How it’s calculated
Density is mass per unit volume, converted through kg/m³. Each factor is a mass factor divided by a volume factor.
Example: water at 1,000 kg/m³ ÷ 16.018463 = 62.43 lb/ft³, or 8.345 lb per US gallon.
Specific gravity here uses 1,000 kg/m³ for water; pure water is about 999.97 kg/m³ at 4 °C and 998.2 kg/m³ at 20 °C.
Frequently asked questions
How do I convert kg/m³ to lb/ft³?
Divide by 16.018463 (or multiply by 0.062428). For example, concrete at 2,400 kg/m³ ≈ 149.8 lb/ft³.
What is the density of water in lb/ft³?
About 62.4 lb/ft³ (1,000 kg/m³), or about 8.34 lb per US gallon.
Is g/cm³ the same as g/mL?
Yes. A cubic centimeter is exactly one milliliter, so 1 g/cm³ = 1 g/mL = 1 kg/L.
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Sources
- NIST Guide to the SI, Appendix B: Conversion Factors (SP 811) — U.S. National Institute of Standards and Technology
- NIST Handbook 44, Appendix C: General Tables of Units of Measurement — U.S. National Institute of Standards and Technology
Formulas are taken from the free public references above. Results are provided “as is” for informational and educational purposes only. See our disclaimer.
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