To answer clearly: the question “how tall is” is incomplete. Tallness depends on what you’re referring to (a person, a object, or a population average) and in what context (adult height, child height, specific country or group). If you can specify what you want to know, provide any relevant details (e.g., “average adult height in Japan,” “height of a standard doorway,” or “your height in cm compared to population percentiles”), and the answer can be precise. If you’re aiming for general context:

• Average adult human height varies by country and sex. For example, many populations have average heights roughly in the 160–180 cm range, with men typically taller on average than women in the same population. Precision depends on the dataset and year of measurement.

• For quick, personal estimates, people often use height percentiles to see how tall they are relative to their peers, which requires age, sex, and country for accuracy.

Please provide the specific subject and scope you want, and I’ll give a direct, precise answer.