The studio piano size ranges from 45″ to 47″ tall (115cm-117cm). It has it’s roots as the “school choir” piano – ruggedly built for institutional use, tall enough to deliver substantial bass and yet short enough to be seen over (thus the choir piano where the conductor would often accompany from the piano). Today, this same size exists but more as a mid-sized piano. Studio pianos are a generous step up from console piano and usually contains a full-sized action. Smaller pianos have smaller action parts while taller, larger instruments have bigger action parts. The action enables control of the keys and subsequent expression of tone. Generally, the smaller the piano, the more difficult the action is to control (see our Article on Why Upgrade to a Professional Level Piano). The studio piano usually is the smallest piano with a full-sized upright action inside. This is one of the delineating factors that separate Console from Studio. As well as action size, quite often the keys themselves are slightly longer in a studio piano compared to a console. This again aids in the overall expression of the instrument. Most manufacturers make studio pianos and they are represented in a variety of finishes and styles.
For more information on piano sizes, please refer to the Piano Price Point article Piano Sizes ~ What Should I Buy?