A "standard" can vary from country to country and even throughout the US. Many overseas counties and even some US Cities have much smaller sized rooms.
So generally speaking and commenting about the US only, a bedroom can be as small as 4x8 feet or 5x7 feet and larger sizes from there. Master Bedrooms or whichever is the "primary" bedroom in the house are usually 8x10 feet or in increasing sizes. Living Rooms also vary---some narrow but long; others wider than length; some more proportional, and can be fairly small to extremely large. An average might be 8x10 feet up. Every house, especially in older homes across the US, modifications can alter room size with just adding a wall or knocking one down!
Plus, ceiling heights affect the sense and actual overall room size. For example, bedrooms under roof eaves have slanted walls on one or more sides. This can reduce the overall size and usefulness of a room, making less wall space and therefore less space to place furniture. For example, you wouldn't want to put the head of a bed right under an eave unless it's for a younger child---or you'll bang your head every morning! In what would be considered a "large" US room, ceiling heights can be 9-10 feet high. But... in mansions and higher priced homes, you'll often find cathedral ceilings, at least in the foyer if not throughout the first level of the house.
10/10
There is no standard for the size of a dressing room.
The standard size of a utility room in a house is 4 feet by 6 feet. This varies greatly depending on the overall size of the house.
12by 16
27m2
There is no accepted standard laundry rooms size just as there is no standard sizes for kitchens or baths.
650sft/room
1:1.5
Depends on the size of the rest of the house.
A hotel lobby does not have a standard size
10 x 19
A comfort room does not need to be very large. The stand size room is usually around 7 x 7 feet.
Measure it yourself kunt