Feb 13, 2013 How Much Crushed Stone Do I Need – Landscaping Ideas – Calculate the Amount of Crushed Stone Required by Your Patio. From Joe Norton. See About patios (L’xW’xH’) 27 = cubic yards of crushed stone needed detailed.Calculate 57 Limestone Gravel. Type in inches and feet of your project and calculate the estimated amount of Gravel Stone in cubic yards, cubic feet and Tons, that your need for your project. The Density of 57 Limestone Gravel 2,410 lb yd or 1.21 t yd or 0.8 yd t. A.