Walk-in tubs come in various sizes to accommodate different bathroom layouts and user needs. Standard sizes range from 52 to 60 inches in length and 30 to 32 inches in width, though compact and oversized options are available.

Standard walk-in tubs measure around 52–60 inches long and 30–32 inches wide. Compact options, typically 36–40 inches long, are ideal for smaller bathrooms, while larger models, up to 36 inches wide, cater to those needing more space. The height of most tubs is around 38–46 inches. Some tubs are designed to replace standard bathtubs, while others can fit into smaller or specially designed bathroom spaces.