That depends a great deal on the type and size of tub as well as on how deep you fill it. Most people are not going to fill the tub up as much for small children as they will for an adult and a really big and fat person cannot put as much water into the tub as a short, skinny person (unless they want the tub to overflow).
Typical bathtubs used in the USA can hold 40 to 60 gallons of water - but if you fill them to the top you will overflow the water when you get in.
Depends on the bathtub.
Depends on the size of the tub. Not all tubs are the same size.
You would measure the water in a bath tub in gallons.
Gallons
Only if the bathtub has a capacity of 45 gallons.
over 45,000 gallons per year
it holds approximatley 38.572 L
gallons unedeadknight:Liters.
30 gallons
gallons
A bath can generally be of 100 liter, 150 liter or 200 liter capacity. The Biblical volume measure of a Bath (as used in 1 Kings 7 to describe the capacity of the Sea before the temple) is about 22 liters.
264.172 gallons.