It's close, but not quite. 2 cups to 1 pint. 2 pints to one quart. 2 quarts to 1 gallon. But then there are the odd ones, like 3 feet to 1 yard, 3 teaspoons

It's close, but not quite. 2 cups to 1 pint. 2 pints to one quart. 2 quarts to 1 gallon. But then there are the odd ones, like 3 feet to 1 yard, 3 teaspoons to 1 tablespoon (2 tablespoons is 1 dessertspoon though). But there is quite a bit of doubling in the Imperial system.