This unit weight converter changes specific weight from pounds per cubic foot (lb/ft³) to kilonewtons per cubic meter (kN/m³), common in geotechnical and structural work. Enter a value above.
Formula
kN/m³ = lb/ft³ × 0.1571
Example
120 lb/ft³ = 120 × 0.1571 = 18.85 kN/m³.
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Frequently Asked Questions
How do I convert lb/ft3 to kN/m3?
Multiply pounds per cubic foot by 0.1571. So 120 lb/ft3 is about 18.85 kN/m3.
What is unit weight?
Unit weight, or specific weight, is the weight of a material per unit volume, used heavily in soil and concrete engineering.
Why convert to kN/m3?
Structural and geotechnical calculations use SI units, where unit weight is expressed in kilonewtons per cubic meter.