Weight Conversions Calculator
Convert units, estimate bags, and approximate bulk volumes
Convert Weight Units
Notes: cwt and ton are UK units (hundredweight and long ton).
All conversions
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Bags Required
This rounds up to whole bags. Actual usage depends on mix ratios, moisture, compaction and spillage.
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Volume & Bulk Bags (Approx.)
Densities vary significantly with moisture and compaction.
Treat these as planning numbers only. Supplier bulk bags are usually sold by volume (m3) or nominal weight, and can vary.
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Bulk Bag Estimator
Typical bag sizes: Mini Bulk Bag (250kg), Standard Bulk Bag (850kg), Jumbo Bulk Bag (1000kg), Large Bulk Bag (1500kg).
Click Calculate All Estimates above to view bulk bag recommendations.
References & Sources
Standards Cited
- NIST Handbook 44 — Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices
Provides authoritative conversion factors between US customary and metric weight units (e.g., 1 lb = 0.453592 kg) View → - ASCE 7-22 — ASCE 7 — Minimum Design Loads and Associated Criteria for Buildings and Other Structures
Source of standard material densities used for volume-to-weight conversions in North American construction
Formulas Used
- Weight Unit Conversion:
result = value x (fromFactor / toFactor)
Source: NIST Handbook 44 — Conversion via kilograms as the intermediate base unit - Bags Required:
bags = ceil(totalWeight x (1 + wastage%) / bagSize)
Source: Construction industry practice — Default 5% wastage allowance - Volume to Weight:
weight (kg) = volume (m³) x density (kg/m³)
Source: ASCE 7 / ACI 318 - Weight to Volume:
volume (m³) = weight (kg) / density (kg/m³)
Source: ASCE 7 / ACI 318
Key Assumptions
- Standard cement bag size of 94 lb (42.6 kg) per US industry standard — Portland Cement Association (PCA)
- Standard bulk bag (super sack) holds 2000 lb (907 kg) or 1 US short ton — Manufacturer industry standard
- Dry sand density of 100 pcf (1600 kg/m³) — ASCE 7 Table C3-1
- Dry cement density of 90 pcf (1440 kg/m³) — Portland Cement Association (PCA)
- Default 5% wastage allowance for bagged materials — Construction industry standard practice
- 1 US short ton = 907.185 kg = 2000 lb — NIST Handbook 44