridge—dictates the physical spacing between notes on the fingerboard. A longer string stop requires wider finger stretches, making careful measurement essential for players with smaller hands.
Consult with a professional luthier or specialized string shop to verify your instrument dimensions and find the ideal ergonomic setup for your playing style today.
