Calculator The below calculator is to assist you in estimating your required quantity when ordering. Select which area are you measuring Rectangular Area Length (Metres) Width (Metres) Thickness (Centimetres) Total (Cubic Metres) Estimated material quantity Sand (Tonnes) Blue Metal (Tonnes) Natural Roadbase (Tonnes) Turf Underlay and Top Dressing (Tonnes) Circular Area Diameter of Circle (Metres) Thickness (Centimetres) Total (Cubic Metres) Estimated material quantity Sand (Tonnes) Blue Metal (Tonnes) Natural Roadbase (Tonnes) Turf Underlay and Top Dressing (Tonnes) Triangle Area Notes: 1) This assumes that two sides that meet at 90°. 2) Use those same two sides for Side A & B. Length of Side A (Metres) Length of Side B (Metres) Thickness (Centimetres) Total (Cubic Metres) Estimated material quantity Sand (Tonnes) Blue Metal (Tonnes) Natural Roadbase (Tonnes) Turf Underlay and Top Dressing (Tonnes)