Convert Kilonewtons per Cubic Metre to lbf/ft³

Formula

lbf/ft³ = kN/m³ × 6.365880354264

Derivation from SI units:

• 1 kN/m³ = 1000 N/m³.
• 1 lbf/ft³ = 4.4482216152605 N ÷ 0.028316846592 m³ ≈ 157.087 N/m³.
• 1 kN/m³ = 1000 N/m³ ÷ 157.0874638462 N/m³ per lbf/ft³ = 6.365880354264 lbf/ft³

Both units are defined exactly, so the factor is exact. Kilonewton per Cubic Metre definition: kilonewton per cubic metre; Pound-force per Cubic Foot definition: pound-force per cubic foot.

Worked examples

1. A soil of 18 kN/m³ is 114.5858464 lbf/ft³.
   18 kN/m³ × 6.365880354 = 114.5858464 lbf/ft³
2. Plain concrete at 24 kN/m³ is 152.7811285 lbf/ft³.
   24 kN/m³ × 6.365880354 = 152.7811285 lbf/ft³

Where it's used

Unit weights in kN/m³ from SI and Indian codes are converted to pcf for US software and reports. Divide by 0.157087 (multiply by 6.366).

Kilonewton per Cubic Metre to other unit weight units

Frequently asked questions

Sources

• The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4 (derived units) and Table 8 (non-SI units accepted for use with the SI).
• Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "pound-force per cubic foot".

Last reviewed: 2026-10-15. Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.