Volume needed based on material

I need an calculator that calculate the amount of gravel needed on a surface in kg (ton) 1000 kg and price

Sort of gravel togheter with price ex. 0-15 mm = 50 kr, 9-15 mm = 55 kr and so on (I must be able to edit this later) where 1 unit equals 1 Ton (1000kg)
Length of surface
Width of surface
Height of surface
Sum: In kg
Price

And it needs to be translatable into Swedish.