Quick conversions for the units you meet on bag labels and supplier quotes. All factors use exact definitions (1 ft = 0.3048 m; 1 US gal = 231 cubic inches).
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Area
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Volume
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Weight
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Handy reference
1 cubic yard = 27 cubic feet ≈ 0.765 m³
1 m³ = 1,000 liters ≈ 1.31 cubic yards
1 acre = 43,560 sq ft ≈ 4,047 m²
1 US gallon ≈ 3.785 liters; 1 cubic foot ≈ 7.48 US gallons
1 US ton = 2,000 lb; 1 metric tonne = 1,000 kg ≈ 2,205 lb