A pipe has the shape of a cylinder; just use the formula for the volume of a cylinder. In metric units, you have the advantage that the units are consistent. For example, if the radius and height of the cylinder are measured in decimeters, the volume will be in cubic decimeters (= liters).
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1 metric ton = 1000 Kg It doesn't matter if it is dry sand, wet sand or anything else. A 'metric ton' is often just called a 'tonne', to distinguish it from the other two types of tons (British ton and US ton).
1 brass sand = 4.528 Metric tones (tonnes) That's because 1 brass = 100 cub ft sand. In metric, 1 cubic meter (cum) = 1600 Kg sand. 1 cubft = 0.0283 cum Therefore, 1 brass = 100 x 0.0283 x 1600 = 4528 Kg = 4.528 metric tones (or 'tonnes') That's for dry sand. If it has been raining or the sand is taken from a wet shore, this increases, on average, to 5.09 tonne.
just do length x width x height You could measure the length, width, and height of the box and multiply the three numbers. You could also fill the box to the level top with sand and pour that sand into a measuring cup to get a reasonably good fix on the volume. To be even more accurate you could pour that sand into a known volume of water and see how much of the water it displaces.
To convert the weight of the sand into a volume and find out how much you need you would need to know the density of the sand as the more dense it is the less sand there will be in a 50lb bag and the more bags you would then need to fill the yard
For this, you can work out the volume of the cylinder of sand you need to fill. But you'll also need to know the density of the sand to convert this volume into weight.