The standard height of a standing desk can vary depending on the brand and model, but a good rule of thumb is that the desktop should be at elbow height. This means that your elbows should be at a 90-degree angle when you're standing with your arms at your sides and your hands resting on the desk. For most people, this equates to a desk height of around 42 inches (107 cm).
However, it's important to keep in mind that the ideal desk height can vary depending on your height and body proportions. Some standing desks are adjustable, allowing you to customize the height to your individual needs. It's also important to consider the height of your computer monitor or laptop, which should be positioned at eye level to reduce strain on your neck and shoulders.
When choosing a standing desk, make sure to consider your individual needs and preferences to find the one that's right for you. If you're unsure about the ideal desk height, consider consulting a health professional or ergonomic specialist for personalized advice.