The cost of sixteen 14-inch guns on King George V

How much larger would the King George V class need to be for four quadruple 14-inch turrets while retaining 28 knots and its protection?

The estimate is roughly 10,000 additional tons once guns, ammunition, armor, torpedo defence, machinery, crew, and stores are included.

The fourth quadruple turret adds much more than another set of guns. Its ammunition, armored volume, crew, stores, and structural support all increase displacement, while the ship still needs enough machinery to make 28 knots and enough underwater protection for the larger hull. The total increase is about 10,000 tons. The estimate demonstrates the compounding character of battleship weight growth.