Free luthier tool
Viola size calculator.
Violas are measured by body length in inches, not fractions — so the right size depends on your body, not your age alone. Enter your measurements below and get a recommended body length in seconds.
Your measurements
Neck to the middle of the palm, arm held out to the side, palm up.
Thumb tip to little-finger tip, fingers spread wide.
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Awaiting input
Enter age, height and arm length to see your viola size.
Viola size chart.
| Size | Body length | Typical age | Height (cm) | Min arm (cm) |
|---|---|---|---|---|
| 12" | 30 cm | 6–8 | 0–130 | 50+ |
| 13" | 33 cm | 8–10 | 130–140 | 55+ |
| 14" | 35.5 cm | 10–12 | 140–150 | 58+ |
| 15" | 38 cm | 12–14 | 150–160 | 61+ |
| 15.5" | 39.5 cm | 13+ | 160–170 | 64+ |
| 16" | 40.5 cm | 14+ | 170–180 | 67+ |
| 16.5"+ | 42 cm and up | 16+ | 180+ | 71+ |
Guide
Read the full viola size guide
Why viola sizing works differently, and how to judge fit at the shoulder.
Other instruments
Violin & cello size calculator
Fractional sizing for violin and cello, same measurement method.