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Seven white keys and five black keys form an octave. As you already know, now pianos have 88 keys, that is, 7Â¼ octaves. As a rule, there are 52 white keys and 36 black keys on a regular piano. However, not only standard 88 key pianos are used now. Some well-known piano makers produce instruments with different number of keys. For example, there are 92 of them in BÃ¶sendorfer 225, and even 97 keys in BÃ¶sendorfer 290.
Almost every modern piano has 52 white keys and 36 black keys for a total of 88 keys (seven octaves plus a minor third, from A0 to C8). Many older pianos only have 85 keys (seven octaves from A0 to A7). Some piano manufacturers have extended the range further in one or both directions.